SD-29 CIRCULA TING WA TER SYSTEM

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CAROLINA POWER & LIGHT COMPANYBRUNSWICK TRAINING SECTION

SYSTEM DESCRIPTION

SD-29

CIRCULA TING WA TER SYSTEM

REVISION 2

Subject Matter Expert .

Concurrence ByDate

Date

DateOps Traininq Suoervisor

SD-29 I - Rev. 2 of 85 |

REVISION SUMMARY

Revision 2 of SD-29 incorporates the following changes:

1. Incorporated changes from ESR 98-0096, Supervisory System; APP (1-UA-5)Window 2-1 from ESR 99-00359, Setpoints; ESR 99-00185 Level Glasses for CWWaterboxes.

LIST OF EFFECTIVE PAGES

1-85

Revision

2

| SD-29 I Rev. 2 . I . of 85

TABLE OF CONTENTS

SECTION PAGE

1.0 INTRODUCTION .................... . 71.1 System Purpose ............ .. 7

1.1.1 Tube Sheet Pressurization Subsystem ................................................ 71.1.2 Condenser Water Box Cathodic Protection Subsystem ....................... 71.1.3 AMERTAP Tube Cleaning Subsystem ................................................ 71.1.4 Condenser Water Box Air Removal Subsystem ................................... 8

1.2 System Design Basis ................................................... 81.2.1 Circulating Water System ................................................... 81.2.2 Circulating Water Intake and Discharge Canals ................................... 81.2.3 Circulating Water Intake Structure ................................................... 91.2.4 Turbine Building Internal Flooding Protection ....................................... 9

1.3 General System Description . ................................................. 101.3.1 Circulating Water System .................................................. 10

2.0 COMPONENT DESCRIPTION/DESIGN DATA ........................................... ; 102.1 Intake Canal and Intake Structure (Figure 29-6) . ......................................... 11

2.1.1 Circulating Water Intake Pumps (CWIPs) .122.1.2. Debris Filters (Figure 29-2) .................. 132.1.3 Condenser Water Boxes .132.1.4 Discharge Tunnel and Canal .142.1.5 Discharge Structure (Figure 29-8) .142.1.6 Circulating Water Ocean Discharge Pumps (CWODs) .15

2.2 Tubesheet Pressurization (TSP) Subsystem ..................... . 152.2.1 Instrumentation .162.2.2 Filters .172.2.3 Valves .172.2.4 Support Rack ................ 182.2.5 Local Annunciator Panel .18

2.3 Condenser Water Box Cathodic Protection Subsystem .............. . 182.3.1 Rectifier .202.3.2 Anodes .212.3.3 Terminal Boxes .212.3.4 Junction Boxes .212.3.5 Negative Connections .222.3.6 Reference Electrodes ................ , 222.3.7 Alternate Current Power .222.3.8 Direct Current Meters .22

2.4 AMERTAP Condenser Tube Cleaning Subsystem (Figure 29-3 and 29-4) ... 232.5 Condenser Water Box Air Removal Subsystem ............................................ 252.6 Turbine Building Condenser Pits .26

SD-29 - - Rev. 2 : Page3 of 85

TABLE OF CONTENTSSECTION PAGE

2.7 System and Component Design Parameters . ............................... 272.7.1 System Parameters .272.7.2 Component Design Parameters .272.7.3 Circulating Water Discharge Pump .282.7.4 Circulating Water Discharge Pump Motor .292.7.5 Circulating Water System Parameter .29

3.0 INSTRUMENTATION AND CONTROLS . . .293.1 Circulating Water System Control . . .293.2 Component Control . . . 30

3.2.1 Circulating Water Intake Pump Control .303.2.2 Condenser Isolation Valve Control .313.2.3 Circulating Water Ocean Discharge Pump Control .323.2.4 Circulating Water Discharge Pump Lube Water Pump Control . 333.2.5 Supervisory System .333.2.6 Debris Filter Backwashing (Figure 29-2) .363.2.7 Temperature Indications .373.2.8 Flow Minimization Schedule 38

3.3 Tube Sheet Pressurization Subsystem Control ............................................. 383.3.1 Control ................................................. 383.3.2 Instrumentation ................................................. 38

3.4 Cathodic Protection Subsystem ................................................. 393.4.1 Control ................................................. 393.4.2 Instrumentation ................................................. 393.4.3 Dual Light Alarm ................................................. 39

3.5 AMERTAP Condenser Tube Cleaning Subsystem Control . . 403.5.1 Manual Control ........................................ ......... 403.5.2 Automatic Control ................................................. 40

3.6 Condenser Water Box Air Removal Subsystem Control ............................... 403.6.1 Control ................................................. 403.6.2 Instrumentation ................................................. 41

3.7 Power Supplies ................................................. 423.8 Monitoring Instrumentation .............................................. 42

3.8.1 Instrumentation ................................................. 423.8.2 Annunciators ................................................. 433.8.3 Process Computer Interface .......................... ....................... 43

3.9 Instrument and Control Setpoints ......................................... 44

4.0 SYSTEM OPERATION ................................................. 454.1 Normal Operational Relationships ....................... .......................... 454.2 Abnormal Operation ................................................. 464.3 Interrelationships With Other Systems .50

SD-29 Rev. 2 - of 85 |

TABLE OF CONTENTSSECTION PAGE

5.0 RELATED INDUSTRY EVENTS .......................... 515.1 PS 3923, Manual Reactor Scram Due to Loss of Condenser Vacuum

During Unit Startup .515.2 OE 2846, Circ Water Pump Trip Event .515.3 SER 7-96, Condenser Tube Failure .525.4 SER 8-96, Icing of Traveling Screens and Trash Racks .525.5 SOER 85-5, Internal Flooding of Power Plant Buildings .535.6 CR 99-01661, Low Vacuum Trip Due to Fouling of Traveling Screens . 53

6.0 REFERENCES ............. 546.1 Technical Specifications.s 546.2 Updated Final Safety Analysis Report .546.3 Piping & Instrumentation Drawings ....................... 556.4 Control Wiring Diagrams .586.5 Modification Packages .596.6 Procedures .596.7 Miscellaneous .61

7.0 TABLES ........ 61

29-1 National Pollutant Discharge Elimination System Restrictions forCirculating Water System Operation .62

29-2 Power Supplies .63

29-3.1 Monitoring Instrumentation ....................... 65

29-3.2 Supervisory System Monitoring .68

29-4 Annunciators .69

29-5 Instrument and Control Setpoints .70

FIGURES

29-1 Circulating Water System (Unit 2) .75

29-2 Debris Filter Cross Section .76

29-3 AMERTAP System Cross Section .77

29-4 AMERTAP System (Unit 2) .78

SD-29 I Rev. 2 - of 85 .

SECTION

FIGURES

29-5

29-6

29-7

29-8

29-9

29-10

29-11

TABLE OF CONTENTSPAGE

AMERTAP Ball Collection Strainer ...................................... .79

Intake Canal General Arrangement .......... ............................ 80

Discharge Canal General Arrangement ...................................... 81

Caswell Beach Pumping Station Layout ............. ......................... 82

Caswell Beach Pumping Station CWOD Pump Detail .............................. 83

CWIP Characteristic Pump Curve ..................................... 84

CWOD Pump Characteristic Pump Curve .............................. ; ; 85

SD-29 - Rev. 2- - of 85

1.0 INTRODUCTION

1.1 System Purpose

The purpose of the Circulating Water System is to provide the heat sinknecessary to remove the latent heat of condensation from the low pressureturbines exhaust steam and to cool this condensate sufficiently to preventcavitation in the condensate system, thus maintaining the vacuum requiredfor operation. The system also provides dilution flow necessary foracceptable radioactive liquid effluent release concentrations.

1.1.1 Tube Sheet Pressurization Subsystem

The purpose of the Tube Sheet Pressurization (TSP) Subsystem is to provide anuninterrupted supply of condensate quality water to the -integrally-grooved tube sheet (IGTS) cavity at approximately 15 psiabove condenser water box pressure at all times during condenserand/or Circulating Water System operation. In addition, the systemwill monitor leakage and provide a method to determine the locationand rate of leaks.

1.1.2 Condenser Water Box Cathodic Protection Subsystem

The purpose of the Condenser Water Box Cathodic Protection Subsystem is to providecorrosion protection to each condenser water box and tube sheet.The system impresses electrical direct current to the metallicstructure in sufficient quantity to counteract the effects of galvaniccorrosion.

m

LI 0 ani T e CieanngSubsystem s to providecont s condenser tubes to maximizeheattrAnsfer~ efficiency.

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mprroressar 4 bt jscriotionS1Fo m aei ½ftbvXs- --%..,,S.*: r:,jp,~ ion

S-9 -|Rev. 2 of 85 |

1.1 .4 Condenser Water Box Air Removal Subsystem

The purpose of the condenser water box air removal subsystem is to establish andmaintain prime on the circulating water system at the main condenserwater boxes. Local level indications for each inlet side condenserwater box are provided for operator reference. Portions of thissubsystem are common to both Units 1 and 2.

1.2 System Design Basis

1.2.1 Circulating Water System

The design basis of the condenser circulating water system are as follows:

flogMo main co n en y 10 mremo e eat

2. T p ek praely atMr ntion resulting from theM x~riane.

3. The head developed by the pumps can overcome the system frictionand provide the static lift required by the syphon seal.

4. The pumps are rated to permit operation of Unit 2 turbine-generatorat full 105 percent steam dump conditions without a trip.

5. Complete outage of the condenser circulating water system will notresult in loss of any service essential to reactor safety. Therefore, thecondenser circulating water system pumps and valves are designedto Seismic Class II requirements.

1.2.2 Circulating Water Intake and Discharge Canals

ap 11tir*ows -,Marsh-area anddia WU200th offshore.

_6 ft/sec andIn, ,tihe~x,œsmarg~er'canawp,, ~ate,~sfc.

SD-29 I Rev. 2 of 85

2. qWpe-requirement ofMe9Onp, ` IfIt; however,

the -;l ael- eQtreakevcana14s--appmoximatelyb c Tunits in

of f s . The hydraulic gradient forthe Circulating Water System is shown on drawing F-2019.

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9 r, eismnia.

1.2.3 Circulating Water Intake Structure

1. The circulating water intake structure was designed to meet seismicClass II criteria and soil pressure loadings.

2. The walls between the pump bays were designed to allow dewateringone bay. The discharge chambers were designed for normal loadingplus internal water pressure. The safety factors for the circulatingwater intake structure against overturning, flotation, and sliding weredetermined using Class I loading criteria because of its closeproximity to the Class I service water intake structure. This designwill assure that the circulating water intake structure will not affect thestability of the service water intake structure.

1.2.4 Turbine Building Internal Flooding Protection

1. Flood level alarms in the circulation water condenser pits warn theoperator that an abnormal condition exists and that water is enteringthe pit. Also, a set of three level alarms (one in each pit) installed108 inches above the pit floors will, when activated, automaticallyshut off the circulating water intake pumps if a confirmed level of60 inches has already been received for the affected pit.

SD-29 Rev. 2 | - of 85

1.3 General System Description

1.3.1 Circulating Water System (Figure 29-1)

WII c= MaintakeSty _ iser

rs-cl = i a ij r u p ture,-H I=r .Ming. Only the

intake canal, intake structure, portions of the condenser water box airremoval subsystem, discharge canal, and discharge structure arecommon to both units.

2.0 COMPONENT DESCRIPTION/DESIGN DATA

__ - a 6wearRiverture.ture 4arnlike,st ructure). is located at

thle gh1I e'canaIm 7 iare a ili eaf4hef1avoeli-g'screens,at e *1take pumps. Ailed

j ther u e -_s twti~riEea=ems~at themqu make. The turtle blocker panels will allow for maintenance on thestructure screen as well as prevent turtles from entering the intake canal. Thefour circulating water intake pumps for each unit take suction on the intakestructure pump bays behind the traveling screens and discharge through thepump discharge valves into the unit's diverting zone. The diverting zone is acommon mixing zone which enables any combination of the four pumps to beused.

is Q nle-JbA -§hzones (2 per unit). T~Pe-citing4T61 R # fi ii o miaer -" -f ~haaders Land h~eade

w .. aiso~ation valves tothAjjilldie iandn1.etbra b waterboxespTiolronentering the.

ce~bs

SD-29 Rev. 2 of 85 |

NOTE: _ m 9 6", te96

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NOTE: Since the installation of the AMERTAP condenser tube cleaningsystem, the backwash zone is no longer used for condenser backwashing. Thezone discharge valves are disabled.

WOM Vp I a0s aTi is a

q ftgwssystemianT- a #1. _iency

ri& -- xejjjg~gter transitsthey =sisc d A ndenser outletvalve weir. DR6whseam of theu t r 7 taatthrouh non pipes

Circulating water discharge pumps located at the Caswell Beach pumping stationtake a suction on the stilling basin and pump the water 2000 ft. beyond theshoreline and release it to the Atlantic Ocean. There are two ocean dischargepipes, one for Unit 1's circulating water discharge pumps and the other forUnit 2's.

