Function for controlling nuclide migration of buffer material in the geological disposal for high-level radioactive waste

Sato, Haruo

Among the properties for controlling radionuclide migration of bentonite which is used as a buffer material composing engineered barriers for the geological disposal of high-level radioactive waste, studies on the water penetration, swelling, chemical buffering and nuclide migration retardation properties reported so far were reviewed. Additionally, what was clarified at the moment and future extension were summarized. After 2000, studies for saline groundwater conditions have been powerfully conducted, and it is understood that saline groundwater conditions affect all properties described above. Continuing these studies in the future, studies on the long-term behaviour considered the effect of alteration are necessary.