Costs and Impacts of Retrieval and Processing of Wastes from Selected Single-Shell Tanks

摘要

This report determines the costs of retrieval and processing of wastes from selected Hanford Site underground single-shell tanks and the impacts of retrieval on waste pretreatment operations, grout, and glass production. Retrieval options were chosen based on projected transuranic element inventory and transuranic element concentration in wastes in single-shell tanks. Retrieval options range from as few as one single-shell tank to as many as 116 tanks. Waste is assumed to be removed from single-shell tanks using mechanical retrieval equipment. The feed pretreatment steps include dissolution of the salt cake and separation of the sludge and dissolved salt cake by centrifugation. The sludge is washed with water to assure dissolution of soluble salts. Organic complexants are destroyed in waste from certain single-shell tanks by ozonization of the dissolved salt cake. The dissolved salt cake is converted to a cementitious grout form for near-surface disposal in concrete vaults. The washed sludge is converted to borosilicate glass for disposal in a deep geologic repository. 3 refs., 1 fig., 9 tabs. (ERA citation 12:028410)