Evaluation methodology for influence of splay fault growth on geological disposal system, 1; Analysis of groundwater flow with consideration of fault growth

Takai, Shizuka ; Takeda, Seiji ; Sakai, Ryutaro*; Shimada, Taro ; Munakata, Masahiro ; Tanaka, Tadao 

In geological disposal, direct effect caused by geological and climatic disruptive events like active faults is avoided at the stage of site characterization; however, for some events, uncertainty about avoidance in advance still remains. In this research, we researched about growth of splay fault lying concealed, which is one of such events, and developed an integrated assessment methodology from occurrence of the event to radionuclides migration based on previous studies. Furthermore, we assumed a disposal site composed of sedimentary rocks and carried out groundwater analyses with parameters of a location of repository and growth velocity of splay fault. We indicated the result of effect on migration paths and salt concentration by splay fault growth.