This report presents technical data and performance characteristics of a high-level waste glass and canister intended for use in the design of a complete waste encapsulation package suitable for disposal in a geologic repository. The borosilicate glass contained in the stainless steel canister represents the probable type of high-level waste product that will be produced in a commercial nuclear-fuel reprocessing plant. Development history is summarized for high-level liquid waste compositions, waste glass composition and characteristics, and canister design. The decay histories of the fission products and actinides (plus daughters) calculated by the ORIGEN-II code are presented • iii
Waste is Incorporated in a very du rable mater ial. ENGIN EERED BARRIERS-Con tain ers th at will minimize contact between the waste and geologic barriers for ma ny yea rs. GEO LOGIC BARRI ERS-Deep underground waste burial will provid e isolation from the environment. FIGUR E 1. The Mul t i barrier Concept for Isol ati ng High-Leve l Waste are con cerns as t o whether such a l arge glass form is a su itab le waste form. Therefore, other wa ste forms that may have more des i r able characteristics are be i ng co nsi dered. Following the solidification of HLLW, the waste (which is contained in storage canisters) will be transferred to a storage facility located onsite. The storage facility may be comprised of water basins, air-cooled vaults or concrete surface-silos. Storage conditions will be controlled to prevent the deterioration of the waste form. However, both deterioration and canister failure are expected, and provisions will be made for installing overpacks on any or all canisters before shipping. Overpacks will meet the performance criteria of primary canisters. Spent fuel and solidified HLLW may be stored in the same facility. Canisters delivered to the storage facility will meet the acceptance criteria of the storage facility as well as those for shipping and disposal in a federal repository. Acceptance criteria will include the following: • The waste canister will be a maximum of 0.60 m in 00 and 3 m in length. • The waste canister will be constructed of 304L stainless steel or a similar material. 16 .
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