Japan's efforts to develop performance assessment models for waste glass corrosion

Mitsui, Seiichiro  

In order to develop robust performance assessment models on waste glass corrosion, JAEA has been conducting experimental studies and has been preparing an information basis regarding the near-field processes under disposal conditions. To determine silicon migration parameters such as distribution coefficient of Si in buffer material, we conducted percolation type migration experiments and batch sorption experiments using Si-32 as radioactive tracer for Kunigel-V1 as a joint project with SCKCEN. The values of the apparent diffusion coefficient and the distribution coefficient of dissolved silica in Kunigel-V1 are estimated to be 3.4 10 /s and 0.5 /kg on average, respectively. The preparation of the information basis has been conducted as a part of joint project with NUMO. Based on the information basis, we developed a preliminary model of the glass corrosion considering the near-field processes and conducted sensitivity analyses for selected processes.