The system is filled after maintenance by conventional service water.

2.1 Intake Canal and Intake Structure (Figure 29-6)

The jnf8g< nsia. Thee nra -IVWsWeW iftfadiVe rsidfsvfustu re preventing .th ep'sage oflai,,gc1brisfifsnd fish. The pani1i §½U~a-di tn 6' of t2 S 7ti: 6fi ji6fhwestto itheirfland. Froth etawhestadthreiVe anthV-sou s ttfdrrninatingfi'at'ir'the'intake structure. 1leT TnT 6eaie isI i i d toa c bh i q6qF pfI fqirem csfsperu 1it tebpect tominimum >inh imum tide.t nditions.

SD-29 Rev.2 - of 85l

floc eb n ae eus sh racksarans int1an e T _ neof the

sapy. When necessary, these racks may be removed by the in-placecrane for cleaning.

Th 'al l g thesystem. Th rb h fine

my Uav, ntrainedsers. e traveling screens are a f eq pe Ith fish

: mWm b g __o1 r fish

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P The traveling screens aretechnically part of the Screenwash System and are described in furtherdetail in OSD-29.1.

The Circulating Water Intake Traveling Screens are powered as follows:

1(2) A,B,C & D: 480 VAC 1(2)SA

The circulating water intake pumps are also mounted on the intake structure.

2.1.1 Circulating Water Intake Pumps (CWIPs)

The Circulating Water System has four vertical centrifugal, mixed flow, CWIPs per unit.The pumps are arranged in parallel, each taking suction from itsrespective pump bay through a traveling screen. The conventionalservice water header provides lubricating water to the pumps through1 (2)SW-V36 and 37, individual strainers and cyclone separators. TheCWIP induction type motors are equipped with integral bearing oilcoolers.

SD-29 I Rev. 2 I of 85

The CWIPs are powered as follows:

1(2) A and C: 4160 kV Bus 1(2)C

1(2)BandD: 4160kVBus1(2)D

Characteristic pump curves for the CWIPs are included as Figure 29-10.

In addition, four Unit 1 vacuum relief valves and four Unit 2 vacuum relief valves areinstalled on the piping adjacent to the Circulating Water pumps.These valves serve to break the vacuum developed in the headerbetween the pumps and the condenser waterboxes in the event of asimultaneous trip of all circulating water pumps, eliminating thepossibility of water hammer.

2.1.2 Debris Filters (Figure 29-2)

sls er. Each debris filter consists of a rubber-linedcarbon steelody and a cylindrical, perforated stainless steel screen.Circulating water enters the filter radially and passes through thecylindrical screen. The water makes a 90o directional change andexits the filter assembly leaving debris on the outside of the cylindricalscreen. The debris filters have differential pressure indication on theControl Room XU-2 panel, and locally adjacent to the TSP panel onTurbine Building 20' elevation.

The debris filters are backwashed on line as described in Section 3.2.6.

2.1.3 Condenser Water Boxes

. The Tubesheet pressuriatioh Subsystem and the CondenserWater Box Cathodic Protection Subsystem are described in detail inSections 2.2. and 2.3 respectively. T ereae lotalof.eightwaterboxesperijtiwoinIitand o$nst 1 e _ss--

SD-29 I Rev. 2 of 85|

- The elevation of the upper tubes in the main condenser is higher than the full flowsystem head of the CWIPs. In the past the circulating water systemhas been operated with the inlet water boxes vented and thecondenser outlet valves throttled to maintain the condensers as fullas possible. When operating with the mode selector switch in the Cand D positions (condenser outlet valves throttled positions 34% and85% open respectively) air binding has been experienced adverselyaffecting overall plant operation. A Condenser Water Box AirRemoval Subsystem establishes and maintains a prime at the highpoint of the circulating water system. This subsystem is described indetail in Section 2.5. To protect against condenser tube leaks fromsteam or debris impingement, the top three rows of condenser tubesin each inlet and outlet water box have been permanently plugged.

2.1.4 Discharge Tunnel and Canal (Figure 29-7)

* w~Ts6'air. T e ai~=X~',t,.Jng. To=

Thaa _ t

2.1.5 Discharge Structure (Figure 29-8)

The dih ru ml 1 tructure. Larg e Iiered byverti_, f the structure.Traveling ltering of thewak ~~? ~ din theda e eightci rc rt ur re.

I SD-29 I Rev. 2 1 of 85|

2.1.6 Circulating Water Ocean Discharge Pumps (CWODs)(Figure 29-9)

_S_< todisam fl u e n et. Th On from

diluti 4 _ aal

The CWOD Pumps are water cooled and lubricated. Cooling and lubrication water aresupplied by two bearing lube water pumps per unit, each takingsuction from the bay area via a suction strainer. The pumpsdischarge the water to the CWOD Pumps for cooling and lubrication.

Backwashing is performed to flush the lube water suction strainers and the CWODPumps motor cooling coils. Caution must be taken during thesebackwashes to slowly open the drain valves. Rapid opening of thevalves can cause a low lube water pressure to be sensed and trippingof the CWOD may follow.

The CWOD Pumps are powered as follows:

1(2) A and B: Caswell Beach 4 kV Bus B

1(2) C and D: Caswell Beach 4 kV Bus A

Characteristic pump curves for the CWOD Pumps are included as Figure 29-1 1.

2.2 Tubesheet Pressurization (TSP) Subsystem

The purpose of the TSP subsystem is to provide indication of a tube to tubesheet leakon either side of the tubesheet and to ensure that leakage to the condenserside is clean demineralized water verses circulating water. The TSPsubsystem provides demineralized water at a controlled pressure of 10 to 25psig above water box pressure and at a monitored flow rate to the spacebetween the tubesheets called the Integrally Grooved Tubesheet (IGTS)cavity. The connection to the Demineralized Water System is fitted with anisolation valve and double check valve to prevent reverse flow. There is anauxiliary connection provided with plant air for testing or emergencypressurization if demineralized water is unavailable. The design pressure is150 psig up to the connection to the tubesheet. The IGTS cavity designpressure is 45 psig. Each unit has an independent TSP subsystem.

SD-29 | Rev. 2 of 85|

Redundant filters ensure that adequate water quality is maintained at the IGTS cavity toprevent clogging. Redundant pressure-reducing valves regulate thepressure to 35 psig, which will maintain a 10 to 25 psi differential above thewater box pressure. A PRV bleed-off control valve is provided to maintaindesired downstream pressure-reducing valve pressure during periods of noor low flow. The bleed-off discharge is direct to the Equipment DrainSystem.

Two flow switches monitor the flow to the inlet and outlet tubesheets and provide analarm at the local control panels when the maximum permissible flow rate of1 GPM is exceeded. Demineralized water supply low pressure or filter highD/P will also alarm at the local panels. A common annunciator will alarm inthe Control Room for any of these conditions.

Each tubesheet supply line contains individual flowmeters which can be valved intoservice to identify the leaking tubesheet. The flow meters are normallybypassed during operation.

Each supply line is connected to the corresponding tube-sheet in four places and isfitted with a pressure-relief valve. Each tubesheet is fitted with four cappedvent lines.

The system, as described, is mounted on a support rack located directly west of thecondensate pump pit in Units 1 and 2 at elevation 20'. The rack providesconnection points for the Demineralized Water System, the eight supplylines to the tube sheets, and electrical and alarm wiring to adjacent electricalpanels. In addition, the necessary isolation valve, check valves, gauges,electrical control cabinet, and nameplates are mounted on the support rack.

2.2.1 Instrumentation

The arrangement and installation of all equipment are shown on Drawing F-7358.

1. The pressure indicating gauges are Bourdon tube type.

2. The pressure differential switches (PDS) measure the pressure dropacross the filters. The PDS is a diaphragm type with watertighthousing, an adjustable differential range of 3.0 to 40 psig, and amaximum working pressure of 150 psig. At normal operation(approximately zero flow), there will be no differential pressure. ThePDS alarm contact will be set to open when the differential exceeds15 psid to activate the alarm.

SD-29 Rev. 2 of 85

- 3. The pressure switch is located after the pressure-reducing valves todetect inadequate pressure supplied to the tube sheets. The switchis a diaphragm type with water-tight housing and dual settings. Theswitch has an adjustable range of 0.5 to 80 psi and maximum testpressure of 160 psig. At normal operation, the pressure will beapproximately 35 psig. The switch will be set so that the alarmcontact will open when the pressure drops below 20 psig to activatethe alarm.

4. Eight flow gauges, one on each branch to a tube sheet, detect theleakage rate for that tube sheet. The gauges are glass tuberotameters with a flow range of 0 to 1.4 gpm water, and 2% accuracy.

5. Two flow meters with alarm switch components, one on the inlet tubesheet branch and one on the outlet tube sheet branch, constantlymonitor for flow to detect the total leakage rate for each set of fourtube sheets and actuate an alarm when the maximum permissibleleak rate is exceeded. The flow meter components are glass tuberotameters with an adjustable alarm contact with a flow range of 0 to8.4 gpm water, and 2% accuracy. At normal operation, there will notbe any leakage or flow. The switch will be set so that the alarmcontact will open when the leak rate exceeds 1 gpm to activate thealarm.

2.2.2 Filters

Redundant filters are provided to ensure a clean supply of demineralized water to thesucceeding instrumentation and the tube sheets. The filters arecanister shells with replaceable, 20 micron cotton filter cartridges witha flow range of 4-20 gpm, and maximum operating pressure of 150psig.

2.2.3 Valves

1 . Redundant pressure-reducing valves (PRV) are used to reduce theincoming demineralized water pressure to approximately 35 psig.The PRVs are diaphragm-operated type with a stainless steeldiaphragm and an adjustable outlet pressure range of 0 to 50 psig. Ableed-off control valve (V-1 0) is provided to maintain desireddownstream pressure-reducing valve pressure during no or low flowcondition.

2. Ball valves are used throughout the system for shut-off service.

SD-29 Rev. 2 of 85

-- . 3. - Two check valves are installed in the inlet line to ensure-against backflow to the Demineralized Water System. In addition, one checkvalve is located in each supply line to the tube sheets.

4. Pressure-relief valves to prevent overpressurization of IGTS cavitywill be preset at 50 psig (± 5 psig).

2.2.4 Support Rack

The support rack is a welded, structural steel frame designed and constructed formounting the components and control valves of the TSP System.Rack dimensions are approximately 10' high by 9' wide.

2.2.5 Local Annunciator Panel

The local annunciator panel is a 30" x 24" x 10" NEMA-12 electrical enclosure mountedon the wall near the support rack. This panel houses the alarm pushbuttons, alarm indicating lights, power indicting light, and thenecessary electrical equipment. The panel displays one whiteindicating light to show when the electrical power is on and five redindicating lights with reset buttons to show which of the monitorswitches are alarming and to provide reset capability. An alarm at thelocal panel will activate an annunciator on UA-24 in the ControlRoom.

2.3 Condenser Water Box Cathodic Protection Subsystem

The Condenser Water Box Cathodic Protection provides corrosion protection to eachcondenser water box and tubesheet. Cathodic Protection impresseselectrical direct current to the metallic structure in sufficient quantity tocounteract effects of galvanic corrosion.

SD-29 Rev. 2 of 85

; A potential difference will usually exist between two dissimilar-metals when they are-immersed in a corrosive or conductive solution (electrolyte). If these metalsare placed in contact (or otherwise electrically connected), this potentialdifference produces electron flow between them. Corrosion rate of the lesscorrosion-resistant metal is usually increased and attack of the moreresistant material is decreased, as compared with the behavior of thesemetals when they are not in contact. The less resistant metal becomesanodic and the more resistant metal cathodic. Usually the cathode orcathodic metal corrodes very little or not at all in this type of coupling.Because of the electric currents and dissimilar metals involved, this form ofcorrosion is called galvanic, or two-metal corrosion. The driving force forcurrent and corrosion is the potential developed between the two metals.

In the case of the condenser water boxes the conditions for this type of corrosion exist.The electrolyte is the circulating water itself while the dissimilar metals arethe water box (carbon steel) and the tubesheets (aluminum bronze).

Several methods are available to reduce galvanic corrosion. The one used in thecirculating water system is cathodic protection. A third dissimilar metal(niobium rod coated with platinum) is placed in the circulating water in thecondenser water boxes. A positive potential is applied to this anode, forcinga current through the circulating water to the water box and to thetubesheets. Now both of the metals we would like to protect are cathodicand corrode very little.

The anode used is referred to as an impressed-current anode. It has the ability ofreleasing electrons to the electrolyte while undergoing very little corrosion(loss of material).

The chemical reactions which form on the surfaces of the water boxes and tubesheets(cathodic metals) provide a barrier between these surfaces and theirenvironment. This can actually be considered a coating; i.e., a coating thatcan be continually replenished. This barrier can be measured with the useof a voltmeter and a reference electrode placed close to the coated surface.This measurement is called a structure-to-electrolyte potential. A voltageshift or change in potential from the native static potential is required forcathodic protection to be complete.

