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Report No.

Data acquisition on migration of radionuclides under deep geological environments

Iida, Yoshihisa ; Taki, Hiroshi; Yamaguchi, Tetsuji ; Tanaka, Tadao ; Negishi, Kumi; Nakayama, Shinichi 

A variation in data should be quantitatively incorporated in a probabilistic safety assessment of radioactive waste disposal. We focus our experimental efforts on parameters that induce major uncertainties in the radionuclide migration analysis and that have not been quantitatively assessed. Possible sources of uncertainty includes increase in ionic strength of groundwater caused by intrusion of seawater and/or dissolution of sodium nitrate in TRU waste, highly alkaline conditions originating from cementitious materials, and a variation of porewater composition accompanied with corrosion of. This study is a summary of current status of our investigations for solubility and diffusion.



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