Analytical study on specification design of artificial barrier system

Ishii, Takashi*; Kurihara, Yuji*; Sawauchi, Y.*; Sugihara, Yutaka*; Shimabe, Kenichiro*

A few analytical study were executed in order to submit predicted answer which would be referred in the PNC's "1992 report". First heat transfer analyses were done in addition to former studies. In case of sedimentary rock and the depth of GL-500m 80 marea will be needed for the layout of each waste form, and in case of crystalline rock and the depth of 1000m 100 m area will be needed. Far field heat transfer analyses were executed under conservative condition of heat transfer coefficient of ground surface is 10 kcal/m hC. The temperature of ground surface will not get higher than initial temperature. Secondly, analyses were done using "ABAQUS" and "DACSAR" in order to predict settlement of a waste form in buffer material. The predicted. The predicted settlement by ABAQUS is 0.92mm and by DACSAR is 2.70mm. These displacement will be acceptable. Additionally the influence of swelling of overpackage resulted from corrosion of steel was discussed. According to the preliminary analyses for predicting stress of rock around a waste from, 300mm thick buffer material will be not enough to relaxation of the stress but 1000mm thick buffer material will be enough. Technical meetings were held 7 times in order to discuss these analytical results and design of repositories etc.