Approximately 330,000 motric tons of sodium-rich radioactive waste originating from separation of plutonium from irradiated uranium fuel are stored in underground tanks at the U.S. Department of Energy (DOE) Hanford Site in Washington State. Fractionation of the waste into low-level waste (LIN) and high-level waste (HLW) streams is envisioned via partial water dissolution and limited radionuclide extraction operations. Under optimum conditions, LLWwould contain most of the chemical bulk while HLWwould contain virtually all of the transuranic and fission product activity. The fractionation will be followed by production of durable waste forms (e.g., glass) for separate long-term storage of LLWand HLWfractions. Under this fractionation scheme, the water-insoluble solids, including insoluble radionuclides plus soluble radionuclides separated from the LLW fraction, will go tothe HLWfraction. Calcination at around 850 =C, followed by water dissolution, has been proposed as an alternative initial treatment of Hanford Site waste to improve • waste dissolution and the envisioned LLW/HLWsplit. Results of literature and laboratory studies are reported on the application of calcination/dissolution (C/D) to the fractionation of the HanfordSite tank waste inventory. Both simulated and genuine HanfordSite waste materials were used in the lab tests.

Telephone: (703) 487-4650 A-6001-400.2 (09/94) WEF256 'SUPPORTIN G"DC)CUMENT TEST PLAN FOR PHASE I1 OF THE RETAINED GAS SAMPLER WHC-SD-WM-TP-328 SYSTEM-1 1. Total pages 38 0 4. Rev No.

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