Chemical Volume and Control Chemical Volume and Control SystemSystem
Chapter 5.0
Learning ObjectivesLearning Objectives
1. List the purposes of the chemical and volume control system (CVCS).
2. List in flow path order and state the purpose of the following major components of the CVCS:
a. Regenerative heat exchangerb. Letdown flow control valvesc. Letdown heat exchangerd. Letdown back pressure regulatore. Letdown filterf. Ion exchangersg. Volume control tank (VCT)h. Charging pump
Learning ObjectivesLearning Objectives
3. Identify the components in the CVCS that are used to purify the reactor coolant and the types of contaminants each is designed to remove.
4. Describe how the makeup system is used to borate, dilute, and makeup a blended flow of boric acid to the reactor
l t t (RCS)coolant system (RCS).
5. Explain why and for what plant conditions the following chemicals are added to the RCS:
a. Lithium hydroxideb. Hydrogenc. Hydrazine
Learning ObjectivesLearning Objectives
6. Describe the emergency boration flowpath,
and identify the plant conditions which would require its use.
7 List the plant operations that result in large amounts of in7. List the plant operations that result in large amounts of in fluent into the boron management system.
8. Identify the changes in the CVCS that occur upon the receipt of an engineered safety features signal (ESF).
Learning ObjectivesLearning Objectives
9. Explain how the CVCS is designed to prevent the following:
a. Flashing and pressure transients in the regenerative and letdown heat exchangers.
b. High temperature in the letdown ionb. High temperature in the letdown ion
exchangers
10. List the automatic actions initiated by VCT level instrumentation.
System PurposesSystem Purposes
1. Purification of the RCS,
2. Control of RCS boron concentration,
3. Control of RCS volume (pressurizer level),
4. The addition of corrosion inhibiting chemicals to the RCS,
5. Collection of RCP controlled bleed off,
System PurposesSystem Purposes
6. Adds boron to the RCS in the event of an accident,
7. Supplies pressurizer auxiliary spray,
8. Provides continuous on-line measurement of RCS boron concentration and RCS activity and
9. Provides a means of testing the high pressure safety injection (HPSI) check valves.
Figure 5-2 CVCS Diagram
R
B
LetdownFilters
From SDC
WPS205 PSIG
F
CV-201Q
CV-201P
145°F
120°F
T P
T
460 PSIG
600 PSIG
WPS
70 PSIGWPS
CV-506
CV-183
AB
CBCV-518
CV-519
CV-517395°F
T
Aux Spray
"11A" RCP
"12B" RCP
544.5°F
CV-515 CV-516
470°F
263°F
T
Regen HeatExchanger
CB AB
FromRCPs
CV-110Q
CV-110P
LetdownFlow
Control
CV-521
To SDCCV-500
Back PressureRegulators
CCW
CV-223
ExcessFlow
CheckValve
VCT
11
12
13
Typical
ChargingPumps
ChemicalAddition
CV-504
RWT
BAMU Tanks
CV-501
80 PSIG
WPS
MakeupSystem
Deb
orating
Mixe
d Be
d
Mixed
Bed
Demineralizers
CV-520
LetdownStrainer
CV-505 H2/N2
Waste GasSystem
WPS
HPSI
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