Presentation Information
[1B03]A Study on the Methodology for Rational Treatment/Disposal of Contaminated Concrete Waste Considering Volume Reduction of Waste(7)Numerical evaluation of nuclide mobilization
*JUNXIAO LIU1, Katsufumi HASHIMOTO1, Takafumi SUGIYAMA1 (1. Hokkaido Univ.)
Keywords:
Radioactive concrete waste,Fukushi Daiichi-Nuclear Power Plant,Decommissioning,Volume reduction,Radioactive waste management
At the Fukushima Daiichi Nuclear Power Plant (1F), a large volume of radioactive waste is expected to be generated during future decommissioning activities. Radionuclide ions may migrate deep into concrete due to long-term contamination, and crack propagation can significantly alter the diffusivity of cementitious materials. This study employs Monte Carlo simulations to investigate radionuclide ion migration coupled with crack propagation. The proposed workflow includes meso-structure generation, phase segmentation, crack propagation modeling, batch simulations under various exposure scenarios, and clearance level evaluation. The results show that although cracks enhance overall ion migration, the migration front in mortar seldom follows crack paths directly. Moreover, under exposure-drying conditions, drying causes concentration redistribution within the contaminated zone without advancing the migration front.