PICKERING A UNIT 4 BOILER 6 HOT SOURCE Scott Cameron Pickering B RPM.
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Transcript of PICKERING A UNIT 4 BOILER 6 HOT SOURCE Scott Cameron Pickering B RPM.
PICKERING ‘A’UNIT 4 BOILER 6 HOT SOURCE
Scott Cameron
Pickering B RPM
OUR GOAL
The Elimination or Control of this Hazard will allow P941 Outage work to proceed safely while minimizing extra dose to workers.
PROBLEM STATEMENT
High Energy Source Identified in the Cold Leg Drain Line of Unit 4, Boiler 6
>450,000 rem/h ESTIMATED CONTACT
GAMMA DOSE RATE @ 1cm18,000 rem/h @ 5cm500 rem/h @ 30cm
350 rem/h JUST BELOW HOT LEG
DRAIN LINE
Hot Leg Drain Line
Cold Leg Drain Line
manway
Archived Photo Without Insulation On This is Boiler 12 Not Boiler 6
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AREA THAT SOURCE AFFECTS
40’ top of stairs
27’ btm strs
29’ WPW wall
26’ top strs to feeders
35’ BO12-BO6
18’ to flange drain line
12’ danceflr
2900 mrem/h
450 mrem/h
2500 mrem/h
225 mrem/h
4500 mrem/h
200 mrem/h
CLICK HERE TO RETURN TO
PREVIOUS SLIDE
>450,000 rem/h @ 1cm On Boiler Drain Line Elbow
500 rem/h @ 30cm
Boiler Base Boiler Base Pedestals Pedestals BOILER - 6BOILER - 6
1” to 3” of insulation to get to drain line
PICTURES OF AREAPICTURES OF AREA
Drain Line Valve Drain Line Valve Under PHT Pumps Under PHT Pumps Along HT Catwalk, Along HT Catwalk, Flanged Off.Flanged Off.
Perimeter Perimeter Walk WayWalk Way
200 mrem/h
PICTURES OF AREAPICTURES OF AREA
Dance Floor
2.5 rem/h at Surveyor Position
CATWALK
DANCE FLOOR
TRIM VALVE PLATFORM
TRIM VALVE PLATFORM
PERIMETER WALK WAY
OPTIONS
1. FLUSH AND CAPTURE
2. IF FLUSH AND CAPTURE FAILS: 1) SHIELD BOILER 6 (USING LONG HANDLED TOOLS, ROPES) 2) RUN PARALLEL PLAN TO DO WORK ON EAST SIDE, DEVELOP PLAN FOR CUT OUT DURING P1041 OUTAGE
OR
3. DEVELOP PLAN FOR CUT OUT DURING THIS OUTAGE IF TIME PERMITS.
OPTION DETAILS (cont’d)
1. FLUSH AND CAPTURE
OPERATIONAL METHOD:
Forced drain to a shielded catch container (particle will progress in drain line/drain hose to two IX Columns in parallel.
Risk-particle doesn’t move
Contingency- See Option 2 Above
Risk- Particle becomes lodged on route in steel line drain line before reaching tygon hose.
Contingency- Shield (depending on location). Continue with boiler campaign on west side, develop plan for next outage to cut out.
DRAWING OF FLUSH AND CAPTURE OPTION 2
In Station Flasks With IX Column
Inside
Ice Plug Here For Double Isolation
Drain Manifold Flanged
Drain Valve 4-3311-V11
Drain Line - 18ft
CRANE
311’ B/R North
TOTE
Hot Spot Cold Leg Drain Line
TOTE
SIDE VIEW BOILER 6
PREREQUISITE ACTIVITIES
1. Draft Work Plan
2. Address assessing requirements
3. Develop and procure tooling
4. Set up mock up
5. Acquire resources
6. Train
7. Transfer of Particle Issues
8. Target Dates
9. Approval of Back-Up Schedule and Implementation
RISKS
a) Resources
b) Timeline
c) Cost
d) Dose Assignment
e) If particle has changed locations and no longer where we think it is
OPTIONS FLOWSHEET
FLUSH AND CAPTURE PARTICLE
YES
IS CAPTURE SUCCESSFUL?
PROCEED WITH REGULAR OUTAGE
SCOPE
NOSHIELD BOILER 6 AS BEST AS POSSIBLE.
MOVE TO EAST BOILERS AND LEAVE FOR NEXT OUTAGE 1041 OR CUT OUT IN PARALLEL ON 941.