Thermal dimension analysis of the HLW horizontal disposal

The temperature on the canister surface is set to be not more than l00℃ in the high-level radioactive waste (HLW) repository, it is a criterion which dictates the dimension of the repository. The thermal conductivity property and the temperature evolution around the single canister are studied by using the analysis method and the numerical method, on the basis of it, the thermal evolution of the single horizontal disposal panel was analyzed, and the optimized tunnel space design for horizontal disposal of the canister was studied also. The findings are as follows: the most important and the most sensitive parameter is the initial disposal power of the canister. The highest temperature on the canister surface will be 4 ∼ 5℃ higher when the whole canister is disposed of at the same time in comparison with the canister disposal rate being 20 every year. Considering a ten degree temperature offset when the highest temperature on the canister surface is set to 90℃, the optimized design for horizontal disposal of the canister is as follows: the disposal tunnel distance is 9.8 m and the deposition hole distance is 9.8 m. (authors)