To establish the potential required between the anode and the water box and tubesheeta direct current (DC) source is required. In the condenser water boxcathodic protection system AC to DC rectifier units are used.

SD-29 Rev. 2 of 85

- A total of eight cathodic protection subsystems are provided for each Unit's condenserat BNP. Each subsystem includes one rectifier, five anodes, four referenceelectrodes, one terminal box, and one junction box. These subsystems areprovided to supply cathodic protection current to the eight condenser waterboxes (four inlet and four outlet) which are part of the condenser system foreach unit.

The eight cathodic protection subsystems are divided into two groups, one for the Ashells and the other for the B shells. The four rectifiers for each group arehoused in a single cabinet located in the breezeway beyond the condenserbay shield wall.

2.3.1 Rectifier

The rectifier has a 3 phase Delta/Wye transformer suitable for 480 Vac input. Directcurrent output is rated at 30 volts, 40 amps. The unit is air-cooledwith silicon controlled stack elements. Transformer control isstepless with a continuous adjustment from zero to rated output usinga small potentiometer. Output can be adjusted manually with thepotentiometer or automatically with the use of the potential controlledautomatic circuit (APC circuit). The unit will normally be operated onautomatic control with the use of a reference electrode lead and astructure (ground) lead tied into the potential controlling circuit.

The rectifier unit is electronically protected against damage due to external shortcircuits. By this, it is meant that the unit will operate indefinitely undershort circuit conditions without exceeding its set output rating.Additionally, the unit has a filtered output for increased conversionefficiency and reduced electrical interference and AC input DC outputlightning arrestors.

A dual light alarm is provided to indicate normal operation (red light on, amber light off),shutdown or loss of AC input power (no lights), and lack of adequateoutput dc/impressed potential (amber light on, red light off). This lightalarm system is tied into the annunciator alarm system in the ControlRoom. The Control Room annunciator will sound on loss of AC inputand/or lack of adequate output dc/impressed potential. An alarmcutoff switch is provided inside the rectifier unit so that the ControlRoom annunciator may be bypassed.

I SD-29 I Rev. 2 I of 85 1

2.3.2 Anodes

Each water box enclosure is provided with five anodes(a total of 40 anodes for bothcondenser shells). The anodes penetrate through the water boxenclosure with the aid of the opening provided and a flangeassembly. The anode element is a /2" diameter x 9" long niobium rodwith a 200 microinch coating of platinum. A 9" long fiberglassstandoff shield is provided up to the mounting assembly. Themounting assembly has a 1/2" NPT strain relief cable gland to provideaccess for the anode cable connection. There is a brass screw fittinginside the anode head for this connection. The cable connectionextends from the anode, through conduit, to a terminal box located onthe water box.

2.3.3 Terminal Boxes

A terminal box is provided on each water box enclosure (a total of eight terminal boxesfor both condenser shells). These terminal boxes are provided toeasily disconnect the anode, electrodes, and structure connectionswhen the water box is removed. The terminal box is a NEMA Type 4enclosure. A terminal block is provided within to accommodatefive anode leads, four reference electrode leads, and one structurelead. This structure lead is provided for the automatic controller atthe rectifier.

2.3.4 Junction Boxes

A junction box is provided for each cathodic protection system (a total of eight junctionboxes for both condenser shells). Each junction box (in groups offour) is located on a panel board which is adjacent to their respectiverectifier cabinet. This junction box serves as a termination point forthe five anode leads and four reference electrode leads from eachwater box. The automatic circuit structure lead is also routed throughthis box. The five anode leads are fused and shunted through thisbox and terminated on to a common bus bar. A new positive anodelead is routed from this bus bar to the positive (anode) DC lead at therectifier.

The four reference electrodes are terminated to a selector switch. The selector switchterminal and structure terminal is metered using a 0 to 1.5 voltmeterand again terminated on the opposite side of the circuit. The selectedreference electrode lead and structure lead is then routed from thejunction box to the rectifier control circuit (control card located withinthe rectifier).

SD-29 Rev. 2 of 85

2.3.5 Negative Connections

A 1 0/AWG DC cable is routed from each condenser (cable is cadwelded to thecondenser shell except for the 2A North inlet which is lugged andbolted in place) to the common negative terminal of the rectifiercabinet. Four negative cables are then provided from this terminal tothe negative output terminals of each rectifier. This cable is notrouted through the junction box. This connection completes the DCcircuit.

2.3.6 Reference Electrodes

Each water box enclosure is provided with four reference electrodes (a total of 32electrodes for both condenser shells). The electrodes penetratethrough the water box enclosure with the aid of the opening providedand a flange assembly. The electrode element is a 3/8" diameter x 1"long zinc rod. A 10" long fiberglass standoff shield is provided up tothe mounting assembly. The mounting assembly has a 1/2" NPTstrain relief cable gland to provide access for the electrode head forthis connection. The cable connection extends from the electrode,through conduit, to a terminal box located on the water box.

2.3.7 Alternate Current Power

There is a common 480 Vac (3-phase) input terminal within the rectifier cabinet. Thereis a fused disconnect switch at this terminal. Alternating currentpower connections to each rectifier are prewired from this point.Each rectifier unit within the cabinet is provided with input circuitbreakers.

2.3.8 Direct Current Meters

Each rectifier front panel is provided with three DC meters. The top meter is areference potential meter which is measuring the difference inpotential between the selected zinc reference electrode and the waterbox structure. This meter also measures the selected or set potentialbetween the above. This set potential is selected in the field whenplacing the cathodic protection system on line. A switch is providedon the auto-volt control card to select either the "set" or "ref" potentialread. When the system is on auto-volt control the "ref potential"should be the same as the "set potential" if the system is operatingand controlling properly.

SD-29 Rev. 2 of 85

The center meter is the DC voltmeter. This is the total voltage attributed to the DC,circuit and includes the anode-to-electrolyte, electrolyte,electrolyte-to-cathode, and metallic circuit IR drops.

The bottom meter is the DC ammeter. This measures the total current flow through theDC circuit.

There is also a potential meter inside each junction box. This meter is essentiallyidentical to the first meter described above. This meter is capable ofmeasuring all four reference electrodes with the aid of a selectorswitch. This meter reads ref potential only. It does not read the setpotential. The reference electrode to be used as the controllingelectrode will be determined when placing the system on line.

2.4 )

NOTE: T 1Unit 2 ball collection strainers have been abandoned in place per ESR 97-00576.

IFOR* -~u~wrra~-iiI MMi I Mr. UUIUU I iser r

_M___ aininga

C ' A~ p . n a n a . , s . H - k - A . , k n .~ i .- a .I ^ ; _ _ i - .^. .-;a I . n 4 i i n r

%a - _~ Y~ Iq rnIaeUliy II I lsUllIyUI I typ

of P. The following list provides ad specifies the proper use of each type.

1. 26 millimeter (soft texture, open-cell surface, blue in color), used fornormal operation the majority of the year (April through November),when Circ. Water flow is restricted to 1105 cfs.

2. 25 millimeter (soft texture, open-cell surface, orange in color), usedfor cold water operation during the months of December throughMarch, when Circ. Water flow is restricted to 922 cfs.

I SD-29 .I Rev. 2 of 85 1 'I SD - 9ev 2Pa e 2 of 8

3.- 26 millimeter (hard texture, smooth surface, blue in color), used forhigh flow operation during the months of July through September,when Circ. Water flow restrictions allow four (4) pump operation.

4. 24 millimeter (abrasive band), used after extended shutdowns orextended periods when AMERTAP System is out of service. The CWSystem Engineer should be contacted prior to introduction of theseabrasive balls to the system. This ball should only circulate for a fewdays and then be changed out for the type ball used normally for thattime of year.

5. The first two types of balls are interchangeable if the required typebecomes unavailable.

Th rouglheapeuseglb .__1P hl Hi Abs. Ea ws ser

con~'i~,6s bth of it's water

btballsrti1aI spms and a

AME _ a _ane& and routed tot e collector unit by the recirculaboripwips.IThe.ba .co titffrer,

located in- Tscreens, twoltrianrrs areabandoned in place on Unit 2).

The upper screens funnel the balls to the lower screens which, in turn, direct the ballsto the ball recirculating pump suction piping. Due to a high flow rate throughthe strainer, a small quantity of balls are trapped against the lower screens.As the balls pass to the lower screens, they are accelerated by the upperscreen hydrofoil section. The acceleration of the balls aids to minimize thenumber of balls trapped. Operations of the throttle flap to reduce flowthrough the strainer also aids in minimizing the number of balls trapped.During ball collection, the shut-off flap is utilized to backwash the lowerscreens which frees any trapped balls.

The collector unit consists of ball recirculating pump and a vertical collector cylinder.The recirculating pump is a centrifugal pump with an impeller designed tocompress the individual balls. Due to this compression, the air trappedwithin the balls is released. The recirculating pump receives the balls fromthe ball collecting strainer and provides the necessary driving head to directthe balls through the collector cylinder to the injection nozzles.

SD-29 Rev. 2 of 85

- The collector cylinder is equipped with a viewing window to verify flow and to provide ameans of visually inspecting the balls during system operation. The cylinderis also equipped with a ball collecting flap. During ball collection, the flap isadjusted to block the collector cylinder ball discharge.

At the collector unit, the cycles can be interrupted at any time to count balls, check ballsizes, or take the balls out of service. Size reduction, due to the wear, willrequire ball replacement. This is also accomplished at the collector unit.

From the collector unit, the balls are routed to the injection nozzles via a ball distributor.On Unit 1 only, the ball distributor is manually positioned to direct the ballsto either or both of the condenser shell inlet water boxes. On Unit 2 balldistributor position vanes have been removed by ESRs 97-00219 and 97-00247. The balls travel on to the injection piping. Upon entering thecondenser, the balls travel the length of the tubes utilizing the pressuredifferential between the tube inlets and outlets as the driving force. Aminimum pressure differential of 4.2 ft. of water is required for propersystem operation.

2.5 Condenser Water Box Air Removal Subsystem

A Condenser Water Box Air Removal Subsystem establishes and maintains a prime atthe high point of the circulating water system. This system consist of apriming tank and two vacuum pumps. This equipment is centrally locatedbetween Unit 1 and 2 main turbine generators at the 70' elevation of theturbine building. The system is tied into the air removal headers for thewater boxes of both unit's condensers thus providing a common vacuumsource and system to both BNP units.

When the circulating water system is first started up, the inlet water boxes are vented toatmosphere through a vent line which is part of the water box air removalsystem. If the system is to be operated with the mode selector switch in theC or D positions the water box removal system must be started. It is optionalas to whether or not the system is operated when the mode selector switchis in the B position. The vent path for the inlet water boxes is secured andboth the inlet and outlet water boxes are aligned to the air removal system.The vacuum pumps are started by selecting pump 2A or 2B with the lead/lagselector switch. The pump that is selected as the lead pump is then startedby placing its control switch in the AUTO position. Once the lead pump isrunning the control switch for the pump selected as the lag pump is placedin AUTO.

SD-29 Rev. 2 | of 85

When the Vacuum Priming Tank is less than 18" Hg, the Lead Air Removal Pump startsand runs until about 24" Hg vacuum is obtained. When the Priming Tank isless than 12" Hg the Lag Air Removal Pump will Auto start and run until 18"is obtained.

A water box level indication system with instruments is located in the turbine buildingoutside of the condenser bay in the vicinity of the condensate pumps. Eachgauge indicates in feet of water with a range of 0 - 40 ft. 40 ft equalselevation 62' - 4" or 23.83 ft above the water box in the air removal line.

Each inlet and outlet water box has a valved connection to the respective inlet or outletair removal header. Each valve at a water box is equipped with a debrisscreen to assist in prevention of drawing AMERTAP balls into the AirRemoval Subsystem.

2.6 Turbine Building Condenser Pits

There are three Turbine Building Condenser Pits, two on the outlet end of thecondenser (Northwest and Southwest) and one on the inlet end of thecondenser (East). The outlet end pits are automatically pumped to the inletend pit by electric driven sump pumps. There is a manually controlled inletpit electric sump pump to the salt water release tank. Radwaste should benotified any time this pumping is initiated to ensure there is sufficient room inthe salt water release tank. The amount to be transferred can be calculatedby multiplying the inches to be pumped times the gallons per inch given inthe Operating Procedure (1495 gaVinch). The air driven sump pumps havea capacity of approximately 50 gpm. The time to pump a sump can becalculated dividing the pump capacity into the volume to be pumped.

Each Turbine Building condenser pit has three level detectors. One initiates anannunciator in the Control Room if level should reach 10". The secondinitiates an Hi level light on the Flooding Status Panel at 60". The thirdinitiates a Hi Hi level light on the Flooding Status Panel at 108". The 108"'switch confirmed by the 60" switch will trip all of the operating CWIPs on theaffected unit.

I SD-29 I Rev. 2 | of 85 |

2.7 System and Component Design Paramet

2.7.1 System Parameters

Seasonal water temperaturevariations

* u n it

2.7.2 Component Design Parameters

1. Circulating Water Intake Pump

Design head (TDH)

Shutoff head

Minimum submergence

Design speed

Critical speed

Efficiency at normal load

Power consumptiona. Design load

b. Shutoff

Maximum time pump can operateat low water level

Bearing cooling watera. Quantity

b. Pressure

ers

400F to 900F

41.89 ft.

