A deep geological repository for disposal of high-level radioactive waste (HLW) consists of the canister, buffer material, and natural rock. If radionuclides leak from a disposal container, it can pass through buffer materials and rock, and move into the biosphere. Transport and migration of radionuclides in the rock differently were affected by the fracture type, filling minerals in the fracture, and the chemical and hydraulic properties of the groundwater. In this study, aperture distribution in fractured granite block was investigated by hydraulic test and CFD analysis. The fractured rock block (1 m × 0.6 m × 0.6 m), which is simulated as natural barrier, was prepared from Iksan, Jeollabuk-do. 9 test holes were drilled and packer system was installed to perform hydraulic test at the surface of fracture. 3D model simulated for aperture distribution of rock block was made using results of hydraulic test. And then, CFD analysis was performed to evaluate the co-relation between experiment results and analysis results using FLUENT code.

• Ki-Jong Jang(Korea Atomic Energy Research Institute (KAERI)) Corresponding author
• Sang-Hee Park(Kumoh National Institute of Technology)
• Bong-Ju Kim(Korea Atomic Energy Research Institute (KAERI))
• Ja-Young Goo(Korea Atomic Energy Research Institute (KAERI))
• Youg-Kwon Koh(Korea Atomic Energy Research Institute (KAERI))
• Jang-Soon Kwon(Korea Atomic Energy Research Institute (KAERI))