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Report No.

Development of evaluation code for microbial effect on HLW disposal, 2; Sensitivity analysis of microbial colloid effects on radionuclide transport by COLFRAC

Ise, Kotaro; Ito, Tsuyoshi; Amano, Yuki; Yoshikawa, Hideki

To evaluate microbial colloid-facilitated radionuclide transport in fractured porous media, we conducted sensitivity analyses using a two dimentional numerical code, COLFRAC-mrl. The targeted domain is 100 $$times$$ 0.2 m granitic rock which contain strait fracture in the center. The fracture aperture was set to 1.18$$times$$10$$^{-3}$$ m and groundwater velocity in the fracture was set to 50 m/y. The results of sensitivity analyses showed that if there are microbe in the order of 10$$^{10}$$ cells/L in the groundwater, these microbe have possibilities to facilitate radionuclide transport.



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