98 ft.

10ft.

360 rpm

1385 rpm

87%

1955 hp3750 hp

continuous

7gpm20 psig

SD-29 - Rev. 2 of 85

2. Circulating Water Intake Pump Motor

Make

Type

Rated horsepower

Speed

Voltage

Phases

Rated load

Design head

Shutoff head

Minimum submergence

Design speed

Critical speed

Efficiency at normalload

Power Consumptiona. Design loadb. Maximum

Minimum time pump canoperate at extreme lowwater level

Bearing cooling watera. Quantity

b. Pressure

Electric Machinery

Induction

2500 hp

360 rpm

4000 Vac

3

349 amperes

Pump

1 1.6 ft.

43ft.

9ft.

277 rpm

800 rpm

82%

612 hp690 hp (at high tide)

continuous

6 gpm15 to 20 psig

| SD-29 I Rev. 2 - I - of 85 |

2.7.4 Circulating Water Discharge Pump Motor

Make Electric Products

SynchronousType

Rated horsepower 800 hp

Speed 277 rpm

Voltage 4000 Vac

Phases 3

Rated load 91 amperes

Seasonal water temperature variations 400F min to 800F

N o _3P * u n - Thit

3.0 INSTRUMENTATION AND CONTROLS

3.1 Circulating Water System Control

Various startup control functions associated with the operation of the Circulating WaterSystem are operator initiated. Automatic shutdown functions are providedfor equipment protection. System interlocks are provided for pumpprotection and system integrity.

During normal operation, the system is remotely controlled from the RTGB, XU-2 Panel,in the main Control Room. The Caswell Beach Pumping Station has a localcontrol system in addition to the remote.

ISD-29 I Rev. 2 | Page29 of 85

3.2 Component Control

3.2.1 Circulating Water Intake Pump Control

Prior to CWIP startup for either unit, the valve train mode selector switch CW-CS-1 014must be selected to the "D" position. The purpose of the modeselector switch is to throttle the condenser outlet valves to maintain,the water boxes full.

The valve train mode selector switch is a-four position (A-B-C-D) switch. Selection ofthe appropriate switch position automatically throttles the condenserdischarge valves to the position necessary for the various intakepump combinations. The following pump combinations areassociated with the individual mode selector switch positions (refer toOP-29 Fig. 29-1):

1. Position A - Not normally used; prevents pump start.2. Position B - Used with waterbox air removal out-of-service; throttles

condenser outlet valves open to winter flow rate setting.3. Position C - 3 pumps on 4 water boxes; throttles condenser outlet

valve to open to normal flow rate setting.4. Position D - 4 pumps on 4 water boxes; throttles condenser outlet

valves open to position allowed in the summer on one unit only.

The correct mode selector switch position to initiate a pump start is always position "D".After the pump start, the mode selector switch is returned to theposition associated with the number of operating pumps.

When the CWIP control switch is taken to the START position, the pump dischargevalve begins to open. As the valve passes through the 12% openposition, a limit switch initiates the pump motor start signal. The valvecontinues to the 100% open position. The discharge valves areequipped with two speed actuators which will stroke the valve from12% to full open in 15 seconds.

I SD-29 - Rev. 2 of 85 I

Placing the CWIP control switch in the STOP position initiates the closing of thedischarge valve. The two-speed actuator will close the valve in 30seconds. As the discharge valve passes through the 34% openposition, the pump automatically trips. If the pump trips for any otherreason the discharge valve will also return to the fully closed position.The circulating water intake pump will trip if any of the followingconditions occur:

a. Low lube water flow at 7.0 GPMb. Discharge valve less than 34% open for any reasonc. Instantaneous overcurrent at 2400 amps (50/51 device)d. Time overcurrent at 1200 amps for 29 seconds (50/51 device)e. Unbalanced phase current at 3 amps difference for 3 secondsf. Differential current or phase angle in all 3 phasesg. Undervoltageh. Turbine Building Flood Detection System Hi-Hi level at

108 inches with confirmatory Hi level at 60 inches.i. Traveling screen differential Hi-Hi at 48 inches. If the water level

differential across the CW screens exceeds 60 inches collapse ofthe screen and/or cavitation of the pumps could occur.

j. Motor winding Hi-Hi temperature (Annunciation only)k. Motor bearing temperature Hi-Hi (Annunciation only)

Other than for emergencies the CWIP configuration should not be changed whenIntake Canal Level is less than zero feet Main Sea Level (MSL) asread on the Intake/Discharge Canal Recorder, SCW-LR-285/CW-LR-761. This avoids tripping the pumps with fine mesh screens on highDP.

NOTE: Available setpoints are listed in Table 29-5.

3.2.2 Condenser Isolation Valve Control

Each condenser inlet and outlet isolation valve has automatic and manual modes ofcontrol selectable at the RTGB. During normal operation, isolationvalves are controlled in automatic by the valve train mode selectorswitch. The manual mode of control is used to isolate a particularwater box. In the manual mode, each condenser inlet-outlet isolationvalve pair is controlled by its own control switch. These switches areCW-CS-418 through CW-CS-421.

SD-29 ; Rev. 2 of85

3.2.3 Circulating Water Ocean Discharge Pump Control

The CWOD Pumps can be operated either locally at Caswell Beach or remotely fromthe Control Room. A local/remote control switch at Caswell Beachdetermines the controlling location. When the local/remote controlswitch is in the LOCAL position the start/stop control switch atCaswell Beach can be used to control the pump. When the switch isin REMOTE the start/stop switch on the RTGB is used to control thepump via the supervisory control system. When shifting betweenremote and local operation caution must be taken to ensure bothcontrol switches are in the same position; i.e., if the pump is beingcontrolled remotely and is running, the pump would stop if the localcontrol switch is in the STOP position and control is shifted to local.

The START command will initiate opening the pump's discharge valve. The pump willstart when the valve reaches 50% open. After the pump start, thevalve continues to fully open.

Taking the CWOD control switch to the STOP position initiates the closing of thedischarge valve, tripping the pump as the valve passes through the50% open position. The CWOD will trip if any of the followingconditions occur:

1. Motor and pump bearing lube water flow low at 6.5 GPM2. Discharge valve less than 50% open for any reason3. Instantaneous overcurrent4. Time overcurrent

NOTE: Available setpoints are listed in Table 29-5.

I SD-29 - - Rev. 2 | Page32of85|

3.2.4 Circulating Water Discharge Pump Lube Water Pump Control

The CWOD lube water pumps can be operated either locally at Caswell Beach orremotely from the Control Room. A local/remote control switch atCaswell Beach determines the controlling location. When thelocal/remote control switch is in the LOCAL position the auto(on)/stop control switch at Caswell Beach can be used to control thepump. When the switch is in REMOTE the auto (on)/stop switch onthe RTGB is used to control the pump via the supervisory controlsystem. When shifting between remote and local operation cautionmust be taken to ensure both control switches are in the sameposition; i.e., if the pump is being controlled remotely and is running,the pump would stop if the local control switch is in the STOP positionand control is shifted to local. The pumps are designed to operatealternately with an interlock preventing the operation of both pumpssimultaneously. During manual control, whether from the ControlRoom or from the local control panel, a selected lube water pumpresponds to a manually initiated ON command only if the lube waterdischarge header pressure is less than 30 psig. In automatic control,the pump automatically starts if header pressure is less than 30 psig.Once a pump is started it will run continuously unless it is manuallystopped.

During circulating water discharge pump operation, a lube water pump is continuouslyrun to prevent the accumulation of sand and other abrasives on thebearings and seals of the discharge pumps.

3.2.5 Supervisory System

The supervisory system consists of a master station located in the Control Room and aremote station located at the Caswell Beach Pumping Station.Control of the system is from the RTGB. The signals are transmittedvia a microwave system. The supervisory cabinet in the ControlRoom (XU37) provides controls and indications of the status of themicrowave system.

SD-29 I Rev. 2 - - of 85

Each supervisory control point (control switch for operating a component) is providedwith a point select push button. Point select push buttons are thelighted type which illuminate only after the master station confirms avalid message from the remote station. The point select push buttonpermits an operator to perform a specific control function. When thepoint select button of a selected point to be controlled is depressed,the master station will transmit a signal to the remote station where itis checked for validity. A valid message will illuminate the checkbacklamp on the selected point push button and allow the operator toperform the control function. Selection of a control point blocksselection of all other control points.

After selection of a control point, the operator has ten seconds to perform the controloperation. After ten seconds, the supervisory system automaticallyresets. As the controlled device changes position, position indicatinglamps will show the new status. Should a device change positionwithout the operator initiating the change, the new status indicatinglight will flash and an alarm will be annunciated.

System Operating Enhancements:

By replacing Quindar with an Allen Bradley SLC 500 controller several intuitiveenhancements were easily programmed into the system. These wereadded to assist the operator in operation of the U1 & U2 CaswellBeach supervisory system. The new system will do the following:

1 . Detect loss of valve/breaker position or parameter indication inputs.If.RTGB valve or breaker indication is not present for a certain periodof time, then the output indication for the missing inputs flash fast. Abypass feature is included on the 4 MWOD valves and 2-480Vbreakers (incoming and tie). This will allow for these pieces ofequipment to be taken out of service for a period of time withoutleaving the loss of parameter indication computer point in on theprocess computer and the Caswell Beach supervisory troubleannunciator in (along with device's indication flashing lights) on theRTGB. This feature (See 1&2APP-UA-05-2-1) is enabled by turning

* the position switch of the CWOD pump or 480V breaker to the tripposition and holding point cancel down at the same time. The bypasswill be disabled and automatically reset when open indication of the

MWOD valve or 480V breaker is received.

SD-29 - Rev. 2 of 85

2. Prevents masking of common annunciators through a re-flashfeature. If a Caswell Beach breaker trip annunciation (UA24 1-7) hascome in (the breakers open indication lights will also flash on theRTGB), and another Caswell Beach breaker trip comes in (its breakeropen indication lights will also be fast flashing) before the first oneclears, the Caswell Beach breaker trip annunciator will briefly go outand then come back in and flash at its alarm rate until acknowledgedby an operator. All involved RTGB component indication lights willfast flash until supervisory reset is pushed, and then go solid. So nowtwo breakers open indication lights are solid. This holds true also forUA24 2-7 (motor overload), UA24 3-7 (motor ground current),UA24 4-7 (motor temperature high), UA24 5-7 (lube wa ter flow low),and UA5 2-1 (CW Beach supervisory system trouble - re-flash notavailable with master station failure, because this causes loss of alllogic determination). When the alarm condition clears, thecorresponding indication will flash slowly, alerting the operator to hitsupervisory reset.

3. Performs actual breaker trip determinations based on presentlymonitored breaker parameters. The system is able to differentiatebetween a commanded open breaker and an actual breaker trip.Therefore, a breaker trip annunciation is no longer received when abreaker is opened.

4. It has enabled additional test features. It will test all annunciators andcomputer points, in addition to the normal white/red/green lamp test.These will be particularly helpful in troubleshooting.

5. It has enhanced operator status light indication.

a. The affected components status light will fast flash to indicatea trip or alarm.

b. The affected components status light will slow flash to indicatea reset of a trip or alarm.

c. The operator is prompted to cancel a command after a failedcommand execution.

I SD-29 I Rev. 2 | of 85|

6. The Supervisory system trouble computer points have been revisedto work with this new Allen Bradley system

a. Loss of Communications (C1336) - Indicates modemmalfunction or loss microwave link.

b. Remote Station Fail (C1339) - Indicates that the remoteprocessor has halted due to a major error or is not in run.

c. Master Station Fail (C1338) - Indicates that the masterprocessor has halted due to a major error or is not in run.

d. Loss of 24 VDC power supply/or loss of parameter indication(C1337) - It indicates that the Master stations 24 VDC powersupply (Technipower) has malfunctioned (This provides powerfor the status lights on the RTGB) or loss of one or moreparameter indication signals.

7. The supervisory ready light never goes out, except on the loss of24 VDC in the supervisory panel (1 (2)-JM7). It fast flashes when theabove first 3 failures occur. These failures are not reset-able, untilalarm condition has gone away. This light is normally on steadywhen the system is OK.

No changes to the control display location and or function have been made.However, the corresponding RTGB switch indication lights forcomponents in an alarm condition will fast flash until acknowledgedwith a supervisory reset, then go solid when acknowledged, and slowflash when alarm condition clears.

3.2.6 Debris Filter Backwashing (Figure 29-2)

Debris filter backwashing is performed on a daily basis to minimize marine growth withinthe filter or if a high differential pressure occurs across the filter. Anannunciator actuates upon high differential pressure (80 inches waterincreasing) in the Control Room Annunciator Panel UA-01. A whitelight above the impacted condenser inlet valve also illuminates.

