PICKERING AUNIT 4 BOILER 6 HOT SOURCEScott 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 STATEMENTHigh 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

AREA THAT SOURCE AFFECTS200 mrem/h

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PICTURES OF AREADrain Line Valve Under PHT Pumps Along HT Catwalk, Flanged Off.

Perimeter Walk Way200 mrem/h

PICTURES OF AREADance Floor2.5 rem/h at Surveyor Position

CATWALKDANCE FLOORTRIM VALVE PLATFORMTRIM VALVE PLATFORMPERIMETER WALK WAY

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 OUTAGEOR

3. DEVELOP PLAN FOR CUT OUT DURING THIS OUTAGE IF TIME PERMITS.

OPTION DETAILS (contd)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 doesnt 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 2In Station Flasks With IX Column InsideIce Plug Here For Double Isolation

Drain Manifold FlangedDrain Valve 4-3311-V11Drain Line - 18ftCRANE311 B/R NorthTOTEHot Spot Cold Leg Drain LineTOTESIDE VIEW BOILER 6

PREREQUISITE ACTIVITIESDraft Work Plan Address assessing requirementsDevelop and procure toolingSet up mock upAcquire resourcesTrainTransfer of Particle IssuesTarget DatesApproval 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 PARTICLEYESIS CAPTURE SUCCESSFUL?PROCEED WITH REGULAR OUTAGE SCOPENOSHIELD BOILER 6 AS BEST AS POSSIBLE. MOVE TO EAST BOILERS AND LEAVE FOR NEXT OUTAGE 1041 OR CUT OUT IN PARALLEL ON 941.