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

International Conference on Manufacturing Technology, Materials and Chemical Engineering

材料科学;化学工业

Ling, H.^1^2 ; Chen, L.^1 ; Chen, W.M.^1 ; Yun, L.^1

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

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

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/592/1/012049/pdf
DOI  :  10.1088/1757-899X/592/1/012049

学科分类：材料科学（综合）

来源: IOP

【 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.