SD-29 I Rev. 2 - - - Page736 of 85|

To insure sufficient flow for backwashing filters, the valve train mode selector switchmust be positioned in accordance with Figure 1 of OP-29. Flows inexcess of the flow minimization guidelines are limited to eight hoursper week or when system reserve is 200 mwe or less. (Flowminimization restrictions are shown in Table 29-1.) Adequate flow forbackwashing is obtained by the isolation of debris filters or thestarting of additional circulating water pumps. The minimum numberof operating pumps required for an efficient backwash is 3 per OP-29.Each filter requires a minimum of 114,000 gpm for backwashing.

The water box select switch and debris filter backwash select switch are operated inconjunction to initiate debris filter backwashing.

1. Select the NORTH or SOUTH position on the water box select switchto select the correct condenser.

2. Initiate backwashing by selecting a water box (A-BW or B-BW) on thedebris filter backwash select switch

3. Filter flush dump valve opens

4. The following filter inlet butterfly valve operation is observed whenbackwashing a water box debris filter to direct the flow around thescreen to wash it off:

a. Valve drives 150% open and remains in this position for5 minutes

b. Valve drives 50% open and remains in this position for 5 minutesc. Valve returns to the 100% open position

3.2.7 Temperature Indications

Temperature elements throughout the circulating water system can be used todetermine the amount of heat being added to the circulating waterand thus the environment. These temperature elements can be readon the BOP computer. Two of the more important readings are thetemperature rise across a condenser (BOP Type Log 4) and theaverage intake canal temperature.

SD-29 Rev. 2 of 85

3.2.8 Flow Minimization Schedule

The Circulating Water System is operated in accordance with a National PollutantDischarge Elimination System (NPDES) permit to minimize larvalmarine growth intake and to maintain ocean discharge temperaturewithin prescribed limits. Table 29-1 is a flow minimization schedulewhich provides the necessary guidelines for Circulating Water Systemoperation. Normal full power operation is with three intake and threedischarge pumps running per unit. Normal system configuration is forthree of the four CW traveling screens on each unit to be equippedwith fine mesh'(1 mm) screen panels.

The NPDES permit also requires intake and discharge temperatures to be monitored toavoid damage to the ecosystem.

The NPDES permit also states that CW traveling screens with fine mesh panels mustbe in operation as long as the associated CWIP is in operation. Ifuse of any fine mesh screen is not possible, notice shall be providedto E&RC explaining why.

3.3 Tube Sheet Pressurization Subsystem Control

3.3.1 Control

The system provides manual control by quarter-turn ball valves located on the supportrack. Either filter or pressure-reducing valve can be valved out ofservice for maintenance while the other maintains operation. Bypasslines can be opened and the flow switches can be valved out formaintenance. To determine the location of major leaks, the bypassvalve in the branch to each tube sheet can be closed forcing full flowthrough the flow meters.


1. Instrumentation which monitors the system parameters which providean alarm on the local panel and which provide input to Control Roomannunciation are listed on Table 29-5.

2. Instrumentation which provide local indication at the support rack islisted on Table 29-3.1.

SD-29 Rev. 2 I of 85

3.4 Cathodic Protection Subsystem

3.4.1 Control

The system provides manual control, by manually adjusting the potentiometer to the:desired DC output, or automatic control with the use of the potentialcontrolled automatic circuit (APC circuit). The system is put into.service by manually closing the two 480 Vac disconnect switches(1/Inlet Waterboxes, 1/Outlet Waterboxes) located on the rack by therectifier cabinets. The system normally operates in automatic control.


1. Instrumentation at Rectifiers

Instrumentation, which provides local indication at the rectifiers, is listed below:

Instrument Description Range

Top Voltmeter-DCMiddle Voltmeter-DCLower Ampmeter

Reference PotentialTotal VoltageTotal Current

0-1.5 Vdc0-30 Vdc0-50 Amps

2. Instrumentation at Junction Box

Instrumentation, which provides local indication at each junction box (8), is listed below:

Instrument Description Bange

Voltmeter-DC Reference Potential 0-1.5 Vdc

3.4.3 Dual Light Alarm

Each rectifier cabinet has a dual light alarm located on the rectifier cabinet. When thered light is on and the amber light is off, normal operation is indicated.When the red light is off and the amber light is on, lack of adequate

DC output is indicated. When both the red and amber lights are off,system shutdown/loss of AC input is indicated and an annunciator onUA-24 in the Control Room will alarm.

SD-29 Rev. 2 - of 85

3.5 AMERTAP Condenser Tube Cleaning Subsystem Control

3.5.1 Manual Control

The condenser tube cleaning system is controlled from the local control panel locatednear the ball collector unit. The system had the capability to beoperated automatically, but is now only operated manually. Tooperate the system, the Cycle/Test Switch is placed in the TESTposition and the Startup section of the Operating Procedure isfollowed.

When operating the system manually caution must be taken to ensure the upper andlower screens are operated correctly. Screens must be closed whensystem is in operation to collect balls (on Unit 2, the ball strainershave been abandoned per ESR 97-00576 ). Improper operation ofthe screens can allow the AMERTAP Balls to be released to thedischarge canal. Wildlife, especially sea gulls, might attempt to eatthe balls.

3.5.2 Automatic Control

Not Used

3.6 Condenser Water Box Air Removal Subsystem Control

3.6.1 Control

Vacuum pump operation is initiated by off/auto/on switches and lead/lag pump selectswitches on the cover of the local control panel. There is a lead andlag vacuum pump. With pumps in the auto position, start will be byincreasing system pressure (decreasing vacuum). Vacuum switchesmount on the vacuum priming tank and each shall have a variablesetpoint to start the lead pump with lead switch and start the lagpump with the lag switch. These settings are adjusted to suit thecirculating water system hydraulic gradient. The vacuum pumps musthave seal water flow. The pump start circuit will open a seal watersupply solenoid valve. Water flow will be sensed and allow the sealwater flow switch to make thus enabling a pump start.

I SD-29 - |- Rev. 2 1 of 85 |

The vacuum pumps take suction from the vacuum priming tank which is connected tothe tops of the inlet/outlet condenser water boxes on both BNP units.The vacuum system may be manually isolated and vented on oneunit while remaining in operation on the other.

Indication of vacuum system failure is made whenever pumps are selected to the ON orAUTO position and vacuum falls close to atmospheric pressure. Analarm will be indicated on annunciator UA-03 on both unitpanelboards.

Water box air removal shall be isolated from a unit prior to shutting down the circulatingwater system. The air removal system does not provide advantage tothe unit when the unit is off line, and shutdown of the system isrecommended during periods of cold shutdown.

The water box air removal subsystem is located on the 70' elevation of the turbinebuilding, east side, between the two unit main generators. The waterbox air removal vacuum pumps will be started from the local panel inthis area. System valves other than the individual water box isolationvalves are located in the same area.

Operator action will be required to startup and shutdown the system. Operation of thesystem is monitored by indication of system failure at the ControlRoom HVAC Annunciator Panel UA-03 on each unit.


There is a single control panel for local operation of the two vacuum pumps. Thecontrol panel enclosure is a stainless steel, NEMA 3 box as perspecification 48-1 and is next to the vacuum pumps. The pumpsreceive power from MCC's 2TH and 2TL.The panel has anOFF-AUTO-ON selector switch for each pump, and a lead 2A (left)lead 2B (right) selector switch for lead pump selection. Vacuumswitches provide control on priming tank vacuum. Initial setting shallbe 12" HG absolute to start the lead pump, and 18" HG absolute tostart the lag pump. Each switch shall be set for 6" HG differential.

Separate seal water control is required for each pump. -A solenoid valve to start sealwater flow is wired in parallel with the motor starter coil. A flow switchis wired in series with the motor starter and shall close circuit topermit and maintain motor operation. A red run lamp and run timemeter is wired in parallel with each of the motor starter coils andmounted on the panel cover to indicate the running pumps and atotalized time of operation.

I SD-29 I Rev. 2 | of85|

A third vacuum switch with DPDT contacts operates upon high absolute pressure, > 25"HG absolute, in the vacuum priming tank, indicative of vacuumsystem failure (N.C. and open on alarm). The DPDT contacts willprovide annunciation at Unit 1 and Unit 2 Control Room panels.Control panel logic will be such that annunciation shall not be madewhen both pumps are selected to OFF position.

There is a differential pressure gauge for each inlet water box. The gages use aconnection on each water box at elevation 22'-4" as a variable leg.All of the gages on a unit connect to a common point in the airremoval header as a reference leg. Each gage indicates over arange of 0-40 feet of water. 40 feet provides indication of water beingat 62'-4" elevation which is at the reference leg connection. Zero feetprovides indication of water being at 22'-4" elevation which is thevariable leg connection.

3.7 Power Supplies

Table 29-2 provides a reference listing of power supplies for major circulating watersystem and associated support subsystem components.

3.8 Monitoring Instrumentation


Table 29-3.1 provides a reference listing of instrumentation for major Circulating WaterSystem and associated support subsystem components.

Table 29-3.2 provides a reference listing of points associated with the system that ismonitored by the supervisory system.

-SD-29 Rev. 2 | of 85 |

3.8.2 Annunciators

Table 29-4 provides a reference listing of annunciators for circulating Water Systemand associated support subsystem process variables. Consult theAnnunciator Panel Procedures for the associated window numbersand appropriate response.

3.8.3 Process Computer Interface

System operating parameter values can be obtained in text or graphical form from theplant process computer. Operating trends may also be established forboth the short term and long term. A listing of special processcomputer points may be obtained using the Cross Reference List for*analog inputs to the Plant Process Computer from OSD-55.

| SD-29 | - Rev. 2 | of 85

3.9 Instrument and Control Setpoints

Table 29-5 is a table of instrumentation that provides trip functions. In cases where aninstrument from a system other than the Circulating Water System is listed,the official setpoint and trip functions will be found in the system descriptionto which that instrument belongs.

NOTE: Setpoints for devices not listed in the Instrument and Control Setpointtable may be specified in other design or procurement documents. The followingdocuments should be researched in the specified order to identify thesesetpoints:

1. EDBS (Screen 455)

2. Instrument schedules (LL-7000 and LL-70000 series drawings)

3. P&ID for the system

4. Associated drawings (reference EDBS for associated drawing numbers)

5. Instrument Data Sheets (for GE-supplied equipment)

6. Procurement specifications and related data sheets

7. Purchase order documentation

8. Vendor manual

If, after the above investigative steps have been pursued, the setpoints are notidentified, then the appropriate System Engineer should be contacted forguidance.

This note was inserted to comply with Quality Check Concern Number 12279.

I SD-29 | Rev. 2 | of 85 |

4.0 SYSTEM OPERATION

4.1 Normal Operational Relationships

4.1.1 The Circulating Water system is placed in service in accordance withOP-29.

4.1.2 A procedural caution states that starting a CWIP can cause a voltagedrop of sufficient magnitude that on occasion a momentary increasein Reactor Recirculation Pump speed will be seen. This is due to thescoop tube positioner operating characteristics.

4.1.3 I ana#-0 ft.

T ice S ingiowtides

4.1.4 When isolating and draining a condenser circulating water box theopen condenser discharge valve breaker(s) are placed in the offposition. This step ensures that the water box is allowed to drain.The drained water box Debris Filter Flush Valve breaker is placed inthe OFF position after the valve(s) is OPEN to allow drainage on theinlet side.

4.1.5 The screen wash pumps associated with circulating water travelingscreens also provide screen wash for the service water travelingscreen. A screen wash pump must be in service when either thecirculating water or service water traveling screens are in service toprevent debris or marine life carryover to the systems.

4.1.6 The screen wash system should be operated for one complete cycle(45 minutes) after a circulating water pump is secured to ensure thatthe screen is clean.

4.1.7 When backwashing the CWOD lube water strainers or motor coolingcoils caution must be taken to ensure lube water pressure is notdecreased to a point where the CWODs will trip. This is particularlytrue when operating the strainer backwash valve. The valve must notbe opened greater than 50%. Modifications to improve this restrictionare in progress.

4.1.8 Each ocean discharge pipe must have at least one pump running atall times to prevent silting of the piping.

SD-29 _I - Rev. 2 - of 85

4.2 Abnormal Operation

4.2.1 AOP-33.0, "Oil Spills In Cape Fear River", discusses oil fouling of thecondenser heat transfer surfaces and blockage of the fine meshscreens, and recommends the following:

1. Reduce load and minimize circulating water flow

2. Cycle circ pumps to avoid loss of vacuum due to oil fouling

4.2.2

4.2.3

AOP-37.0 "Low Condenser Vacuum", discusses actions related to theCirculating Water system. The removal of a circulating water pump(water box) above 60% power could cause a turbine trip and a reactorscram due to low vacuum.

AOP-37.1, "Intake Structure Blockages," discusses the following:

A high differential pressure across the circulating water intake traveling screens canresult from a variety of malfunctions or outside influences including:

An increase in marine life entrained by the traveling screens.

. An increase of debris in the intake canal from recent storms orexcessively high or low tides.

. Mechanical or electrical failure of the traveling system.

