| Budget Amount *help |
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥11,830,000 (Direct Cost: ¥9,100,000、Indirect Cost: ¥2,730,000)
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| Outline of Final Research Achievements |
Bentonite can be expected as a filling material between the canister of radioactive waste and surrounding underground geological deposit in the engineering barrier system. In this study, two kinds of bentonite materials such as granular bentonite under different humidity and packed conditions and block bentonite were used to characterize the microstructure using a microfocus X-ray CT system and to evaluate mass transport parameters for developing predictive models. Results showed that the homogeneous process of bentonite was quantified based on the temporal change in the ratio of coarse and fine grains, and both gas diffusion coefficient and air permeability of granular bentonite were evaluated well by using the predictive models considering effective air-filled porosity. These results can be expected to incorporate with the mass transfer dynamics of filling materials and to contribute to the evaluation of long-term safety of engineering barrier system.
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