BGRR D&D Presentation for the DOE ERAD Working Group...25’ Cube of graphite 1.4 million lb • ~...
Transcript of BGRR D&D Presentation for the DOE ERAD Working Group...25’ Cube of graphite 1.4 million lb • ~...
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BGRR D&D Presentation for the DOE ERAD Working Group
Terri Kneitel, PE, PMP
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Brookhaven Graphite Research Reactor (BGRR) -- History
First reactor built solely for peaceful research • Operated 1950 – 1968
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BGRR Graphite Pile Details 25’ Cube of graphite
1.4 million lb • ~ 60,000 graphite blocks • 75 layers of 4” square graphite blocks of
varying length
Total Activity 787 Ci
• Predominantly Carbon-14 • Also some Nickel-63 and Tritium
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BGRR Bioshield Details •Constructed of steel and high density limonite concrete containing scrap iron
• Shield – 55 ft long by 37.5 ft wide by 33.5 ft high
• Proceeding from graphite outward - 6 inches steel plate, 4 ft 3 inches high density concrete, and outer 3 inches steel plate
• ~ 10 million lb of steel
and concrete
• 81 Ci primarily Ni-63,
H-3 and Co-60
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Contamination Control Enclosure (CCE)
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Control Trailer
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Entrance to CCE
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Remote Graphite Removal Equipment
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Equipment for Graphite Removal
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Remote viewing from outside controlled area
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CCE was HEPA Filtered and Monitored
• No particulates detected
• Total 0.34 curies in 2011
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0
500
1000
1500
2000
2500
40548 40579 40607 40638 40668 40699 40729 40760 40791 40821
2011 BGRR Emissions of Tritium pCi/cubic meter
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Graphite Removal
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Use of fixative for dust/contamination control
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Graphite Removal (video)
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Transfer of Graphite to Supersack (Video)
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Moving Supersack with Graphite to Package
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Transfer of Supersack to Box (video)
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Box Sealed and Clipped
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~ 250 boxes of graphite Typical box of graphite: ~ 65 mR/hr on contact ~ 0.8 mR/hr at 20 feet
Hottest box of graphite had a spot
~ 7.8 R/hr on contact ~ 1.4 R/hr at 1 foot ~ 300 mR/hr at 1 meter
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Shielded Multi-Use Type A Container (SMAC)
Used shielded packages for boxes with elevated dose readings • Expect ~10 boxes
greater then 1 R/hr on contact
SMAC capable of shielding up to 7 R/hr 19
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First Graphite Shipment – February 24, 2010
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5 to 6 boxes per truck depending on weight Curtains provide for closed transport vehicle – if required
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Excavator Hammer at West Wall
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Wall Cutting with Robot
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Not all work was able to be done remotely
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Excavator in the Bioshield
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Installation of Concrete Cap over Remaining Base Plates
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Final Concrete Cap Placement
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The addition of 3” of concrete resulted in a dose rate of <0.1 mR/hr (0.01 to 0.08 mR/hr) at waist high from the bioshield cap
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Total Dose for BGRR D&D 2009 - 2012 Final Dose Estimate
(person-rem) Actual EPD Dose
(person-rem) Graphite Removal 4.6 2.3
Bioshield Removal 12.1 9.5
Total 16.7 11.8
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ERP 2007 BGRR Dose Estimate (person-rem)
B&R 2003 BGRR Dose Estimate (person-rem)
Pile Preps 0.3 -
Pile Removal 7.6 26.7
Bioshield Preps
and Removal –
13.9 19.1
Project Total 21.8 45.8
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BGRR As-Left Survey - Radiation
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General Area Dose Rates (mrem/hr) Maximum General Area Dose Rates
Location Expected
condition *
As-left conditions As-left conditions
Deep pit 10-30 8 - 15 80
High bay <0.1 <0.01 <0.02
High bay on top of biological shield cap
<0.1 0.01 – 0.07 0.08
Office areas background background background
Yard areas background background background
BGD general area 5 1 - 10 20
South BGD beyond radiation trap
30 1 - 4 5
North BGD below exhaust air plenum
100 - 150 2 - 20 50
* BGRR Decommissioning End Points
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BGRR As-Left Survey - Contamination General Area Contamination Levels loose beta/gamma (alpha) (dpm/100cm2)
Maximum Area Contamination
Deep pit 1,000 – 2,500 1,000 – 5,000 (<20 – 100) 20,000 (724)
High bay – accessible areas (up to 6’)
<1,000 <1,000 (<20) <1,000 (28)
High bay – remote/inaccessible areas (Gantry crane, excavator, support structure, bldg crane and roof supports)
<3,000 West catwalk - <3,000 (<20) Gradall - <1,000 (<20) Truss #2 - <3,000 (<20) NW Column - <3,000 (<20) Gantry - <3,000 (<20) East catwalk - <3,000 (<20) Charging Elev. - <1000 (<20)
1,000 (<20) 500 (<20) 8,600 (33)
1,000 (<20) 7,700 (34) 12,000 (25) 2,800 (<20)
High bay – pile support plate (prior concrete cap)
<10,000 <1,000 (<20) <1,000 (<20)
Office areas background background background
Yard areas background background Background
BGD inboard of bustle 7,000 3,000 (<20) 76,000 (132)
North BGD exh air plenum 16,000 8,000 (<20) 16,800 (207) 30
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Annual Area TLD Monitoring Results Location 2009
Results (mrem)
2010 Results (mrem)
2011 Results (mrem)
Bldg 701 Occupied Areas 8 5.2 3.8
Bldg 703 Occupied Areas 6.7 6.2 5.8
Bldg 701 Non Occupied Areas
1.5 20.1 40.6
Bldg 703 Non Occupied Areas
2.3 14.3 25.2
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Goal was to be <15 mrem/yr in occupied areas
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BGRR Contaminated Soil & Subsurface Structures, View to North
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Final Status Survey Results
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BGRR Final Conditions
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