Tank Waste Retrieval, Processing, and On-site Disposal at Three Department of Energy Sites Final Report (2006) / Chapter Skim
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VI Performance Assessment
VI Performance Assessment
Pages 72-83
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From page 72... ...
current plans that the Department should consider to ensure that its plans to manage its radioactive waste streams will The performance assessment that is used to seek approval comply with the performance objectives of Part 61 of Title 10, for disposal plans may be somewhat different from other Code of Federal Regulations; .
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From page 73... ...
and the separated low-activity waste from the the absolute numerical results, including the numerical pre- tanks (at the Savannah River Site and Hanford)
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From page 74... ...
The committee has made no intruder scenarios remain. An additional concern about the judgment whether DOE's current tank closure plans now combined inventory estimated to remain in the tanks at meet the performance objectives, which is a regulatory deci- Savannah River Site has arisen since the committee issued its sion.
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From page 75... ...
DOE must ensure that people in the controlled The first Savannah River Site tanks selected for closure area (even after the period of institutional control) would not do not contain some important complicating factors that affect tank cleaning, such as extensive vertical cooling coils (although they do contain zeolite)
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From page 76... ...
, which includes both the F ment and composite analysis [based on] the results of data and H Tank Farms, and the Z Area Saltstone Disposal Facility, where tank wastes will remain, in addition to the Defense Waste Processing Facility, the Old Burial Ground, the E Area low-level waste disposal facilities, and the 4"The point of compliance shall correspond to the point of highest canyons themselves (see Appendix J)
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From page 77... ...
and Savannah River Site (SRS) Long Range Com- River Site tank farms afford the lower, intruder level of proprehensive Plan.
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From page 78... ...
. tions of Np-237.6 All of the doses are within the limits for intruders described in the guidance for implementing the performance objectives, although the higher concentrations of neptunium- 6DOE notes that the addition of the laboratory waste was not tracked in 237 and technetium-99 in the Barnwell-McBean Aquifer at the waste characterization system (WCS)
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From page 79... ...
Table VI-3 shows the tanks. As future tanks are closed, the mass of the residual data from the Savannah River Site High Level Waste Tank materials will be adjusted as necessary for those tanks Closure Environmental Impact Statement (DOE-SRS, 2002, and the predicted radionuclide inventories at closure will Table C.3.1-2 in Appendix C)
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From page 80... ...
. known about the actual tanks and their contents, and on what The 2003 performance assessment used a conservative is known about the effectiveness of the tank waste removal estimate of the radionuclide inventory in the tank heels, technologies that DOE plans to employ in those tanks (see because the Idaho National Laboratory had yet to develop Chapter III)
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From page 81... ...
The committee commends DOE and others groundwater flow model that extends from the ground involved for seeking peer review. surface to the Snake River Plain aquifer and a detailed Just as the Savannah River Site has the Saltstone Disgeochemical model of the near-surface zone.
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From page 82... ...
the different possible waste forms for the reasoning. The dramatic improvement reinforces the comsupplemental low-activity waste treatment.8 The results of mittee's judgment concerning the value of independent peer the update are presented in Table VI-5.
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From page 83... ...
tions change and as DOE's knowledge of site conditions and other factors improves. Recommendation VI-3: DOE should base its projections of future residual inventories on what is known about the actual Finding VI-2b: Considering the range of assumptions, the tanks and their contents, and on what is known about the limitations of predictions regarding engineered systems with effectiveness of the tank waste removal technologies that a finite design life in dynamic environments, the challenges DOE plans to employ in those tanks.
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