Migration behavior of materials in clay buffer materials in geological disposal of high-level radioactive waste and migration-controlled corrosion of iron

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For the safety assessment of the geological disposal, it is necessary to understand the corrosion behavior of iron in bentonite buffer material and identify important parameters to affect the corrosion. In this study, corrosion of iron and migration of ions in compacted bentonite under electrical gradient were studied. In addition, hydraulic property of sedimentary rock sample was studied by conducting hydraulic conductivity measurement and X-ray micro CT observation of the rock sample. Hydraulic conductivity measurements were also made for Fe(II)-montmorillonite to understand the effect of the alteration of bentonite on the performance as the buffer material.