Test manufacturing study of copper canisters for composite overpack

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In study and development of high-level radioactive waste geological disposal, engineering study is being carried out on design, manufacturing, and installation of the engineering barrier to clarify the engineering method that can ensure performances necessary for the engineering barrier. For the overpack, which is one of composition elements of the engineering barrier, at present there are two conceptions; i.e. a carbon steel overpack (of simplex carbon steel construction) and a composite overpack (of two-layer construction having a carbon steel inside for strength and titanium, copper, or others outside for corrosion resistant). Studies are being carried out on them from the viewpoints of their respective functions and manufacturing. For the carbon steel overpack, development elements in manufacturing technology have already been extracted through manufacturing full-scale models. In this entrusted study, we carried out some tests to obtain informations about applicability of some manufacturing method, through manufacturing of full-scale copper canister model which established in the manufacturing method study of last year.