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PICKERING ‘A’ UNIT 4 BOILER 6 HOT SOURCE

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. >450,000 rem/h ESTIMATED CONTACT GAMMA DOSE RATE @ 1cm 18,000 rem/h @ 5cm

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PICKERING ‘A’ UNIT 4 BOILER 6 HOT SOURCE

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  1. PICKERING ‘A’UNIT 4 BOILER 6 HOT SOURCE Scott Cameron Pickering B RPM

  2. OUR GOAL The Elimination or Control of this Hazard will allow P941 Outage work to proceed safely while minimizing extra dose to workers.

  3. >450,000 rem/h ESTIMATED CONTACTGAMMA DOSE RATE @ 1cm 18,000 rem/h @ 5cm 500 rem/h @ 30cm manway Cold Leg Drain Line Hot Leg Drain Line 350 rem/h JUST BELOW HOT LEG DRAIN LINE PROBLEM STATEMENT High Energy Source Identified in the Cold Leg Drain Line of Unit 4, Boiler 6 Archived Photo Without Insulation On This is Boiler 12 Not Boiler 6

  4. AREA THAT SOURCE AFFECTS 29’ WPW wall 225 mrem/h 450 mrem/h 27’ btm strs 26’ top strs to feeders 12’ danceflr 40’ top of stairs 2900 mrem/h 2500 mrem/h 4500 mrem/h 35’ BO12-BO6 18’ to flange drain line 200 mrem/h

  5. >450,000 rem/h @ 1cm On Boiler Drain Line Elbow 500 rem/h @ 30cm 1” to 3” of insulation to get to drain line Boiler Base Pedestals BOILER - 6 CLICK HERE TO RETURN TO PREVIOUS SLIDE

  6. PICTURES OF AREA Drain Line Valve Under PHT Pumps Along HT Catwalk, Flanged Off.

  7. 200 mrem/h Perimeter Walk Way

  8. PICTURES OF AREA 2.5 rem/h at Surveyor Position Dance Floor

  9. TRIM VALVE PLATFORM CATWALK PERIMETER WALK WAY TRIM VALVE PLATFORM DANCE FLOOR

  10. OPTIONS • FLUSH AND CAPTURE • 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.

  11. OPTION DETAILS (cont’d) • 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.

  12. DRAWING OF FLUSH AND CAPTURE OPTION 2 CRANE SIDE VIEW BOILER 6 In Station Flasks With IX Column Inside TOTE TOTE 311’ B/R North Ice Plug Here For Double Isolation Hot Spot Cold Leg Drain Line Drain Valve 4-3311-V11 Drain Manifold Flanged Drain Line - 18ft

  13. PREREQUISITE ACTIVITIES • Draft Work Plan • Address assessing requirements • Develop and procure tooling • Set up mock up • Acquire resources • Train • Transfer of Particle Issues • Target Dates • Approval of Back-Up Schedule and Implementation

  14. RISKS a) Resources b) Timeline c) Cost d) Dose Assignment e) If particle has changed locations and no longer where we think it is

  15. OPTIONS FLOWSHEET FLUSH AND CAPTURE PARTICLE SHIELD BOILER 6 AS BEST AS POSSIBLE. MOVE TO EAST BOILERS AND LEAVE FOR NEXT OUTAGE 1041 OR CUT OUT IN PARALLEL ON 941. IS CAPTURE SUCCESSFUL? NO YES PROCEED WITH REGULAR OUTAGE SCOPE

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