The study of migration velocity of Cs-135 and Se-79 in intact rock

[摘要] The migration characteristics of highly mobile nuclides in natural barrier are the key concerns in the long-term safety assessment of geological disposal facilities. This paper focused on typical granite in Beishan area for geological disposal of high-level radioactive waste, and established a computational model for the release and migrate of nuclides after closure of repository by GoldSim. The migration characteristics of Cs-135 and Se-79 were analyzed by Monte Carlo stochastic simulation. The results show that the migration characteristics of Cs-135 and Se-79 in intact rock are direct influenced by hydraulic conductivity and hydraulic gradient, the migration velocity are 2.47×10-4m/a and 9.61×10-4m/a when the hydraulic conductivity correspond to 5.74 ×10-9 m/s. The analysis of the results shows that the migration characteristics can provide feedback guidance for the site selection and design of the disposal repository.

[发布机构] Beijing Research Institute of Uranium Geology, CNNC, Beijing; 100029, China^1;Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang; 421001, China^2

[效力级别] 化学工业 [学科分类] 材料科学（综合）

[关键词] Computational model;Geological disposals;High level radioactive wastes;Hydraulic gradients;Intact rocks;Long-term safety;Migration velocity;Monte Carlo stochastic simulation