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Nuclear waste canister corrosion studies pertinent to geologic isolation

1980; Elsevier BV; Volume: 1; Issue: 1 Linguagem: Inglês

10.1016/0191-815x(80)90027-3

1878-2027

J.W. Braithwaite, Martin A. Molecke,

Concrete Corrosion and Durability

The compatibility of candidate high-leve nuclear waste (HLW) canister materials with deep geologic isolation environments is addressed. Results are presented which are applicable to both bedded salt and sub-seabed sediment repositories or test facilities. Such studies are an essential portion of the technological basis for terminal waste management. These studies will be used to identify HLW canister or overpack materials satisfying appropriate requirements for barrier lifetime. Mechanical properties, as well as constraints on cost and consumption of critically limited materials, are also selection criteria. Lifetime objectives range from a minimum of several years for retrievability constraints up to several hundred years for retardation of near-field interactions (e.g., waste form leaching with potential radionuclide release to the geosphere) during the period of greatest HLW thermal output. A review of present and prior applicable corrosion results is presented. However, emphasis is on the results obtained from current laboratory HLW canister/ corrosion programs at Sandia Laboratories. The effects of multiple variables on corrosion susceptibility and rates are briefly discussed and some applicable data given. It is possible to provide a canister/ overpack barrier which can survive geologic isolation environments for periods of several hundred years.