Ttaiilf heen Hi eva tting the

passafel _anaus routed adisthc f H~and. From this point the

at the intake

remq umi rte c9o ndintion ndmaximum tide conditions.

I SD-29 I Rev. 2 | of 85|

Traveling scr

t e^.y4wjjty e .tn andp sE_ on change and the-

amount of debris in the vicinity of the p an -iudtfate. T&

Gr It'a__yga s asom~f lry andis tr u mediumsize buh s s Aells,docks- W :.f the

migg, they typically attach to hard structuresand lited wave action duringand afterstoranes may na se the ratethat~rta 1aria fraqments are movl b~nto the

i n trani rately effective onlyon the~i~tsi oe-erfis reans.

Detritius is the decay product of plant and animal mater. It has a characteristic brownmuddy appearance and is very fine in texture. Detritius presents asignificant hazard to the fine mesh screens, but will typically passthrough the coarse mesh screens with minimal increase in screen dp.Detritius is a particular nuisance in the summer-months during

periods of lower tides. The primary reasons for this are the increasein the canal bottom temperature and the higher water velocity due tolarger tidal amplitudes and increased number of CWIPs and SWpumps in the operation. The increase in temperature causes theorganic debris in the bottom of the intake canal to decay at a higherrate. This biological decay process produces a hydrogen sulfide gaswhich builds up in the sediments and tends to loosen the detritius,making it more available for resuspension into the water column.These resuspended particles can then be transported by the flowingwater to the intake screens. Fire hose use on detritius is typically noteffective because of the large quantities present. Increased pressureon the trash wash header is most effective on detritius.

SD-29 - I Rev. 2 of 85

Marine vents are as unpredictable as'dertsvens a d~~' ~~i~~y~p ogo4At-he traveling

scrll _ an gisms~ha~.chanes i watr uai severe storm eventsnclha~f~~li~ .. aY e~rte re sig

can dump large amo _ e ba s whichforce itiwed I normally loczte n,downs reamoac I scin marinelife in the area to move down with the sa wembers.

Durin-g aiS a be coldrssesh ials

ajtksc j u ,.ember. These cold

__ asd spray headerpressures me carryover ispre nt.

When a start signal is sent to a CWIP, it is important to remember that during the startcycle, water is being pushed back into the intake canal through thedischarge valve for approximately 4 seconds before the pumpreceives a start signal. When a CWIP trips, it takes approximately 30seconds for the discharge valve to travel full closed. During both ofthese events, significant mixing of the intake canal contents directly infront of the intake pump suction is occurring and can affect both unitsscreens. Historical data indicates that this makes both units finemesh screens especially vulnerable during a detritius incursion.

4.2.4 AOP-36.1 "Loss of any 4 kV Buses or 480 V E-Buses" has a stepstating that; if required, to defeat the circulating water pump autostart, then place the CW Valve Train Mode Selector Switch inPosition A. This will defeat the uncontrolled start of the CWIP due tothe pump discharge valve being open when power is restored.

SD-29 I Rev. 2 - of 85

4.2.5 Effect of CW System Losses

Losses experienced in the Circulating Water system can have the following effects:

1. Condenser Vacuum

A loss in heat removal capability for the condenser will result in an increasingtemperature condition. Since the condenser is a saturated system,this will result in a pressure increase or vacuum loss. Strong potentialfor turbine trip/reactor scram. Also a potential for loss of thepreferred heat sink in accident conditions. A new AOP is beingdeveloped for intake structure blockages. See SD-29-1 for moreinformation.

2. Condensate System

Loss of condenser cooling will result in a condensate system heatup as less heat canbe rejected from the turbine exhaust steam. This will increase thepotential for pump cavitation in the condensate system. It will alsocause an increasing temperature condition in the components cooledby the condensate system.

3. Main Turbine

A loss of condenser cooling and subsequent increase in condenser absolute pressureresults in a decrease of the delta-pressure across the turbine. Thisresults in less turbine energy for electricity generation. The net resultis a decrease in turbine efficiency.

4. DC Electrical System

A loss of DC panel 3(4)AB on site or CWA-3 at Caswell Beach will render the CaswellBeach Supervisory System inoperable.

5. Releases

A reduction in circulating water flow which provides dilution to the plant liquidradioactive release path will result in the concentrations of thereleases to the environment being higher than acceptable. This couldresult in a loss of the release path or releases in excess of 1 0-CFRlimitations.

SD-29 I Rev. 2 - of 85

4.3 Interrelationships With Other Systems

The Circulating Water System interfaces with the following systems:

4.3.1 Service Air provides testing and emergency supply to the TSP with aloss of demin water.

4.3.2 Conventional Service Water provides lubricating water to the CWIPsand system filling after maintenance. Caution must be taken whenplacing a TBCCW heat exchanger in service. If the valves areopened to fast the CWIPs lube water pressure might drop, trippingthe pumps. Also when filling the circulating water system fromservice water, the valves must be slowly operated to prevent droppingservice water pressure and causing the standby pump to start.

4.3.3 Provides dilution flow for liquid radioactive waste releases.

4.3.4 Ps(b e _ a a orControl of

dnIng nn, the

When the chlorination system is aligned for injection to the circulating watersystem, the solution control valve will be closed when the associatedpump is secured. When the pump is started the solution controlvalve will open when the CWIP discharge valve reaches 12% open.When the CWIP is secured or trips the solution control valve willclose when the CWIP discharge valve reaches 34% closed.

SD-29 I Rev. 2 - of 85

5.0 RELATED INDUSTRY EVENTS

5.1 PS 3923, Manual Reactor Scram Due to Loss of Condenser VacuumDuring Unit Startup

Unit 1 was starting up following a refueling outage when operators manually scrammedthe reactor due to decreasing condenser vacuum. All rods inserted asrequired. The turbine was not online during this event, and the lowest waterlevel seen was approximately +140".

Prior to the manual scram, the unit was receiving main condenser Circulating Waterintake pump (CWIP) screen high differential pressure trips. Upon pumprestart, the pump would run for approximately 30 seconds prior to trippingagain. Aquatic plant life (Gracilaria) impinged on the fine mesh CW travelingscreens causing high differential pressure and resulting CWIP trips.

5.2 OE 2846, Circ Water Pump Trip Event

Six (6) of seven (7) running condenser circulating water pumps tripped within a fewminutes of each other causing a forced power reduction to 40% in one unitand a loss of circulating water on the shutdown unit.

The cause of the circulating water pump trips was high circulating water travelingscreen differential pressure on fine mesh screens due to large number(clumps) of skeletal shrimp attaching to the screens. Brunswick'senvironmental permit requires three (3) out of four (4) traveling screens tobe fine mesh on each unit. Skeletal shrimp have not been seen in suchconcentrations before. Low rainfall apparently resulted in decreased riverflow and higher intake canal salinity.

SD-29 Rev. 2 of 85

5.3 SER 7-96, Condenser Tube Failure

On January 9, 1996, Crystal River Unit 3 was at 100 percent power when a condensertube leak was detected. The unit was operating with Waterbox A isolatedand open for maintenance. The source of the leak was quickly identified -asa main condenser titanium tube rupture in Waterbox B. (Waterbox Bservices the same low pressure turbine rotor as Waterbox A.). BecauseWaterbox A was out of service, Waterbox B circulating water pump couldnot be shut down while the turbine was in operation.

During this event, significant chemical contamination (including chloride) of thecondenser hotwell, condensate and feedwater systems, and steamgenerators occurred. Plant procedures provided insufficient guidance forresponding to rapid contamination ingress to the secondary system. As aresult, operation continued while plant conditions were evaluated, and anoperational decision to shut down and cool down the plant wasunnecessarily delayed. In addition, the unit shutdown and cooldownprocess was further delayed because contingency plans for rapid cooldownof the plant with chemically contaminated secondary systems andcomponents were not established.

Subsequent investigation determined that the saltwater in-leakage was caused by thecircumferential failure of one condenser tube located near the center of thetube bundle below a drip pan. The tube severed midway between supportplates.

5.4 SER 8-96, Icing of Traveling Screens and Trash Racks

The Wolf Creek Generating Station experienced unusually cold weather conditionsduring the last week of January 1996. At approximately 2 a.m., on January30, 1996, these weather conditions resulted in extensive icing of thecirculating water intake structure traveling screens and frazil iceaccumulation on the safety-related essential service water system intaketrash racks. The frazil ice accumulation on the essential service water trashracks blocked lake water flow to one-of-two essential service water pumps.

SD-29 I Rev. 2 of 85

5.5 SOER 85-5, Internal Flooding of Power Plant Buildings

Internal plant flooding occurs from breaches of water systems that are located insideplant buildings and are connected to large water sources such as lakes,rivers, or tanks. Such flooding has the potential to cause common modefailure of equipment necessary to maintain core cooling and can be asignificant contributor to risk of core damage. Conditions that have led tointernal flooding include the opening of Circulating Water systems forcondenser cleaning or tube Repair; component failures such as piperupture, expansion joint failure, and valve or pump failures; and valvemispositioning.

5.6 CR 99-01661, Low Vacuum Trip Due to Fouling of Traveling Screens

Unit 2 scrammed due to a low vacuum turbine trip from near rated power. The initiatingevent was multiple Circulating Water Intake Pumps (CWIP) tripping due tofine mesh screen fouling. Initial reports pointed to a fish run, but follow-upinvestigations revealed the fish were actually a minor contributor to theevent. The most likely cause was detritus (Detritus is dead plant and animalmatter. The very bottom of the food chain, detritus is the rotting leaves in theforest, the silt on the bottom of the pond, the thick dark mud in the saltmarsh.) fouling caused by an astronomically low tide. The detritus foulingeventually caused a high differential pressure trip on the 2C CWIP. Basedon the most recent soundings for intake canal depth, it is estimated that-thesilt buildup is approximately four feet higher in front of the U2 circulatingwater intake structure vs. the Ul intake structure. The turbulence createdwhen the 2C CWIP tripped caused the silt at the bottom of the canal toviolently mix. This was due to the low tide and back flow through the CWIPdischarge valve. The silt became entrained in the flow stream of theremaining operating CWIPs resulting in a cascade effects on the remainingoperating fine mesh screens, and complicating recovery efforts.

I SD-29 Rev. 2 t - of 85 |

The inability to recover vacuum after the coarse mesh pump was started is most likelydue to the hydraulics and thermodynamics associated with the positions ofthe CWIP discharge valves and their resultant effect on condenser vacuumat various locations in the condenser. This would have greatly affected CWflow to the condenser. The path of least resistance to flow would have beenback through the intake canal rather than through the condenser. The rapidcondenser vacuum response and the location of the instrumentation mayhave also played a role in this difference.

Similar Situations/Generic Implications

An event involving a loss of condenser vacuum resulting in a manual reactor shutdownwas reported in LER 1-95-011. This event involved impingement of gracilariaon the fine mesh screens installed on the operating CWIP traveling screens.The gracilaria accumulation resulted from the combination of exaggeratedhigh and low tides and stormy weather conditions that occurred prior to the

* event. The actions implemented to address this event focused on preventionof gracilaria and could not reasonably be expected to have prevented theevent identified in this report.

Safety. Significance

The safety significance of this event is minimal in that the affected systems respondedas expected. In addition, ECCSs remained operable throughout the event. Inaddition, a total loss of condenser vacuum did not occur (i.e., vacuumdecreased to 24.01 inches of mercury) and consequently, the normal decayheat removal path was maintained through the condenser during the event.

6.0 REFERENCES

6.1 Technical Specifications

Applicable Technical Specifications should be referenced for requirements and bases.

6.2 Updated Final Safety Analysis Report

W~teUtjdiesserv~orsSectidfig>2 24 4.Structure -St $jA6SystemSectio~h 4 13 i W. a- ehs'er

Sat ~i lCodense Ct i na'ter~ystemSection 11.0 Radioactive Waste Management

I SD-29 I Rev. 2 | of 85

6.3 Piping & Instrumentation Drawings

Drawing Number Sheet No.

