[en] The Central Research Institute of Electric Power Industry has carried out the project research for establishing the storage and disposal techniques for high level radioactive wastes. In this study, as a part of the research on the examination of the techniques for evaluating the performance and safety of artificial barriers, in order to evaluate the soundness and safety of high level glass solidified bodies and the canisters which are their containers, the test on the soundness and safety of glass solidified bodies, and the test on the durability of canisters were carried out, and based on those knowledges, a nuclide migration simulation model was made to evaluate nuclide migration, so far. The basic properties of glass solidified bodies such as transition point, softening point, devitrification temperature and crystallization were investigated, and glass must be kept below 500 deg C to prevent these phenomena. The migration speed of neptunium (Np), of which the danger index is the highest and the half value period is long, in glass was examined, and it was found that Np is an element which is hard to move in glass. The results obtained were used as the source data for making the nuclide migration evaluation code ''STRAG''. The damage of canisters by the reaction with molten glass was negligibly small. (Kako, I.)