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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

PICKERING ‘A’UNIT 4 BOILER 6 HOT SOURCE

Scott Cameron

Pickering B RPM

our goal
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

>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

slide4

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

slide5

>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

pictures of area
PICTURES OF AREA

Drain Line Valve Under PHT Pumps Along HT Catwalk, Flanged Off.

slide7

200 mrem/h

Perimeter Walk Way

pictures of area1
PICTURES OF AREA

2.5 rem/h at Surveyor Position

Dance Floor

slide9

TRIM VALVE PLATFORM

CATWALK

PERIMETER WALK WAY

TRIM VALVE PLATFORM

DANCE FLOOR

options
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.
option details cont d
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.

slide12

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

prerequisite activities
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
slide14

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
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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