LL 22052 (Unit 1) 55A,55B,55CLL 2252 (Unit 2)

LL 70000 TSP Sys. (Unit 1) 1LL 7000 TSP Sys. (Unit 2)

LL 70000 TSP Sys. (Unit 1) 2LL 7000 TSP Sys. (Unit 2)

Iitla

Valve Schedule

Instrument Schedule

Instrument Schedule

Drawing Numher

D-20034 (Unit 1)D-2034 (Unit 2)

D-2051Pump Bearing Lube Water

D-17022

D-1 7023

D-17024

D-23011 (Unit 1)D-2311 (Unit 2)

D-20042 (Unit 1)D-2042 (Unit 2)

D-02348Pressurization and Leak Detection

D-20025 (Unit 1)D-2025 (Unit 2)

Tifl-

Circulating Water System

Circulating Water Discharge and

Turtle Blocker Panels



AMERTAP Ball andTube Cleaning

Screen Wash Water System

Integral Groove Tube Sheet

Off-Gas Removal and Condenser Water BoxAir Removal

I SD-29 | . Rev. 2 . of 85 |

6.3.1 Electrical Drawings

Drawing Numbpr TitlD-23011 (Unit 1)D-2311 (Unit 2)

D-20042 (Unit 1)D-2042 (Unit 2)

D-02348Pressurization and Leak Detection

D-20025 (Unit 1)D-2025 (Unit 2)

F-30027 (Unit 1)D-9050 (Unit 2)

F-30028 (Unit 1)D-03943 (Unit 2)

F-30029 (Unit 1)D-03944 (Unit 2)

F-30030 (Unit 1)D-3311 (Unit 2)

F-30031

AMERTAP Ball andTube Cleaning

Screen Wash Water System

Integral Groove Tube Sheet

Off-Gas Removal and Condenser Water BoxAir Removal

Electrical Wiring Schematic

Alarm Panel Details

Instrument Rack ElectricalPhysical Details

Alarm Panel InternalWiring Diagram

Interconnection WiringDiagram

SD-29 - Rev. 2 of 85

Drawing Number Sheet No- Tlea

F-37019 (Unit 1)F-3719 (Unit 2)LL 92013 (Unit 1)"C5A" Condenser 1A(2A) ControlLL 9213 (Unit 2)LL 92013 (Unit 1)"C5B" Condenser 1 B(2B) ControlLL 9213 (Unit 2)0-FP-9730

Units 1 and 2 WiringSchematic CondenserShell 1A and 2A

0-FP-9731Units 1 and 2 WiringSchematic CondenserShell 1 B and 2B

0-FP-9732Units 1 and 2 Water BoxPenetration and Plan ViewSchematic

0-FP-9733Units 1 and 2 DetailJunction and TerminalBoxes

0-FP-9734Units 1 and 2 Bay AnodePenetrations Detail

0-FP-9748Units 1 and 2 RectifierCabinet Detail

0-FP-9749Units 1 and 2 RectifierCabinet Internal Detail

MCC "1TC" Sht 3 IWDMCC "2TC" Sht 3 IWDMCC "1TC" ("2TC") Compt79

80Wiring and Cable DiagramMCC "1TC" ("2TC") Compt

Wiring and Cable DiagramCathodic Protection

Cathodic Protection

Cathodic Protection

Cathodic Protection

Cathodic Protection

Cathodic Protection

Cathodic Protection

SD-29 - Rev. 2 of 85|

6.3.2 Specification

Specification BX-M-029, Integrally-Grooved Tube Sheet Pressurization and leakDetection System,


Drawing Numbers Tit1e

LL 70000 (Unit 1) Circulating Water (CW) InstrumentLL 7000 (Unit 2)Schedules

6.4 Control Wiring Diagrams

Drawing N9tmrers I2

LL 92057 (9257) Control Wiring Diagrams, MCC 1(2) SA

LL 92013 (9213) Control Wiring Diagrams, MCC 1(2) TC

LL 92014 (9214) Control Wiring Diagrams, MCC 1(2) TD

LL 92015 (9215) Control Wiring Diagrams, MCC 1(2) TE

LL 92016 (9216) Control Wiring Diagrams, MCC 1(2) TF

LL 9218 Control Wiring Diagrams, MCC 2TH

LL 9222 Control Wiring Diagrams, MCC 2TL

LL 92025 (9225) Control Wiring Diagrams, MCC 1 (2)TP

LL 9268 Control Wiring Diagrams, MCC CWA

LSD-29 I Rev. 2 | Page58of85

6.5 Modification Packages

* Plant Mod 81-227B

Plant Mod 81-227C

ESR-9700726

ESR-97-00051, Rev 0

ESR 97-00125, Rev 0

ESR 98-00096, Rev 5

ESR 99-00359

ESR 99-00185

6.6 Procedures

6.6.1 Procedures

OP-29

OP-29.1

OP-29.3

OP-43

Fish Diversion Structure

Screens and Frames


Recorder Modification, Unit 1

Recorder Modification, Unit 2

Caswell Beach Supervisory Equipment

Supervisory Setpoints

CW Waterbox Level Glasses

Circulating Water System

Screen Wash System Operation Procedure

Amertap Condenser Tube Cleaning System

Operation Procedure

Service Water System

SD-29 Rev. 2 of 85

6.6.2 Technical Manuals

Foreign Print Numher

FP 20227 (Section 5)

FP 20227 (Section 3)

FP 3439

FP 9883

FP 9863

FP 9713

FP-901 5

FP-81 926

ihae

CW Discharge Pumps, Ingersol-Rand

CW Intake Pumps, Ingersol-Rand

CW Discharge Pump Motor, Portec

CW Intake Pump Motor, Electric Machinery

Traveling Water Screens, FMC Corp.

Unit 1 CWIP Discharge Valve Actuator,Limitorque

AMERTAP Ball Tube Cleaning System andDebris Filter

Instruction For Debris Filter

SD-29 I Rev. 2 - - of 85

6.7 Miscellaneous

6.7.1 Equipment Specifications

Specification Number Title

238-6

238-9

248-13

142-2

CW Intake Pumps

CW Discharge Pumps

CW System Butterfly Valves

Caswell Beach Pumping Station SupervisoryControl System

Valve Actuators

Self-Cleaning Debris Filter

Waterbox Air Removal Vacuum System

Foulant Release Coating of CW Piping

248-7

236-101

238-046

BNP-W-003

6.7.2 Specification

Specification BX-M-022, Automatic Cathodic Protection System for Condenser TubeSheets

7.0 TABLES

Unless otherwise noted, the attached tables and drawings are for informationonly. For performing actions to meet the requirements of regulations, plantlicense, commitments or management directions, use the appropriate procedureand reference drawing or print.

SD-29 Rev. 2 - of 85 |

VI =-~--.- --~-uNalo y~ 1cWstontsfor-

Month Four Water Boxes Three Water Boxes Flushing Debris Filters System Demand

Max Disch No. of Sel SW No. of Sel SW No. of Set SW * No. of Sel SWRate Pumps in (Note 2) Pumps in (Note 2) Pumps in (Note 2) Pumps in (Note 2)

Service Service Service Service

r 3 B 3 B 3 B 4 D**

ov 3 C 3 B 3 C*. 4 D*

4 c3e61 V4 C.. 3 B 4 C** 4 D**

e C''..

*Minimum flow for washing debris filters. Flows In excess of the flow minimization guidelines are limited to eighthours per week. Condenser water box air removal may be taken out of service when in the B position.

**C and D positions require water box air removal system in service, to maintain water boxes full.

**'C position with 3 water boxes in service may require operation of condenser water box removal to maintain fullwater boxes.

NOTE: ;

NOTE 2: Condenser water box air removal may be operated while in the B position, however, operation isnormally not necessary to maintain full water boxes in the B position. C and D positions requirecondenser water box air removal system in service, because the water boxes can only be maintainedfull in these switch positions with condenser air removal system in service.

q-1, / qe 1-31 8Y

II I;b C ASH/q~ - 5 4 Y

111.3° } 5 a;11173

4'fs@- 855

Yft3.5-

SD-29 I | Rev. 2 of 85

TABLE 29-2Page 1 of 2

Power Supplies

Component

CWIP 1(2) A and C

CWIP 1(2) B and D

CWIP 1(2) A, B, C, D Discharge vIvs

CWIP 1(2) A, B, C, D Diverting Zone IsolVIvs

Cond 1(2) A-N and S CW Isolation vivs

Cond 1(2) B-N and S CW Isolation vlvs

Cond 1(2) A-N and S Debris Fit Flushvlvs

Cond 1(2) B-N and S Debris Fit Flushvivs

Cond 1(2) A-N and S Discharge vivs

Cond 1(2) B-N and S Discharge vlvs

Unit 1(2) Cathodic Protection Subsystem

Unit 1(2) Condenser Tube CleaningSubsystem

Condenser Water Box Air RemovalVacuum Pump 2A

Condenser Water Box Air RemovalVacuum Pump 2B

CWOD Pump 1(2) A and B

CWOD Pump 1(2) C and D

Power Suppil

4160 bus 1(2) C

4160 BUS 1(2) D

MCC 1(2) SA

MCC 1(2) SA

MCC 1(2) TC

MCC 1(2) TE

MCC 1(2) TC

MCC 1(2) TE

MCC 1(2) TF

MCC 1(2) TD

MCC 1(2) TC

MCC 1(2) TP

MCC 2TL

MCC 2TH

Cas Bch 4160V B

Gas Bch 4160V A

SD-29 I Rev. 2 | of 85

I. -


.Power Supplies

-Component

CWOD Pump 1(2) A and B Exciter PowerSupply

CWOD Pump 1(2) C and D ExciterPower Supply

CWOD Pump 1(2) A and B Dischargevlvs

CWOD Pump 1(2) C and D Dischargevlvs

CWOD Lube Water Pump 1(2) A

CWOD Lube Water Pump 1(2) B

Power Suppl

MCC CWA Bus B

MCC CWA Bus A

MCC CWA Bus B

MCC CWA Bus A

MCC CWA Bus B

MCC CWA Bus A

I SD-29 I - Rev. 2 of 85

TABLE 29-3.1Page 1 of 3

Monitoring Instrumentation

FUNCTlON

CWIP 1(2) A Disch Press

CWIP 1(2) B Disch Press

CWIP 1(2) C Disch Press

CWIP 1(2) D Disch Press

Cond Waterbox 1(2) A-N InletLevel

Cond Waterbox 1(2) A-S InletLevel

Cond Waterbox 1(2) B-N InletLevel

Cond Waterbox 1(2) B-S InletLevel

Cond 1 (2)A-N Debris Filter DP

Cond 1 (2)A-S Debris Filter DP

Cond 1 (2)B-N Debris Filter DP

Cond 1 (2)B-S Debris Filter DP

CWOD Pump 1(2) A DischPressure

CWOD Pump 1(2) B DischPressure

CWOD Pump 1(2) C DischPressure

CWOD Pump 1(2) D DischPressure

INSTRUMENTDESIGNATION

1 (2)-CW-PI-515

1 (2)-CW-PI-516

1 (2)-CW-PI-517

1(2)-CW-PI-518

1 (2)-CW-LI-5979-1

1(2)-CW-LI-5979-2

1(2)-CWW-LI-5979-3

1(2)-CW-LI-5979-4

1(2)-CW-DPT-7094A

1 (2)-CW-DPT-7094B

1 (2)-CW-DPT-7094C

1 (2)-CW-DPT-7094D

1 (2)-CW-PI-1 127

1(2)-CW-PI-1 128

1 (2)-CW-PI-1 129

1 (2)-CW-PI-1 130

INDICATOR/RECORDER[OCATION

Local

Local

Local

Local

Local

Local

Local

Local

1 (2)-CW-PDI-519-1XU-2

1 (2)-CW-PDI-520-1XU-2

1 (2)-CW-PDI-521-1XU-2

1 (2)-CW-PDI-522-1XU-2

Local

Local

Local

Local

| SD-29 I - Rev. 2 | I of 85|




INDICATOR/RECORDERLOCATIONFUNCTION

1 (2)-TSP-PI-1011

1 (2)-TSP-PI-1014

1 (2)-TSP-PI-1015

1(2)-TSP-PI-1019

1(2)-TSP-PI-1 020

1 (2)-TSP-FM-0001

1 (2)-TSP-FM-0002

1 (2)-TSP-FM-0003

1 (2)-TSP-FM-0004

1 (2)-TSP-FM-0005

Pressure gauge at inlet offilters

Pressure gauge betweenfilters and pressure-reducing valve

Pressure gauge at outletof pressure-reducing valve

Pressure gauge at branchto inlet tube sheets

Pressure gauge at branchto outlet tube sheets

Flow meter at branch toinlet tube sheets

Flow meter at branch tooutlet tube sheets

Flow meter to inlet tubesheet (Unit 1, B South;Unit 2, B South)

Flow meter to outlet tubesheet (Unit 1, B South;Unit 2, A North)

Flow meter to inlet tubesheet (Unit 1, B North;Unit 2, B North)

Local

Local

Local

Local

Local

Local

Local

Local

Local

Local

-SD-29 Rev. 2 | of 85




INDICATOR/RECORDERLOCATIONFUNCTION

1 (2)-TSP-FM-0006

1 (2)-TSP-FM-0007

1 (2)-TSP-FM-0008

1 (2)-TSP-FM-0009

1 (2)-TSP-FM-0001 0

Flow meter to outlet tubesheet (Unit 1, B North;Unit 2, A South)

Flow meter to outlet tubesheet (Unit 1, A South;Unit 2, A South)

Flow meter to outlet tubesheet (Unit 1, A South;Unit 2, B North)

Flow meter to inlet tubesheet (Unit 1, A North;Unit 2, A North)

Flow meter to outlet tubesheet (Unit 1, A North;Unit 2, B South)

Local

Local

Local

Local

Local

| SD-29 I Rev. 2 - Page67of85

POINT

3

4

5

6

10

11

12

13

14.

