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
Pickering B RPM
The Elimination or Control of this Hazard will allow P941 Outage work to proceed safely while minimizing extra dose to workers.
18,000 rem/h @ 5cm
500 rem/h @ 30cm
Cold Leg Drain Line
Hot Leg Drain Line
350 rem/h JUST BELOW HOT LEG DRAIN LINEPROBLEM 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
29’ WPW wall
27’ btm strs
26’ top strs to feeders
40’ top of stairs
18’ to flange drain line
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
Drain Line Valve Under PHT Pumps Along HT Catwalk, Flanged Off.
Perimeter Walk Way
2.5 rem/h at Surveyor Position
PERIMETER WALK WAY
TRIM VALVE PLATFORM
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.
SIDE VIEW BOILER 6
In Station Flasks With IX Column Inside
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
d) Dose Assignment
e) If particle has changed locations and no longer where we think it is
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?
PROCEED WITH REGULAR OUTAGE SCOPE