The Hanford Tanks Environmental Impacts and Policy Choices (1996) / Chapter Skim
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9 Appendix B: Description of Alternatives
9 Appendix B: Description of Alternatives
Pages 67-74
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From page 67... ...
LONG-TERM MANAGEMENT The tank farms would be managed consistent wig current waste management programs, wig monitoring for only 100 years to provide a consistent basis for assessing heady and environmental Impacts. The double-shell tanks would be replaced wad 26 new ones as needed, presumably at Me end of Be existing tank design life of approx~nately 50 years.
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From page 68... ...
IN SITU VITRIFICATION All pumpable liquids from double-shell tanks would be evaporated, and the concentrates would be returned to the tanks. The condensate would be routed to the Hanford Site 200 Area Effluent Treatment Facility, where effluents would be treated to meet currently applicable discharge limits.
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From page 69... ...
In the version evaluated in He DENS, approximately one-half of the tanks would be treated ex situ, based on an evaluation of treatment alternative on a tank-by-tank basis. The retrieved wastes would be treated according to the ex situ Intermediate treatment altemative, while the tanks with wastes not retrieved would be treated according to He In situ fill and cap alternative.
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From page 70... ...
However, He final waste forms may not meet geologic disposal waste acceptance cntena. EX SITU INTERMEDIATE SEPARATIONS As much of the waste as practicable would be removed from the tanks and separated into high-level and low-activity (Iow-level)
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From page 71... ...
In addition, many mechanical features of this alternative have not been demonstrated. EX SITU EXTENSIVE SEPARATIONS This alternative is similar to the ex situ intermediate separations alternative, but with additional, extensive separations to remove components of the high-level sludge from recovered tank wastes.
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From page 72... ...
Concentrated sodium nitrate and aluminum nitrate solutions may be purified by crystallization. Subsequent operations would parallel those for the ex situ intermediate alternative operations.
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From page 73... ...
would be removed from bow s~ngle-shell and double-shell tanks. Sludge washing, caustic leaching, ion exchange, and other separations "as required" would be used to separate He tank wastes into high-level and low-activity wastes.
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