15

16

TABLE 29-3.2Supervisory System Monitoring

FUNCTION PARAMETER

Indication CW Discharge Pump 1(2) A Breaker Position

Indication CW Discharge Pump 1(2) B Breaker Position

Indication CW Discharge Pump 1(2) C Breaker Position

Indication CW Discharge Pump 1(2) D Breaker Position

Indication Unit 1 (2) Bearing Lube Water Pump 1 Status

Indication Unit 1 (2) Bearing Lube Water Pump 2 StatusIndication Discharge Valve 1(2)-CW-V53 position

Indication Discharge Valve 1(2)-CW-V54 position



Alarm CWOD Pump 1(2) A Lube Water Low Flow17

18

19

20

21

22

23

24

25

26

27

Alarm

Alarm

Alarm

Alarm

Alarm

Alarm

Alarm

Alarm

Alarm

Alarm

Alarm

CWOD Pump

CWOD Pump

CWOD Pump

CWOD Pump

CWOD Pump

CWOD Pump

CWOD Pump

CWOD Pump

CWOD Pump

CWOD Pump

CWOD Pump

1(2) B Lube Water Low Flow

1(2) C Lube Water Low Flow

1(2) D Lube Water Low Flow

1(2) A Motor Overload

1(2) B Motor Overload

1(2) C Motor Overload

1(2) D Motor Overload

1(2) A Ground Current

1(2) B Ground Current

1(2) C Ground Current

1(2) D Ground Current33

34

39

40

50

52

Alarm

Alarm

Alarm

Alarm

Alarm

Alarm

Unit 1(2) Bearing Lube Pumps Low Pressure

LOCAL-REMOTE Switch in LOCAL position

CWOD Pump 1(2) A Motor High Temperature

CWOD Pump 1(2) B Motor High Temperature

CWOD Pump 1(2) C Motor High Temperature

CWOD Pump 1(2) D Motor High Temperature

I SD-29 | Rev. 2 7 of 85 |


Annunciators

Annunciators

CWIP Pump A Trip

CWIP Pump B Trip

CWIP Pump C Trip

CWIP Pump D Trip

CW Debris Filter High dP

CW Pump Lube Water Flow Low

Bearing Lube Water StrainerDifferential High

CW Trash Rack Diff High

Water Box Air Removal SysTrouble

Supervisory System Trouble

Tube Cleaning System Trouble

CW Disch Pump Motor Overload

CW Disch Pump Ground Current

CW Disch Motor RTD Temp Hi

CW Disch Pmp Lube Water FlowLow

CW Disch Pmp Lube Water PressLow

Disch Canal Level High/Low

Intake Canal Flood Level High

Unit(s)

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

AnnunciatorPanel Number

UA-01

UA-01

UA-01.

UA-01

UA-01

UA-01

UA-01

1

1and 2

and 2

UA-01

UA-03

1

2

1

111

and 2

only

and 2

and 2

and 2

and 2

UA-05

UA-05

UA-24

UA-24

UA-24

UA-24

1 and 2 UA-24

1

1and 2

and 2

UA-24

UA-24

I SD-29 .Rev.2 of 85


Annunciators

Annunciatam Unilt(s)

Tube Sh Press Cath Prot SysTrouble

Turbine Bldg E Cndr Pit FloodLevel Hi

Turbine Bldg NW Cndr Pit FloodLevel Hi

Turbine Bldg SW Cndr Pit FloodLvA Hi

1 and 2

1 and 2

AnnunciatorPanel NWumbe

UA-24

UA-28

1 and 2 UA-28

1 and 2 UA-28

SD-29 Rev. 2 - of 85 |


Instrument and Control Setpoints

INSTRUMENT TRIP FUNCTION INSTRUMENT INDICATOR/ TRIP SETPOINT AND FUNCTIONDESIGNATION RECORDER

CW Intake Pump A Lubo Water Flow 1 (2)-SW-FS-1 12 N/A 5.0 to 6.0 gpm - Trips CWIP A on Low Flow to Bearings. Ann Pnil UA-01decreasing

CW Intake Pump B Lube Water Flow 1 (2)-SW-FS-1 13 NIA 5.0 to 6.0 gpm - Trips CWIP B on Low Flow to Bearings. Ann Pnl UA-01decreasing

CW Intake Pump C Lube Water Flow 1 (2)-SW-FS-1 14 N/A 5.0 to 6.0 gpm - Trips CWIP C on Low Flow to Bearings. Ann Pnl UA-01decreasing.

CW Intako Pump D Lubo Walor Flow 1(2)-SW-FS-1 15 N/A 5.0 to 6.0 gpm - Trips CWIP D on Low Flow to Bearings. Ann Pnil UA-01decreasing

Intake Canal Level 1(2)-SCW-LT-285 1(2)SCW-LR-285/ 14-3- to 14-9 - Annunciator 'Intake Canal Flood Level High' on Ann. PnI.CW-LR-761 greater than UA-24

MSL Increasing

Dlschargo Canal Level 1(2)-CW-LT-761 1(2)SCW-LR-285/ High 5' - Annunciator 'Disch Canal Level High/Low' on Ann. Pnl.CW-LR-761 Increasing UA-24.

Low 3-10-decreasing

CW 1(2) A-N Debris Filter 1 (2)-CW-DPT-7094A 1 (2)-CW-PDI-519-1 80 inches - Annunciator 'CW Debris Filter High dP" on Ann. Pnl. UA-01Increasing

CW 1(2) A-S Debris Filter 1 (2)-CW-DPT-7094B 1 (2)-CW-PDI-520-1 80 inches - Annunciator 'CW Debris Filter High dP' on Ann. Pnl. UA-01increasing

CW 1(2) B-N Debris Filter 1 (2)-CW-DPT-7094C 1 (2)-CW-PDI-521-1 80 inches - Annunciator 'CW Debris Filter High dP" on Ann. Pnl. UA-01__increasing

CW 1(2) B-S Debris Filter 1 (2).CW.DPT-7094D 1 (2).CW-PDI.522-1 80 inches - Annunciator CW Debris Filter High dP" on Ann. Pnl. UA-01I_ I_ _increasing

SD-29 Rev. 2 of 85

TABLE 29-5Page 2of 4

Instrument and Control Setpoints


CW Disch Pump Lube Header Press 1 (2)-CW-PS-1 131 N/A 27 to 33 psig Starts Auto Lube Water Pumpdecreasing

1(2)-CW-PS-1 132 N/A 32 to 38 psig Annunciator ICW Disch Pump Lube Wtr Pressure Low' ondecreasing Ann. PnI. UA-24

CW Disch A Pump Lube Water Flow 1 (2)-CW-FS-1 117 N/A 6.5 gpm - Trips CWOD Pump A on Low Flow to bearings.decreasing

- Annunciator 'Lube Water Low Flow' on Ann. PnI. UA-24

CW Disch Pump B LubeWater Flow 1(2)-CW-FS-1120 N/A 6.5 gpm - Trips CWOD Pump B on Low Flow to bearings.decreasing


CW Disch Pump C Lube Water Flow 1 (2)-CW-FS-1 123 N/A 6.5 gpm - Trips CWOD Pump C on Low Flow to Bearings.decreasing


CW Disch Pump D Lube Water Flow 1 (2)-CW-FS-1 126 N/A 6.5 gpm - Trips CWOD Pump D on Low Flow to Bearings.decreasing

- Annunciator *Lube Water Low i low' on Ann. PnI. UA-24

I SD-29 I Rev. 2 1 . Page72of85


Instrument and Control Setpolnts


Hi Turbine Bldg CW Pipe Pit Flood 1X-LSH-3106 (E) N/A 10' Annunciator "Turb Bldg CW E Cndr Pit Flood Level Hi' onLevel - Unit 1 1X-LSH-3114 (NW) Increasing Ann. PnI. UA-28.

1X-LSH-3109 (SW)- Annunciator Turb Bldg CW NW Cndr Pit Flood Level Hi' on

Ann. Pnl. UA-28.

- Annunciator "Turb Bldg CW SW Cndr Pit.Flood Level Hi' onAnn. PnI. UA-28.

Hi-Hi Turbine Bldg CW Pipe Pit Flood 1X-LSHH-3107(E) N/A 60" - CW Intake Pumps High Flood Level (60") Trip Signal Input.Level - Unit 1 1X-LSHH.3115(NW) increasing

1X-LSHH-3112(SW)

HI-Hi Trip Turbine Bldg CW Pipe Pit 1X.LSHH-3108(E) N/A 108" - Trips CW Intake Pumps on Combination High-High FloodFlood Level - Unit 1 1X-LSHH-3205(NW) Increasing Level of 108- and a Confirmed High Flood Level of 60'.

1 X-LSHH-3113(SW) i

Hi Turbine Bldg CW Pipe Pit Flood 2X-LSH-3106 (E) N/A 10- Annunciator "Turb Bldg CW E Cndr Pit Flood Level Hi' onLevel - Unit 2 2X-LSH-3109 (NW) increasing Ann. Pnl. UA-28.

2X-LSH-3114 (SW)- Annunciator "Turb Bldg CW NW Cndr Pit Flood Level Hi' on

Ann. Pnl. UA-28.

- Annunciator 'Turb Bldg CW SW Cndr Pit Flood Level Hi" onAnn. PnI. UA-28.

Hi-Hi Turbine Bldg CW Pipe Pit Flood 2X.LSHH-3107(E) N/A 60" CW Intake Pumps High Flood Level (60") Trip Signal Input.Level - Unit 2 2X-LSHH-3112(NW) increasing

2X-LSHH-3115(SW)

2X-LSHH-3108(E) N/A 108" Trips CW Intake Pumps on Combination High-High FloodHi-Hi Trip Turbine Bldg CW Pipe Pit 2X-LSHH-3113(NW) Increasing Level of 108" and a Confirmed High Flood Level of 60-.Flood Level - Unit 2 2X-LSHH-3205(SW) .

SD-29 | Rev. 2 | of 85|


Instrument and Control Setpolnts


Tubesheet Pressurization High Filter 1(2)-TSP-PDS-1012 N/A 15 psid - Annunciator 'Tube Sht. Press. Cath. Prot. Sys. Trouble' onDifferential Pressure 1(2)-TSP-PDS-1013 Increasing UA-24.

Tubesheet Pressurization Low System 1 (2)-TSP-PS-1016 N/A 20 psig - Annunciator "Tube Sht. Press. Cath. Prot. Sys. Trouble' onPressure decreasing UA-24.

Tubesheet Pressurization High Inlet 1(2)-TSP-FSA-1017 N/A 1 gpm Annunciator 'Tube Sht. Press. Cath. Prot. Sys. Trouble' onTubesheet Flow . increasing UA-24.

Tubesheet Pressurization High Outlet 1(2)-TSP-FSA-1018 N/A I gpm - Annunciator 'Tube Sht. Press. Cath. Prot. Sys. Trouble' onTubesheet Flow Increasing UA-24.

* See Tables in SD 29.1, Screen Wash SD for further information on CWIP setpoints.

SD-29 Rev. 2 of 85

FIGURE 29-1Circulating Water System Unit 2

SD-29 Rev. 2 of 85

FIGURE 29-2Debris Filter Cross Section

EXHAUST FROMLP TURBINE

OF 2 F.W. HEATERS

BACK WASH-

PRESSURIZED.TUBE INLET

SHEET

DISCHARGE VALVE

FILTER

I SD-29 I Rev. 2 | of 85 |

FIGURE 29-3AMERTAP System Cross Section

tVATER INLETWAtER mUTLET

I _ _ ,

SD-29 Rev. 2 I Paae 77 of 85 IPaoe77of85I - - I

FIGURE 29-4AMERTAP System Unit 2

BALLSTRAINERS

RECIRCULATIONPUMPS

COLLECTORBASKETS

CONDENSERINJECTORS

CV FRY34

2B

2A


FIGURE 29-5AMERTAP Ball Collection Strainer

AIRFBIL-SECTION

THROTTLE SPONGE BALLS BEINGCAUGHT ON SCREENS INNORMAL OPERATINGPOSITION

I SD-29 Rev. 2 of 85

FIGURE 29-6Intake Canal General Arrangement

APPROX LOCATIONOF SNOWS MARSHCHANNEL RANGE

SD-29 Rev. 2 | Page80of85|

Cl)

0

CO~

133

DIKE

CD

rm

a0

CoCD

3 m

(Dr m

QI

-5

ID0

)CD

CD,

CASWELL BEACH

ATLANTICOCEAN

(0ID

co(D

00

CO)En

FIGURE 29-8Caswell Beach Pumping Station

. Layout

I -cz

| SD-29 I Rev. 2 | - of 851

(0

(D

c)

0tC)nm

SDm_.Co

CO

v

CD

.

la-o

5 G)

toCD

Cj)

00aU

CD

X

CD(C)

0coCn

FIGURE 29-10CWIP Characteristic Pump Curve

10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160

SD-29 Rev.2 of 85

FIGURE 29-11CWOD Pump Characteristic Pump Curve

0x

16 W

120LUCO)

E IY0

4 Lu

35UI.

3OZ

2n25 z

30 60 90 120 150 180 210 240

GALLONS PER MINUTE X 1,000


SD-29 CIRCULA TING WA TER SYSTEM

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