Barrier of near-surface LILW disposal facility in Korea. Hydraulic model development

The primary objective of the engineered barrier of Low-and Intermediate Level radioactive Waste (LILW) disposal facility is to limit the amount of water ingress that passes through the engineered barrier and to protect waste packages. From the mid of 2015, the silo type disposal facility for LILW started for its operation as the first stage. As the second stage, the vault type of near-surface disposal facility is being prepared in Korea. The second stage facility is composed of the multiple engineered barrier cover system so that the effects by rainfall are reduced and thus leakage of radioactive substances can be minimized. The cover system is composed of several different layers including surface, protective, drainage and barrier layer. In this paper, Hydro-geological concept modeling to predict the rainfall infiltration through the cover system is performed by using Finite Element subsurface Flow code (FEFLOW). (author)