Variation of redox condition in groundwater during excavation

Watanabe, Yusuke  ; Hayashida, Kazuki; Murakami, Hiroaki  ; Iwatsuki, Teruki  

In assessing the safety of geological disposal of high-level radioactive waste, groundwater chemistry is an important factor influencing the performance of engineered materials and the behavior of radionuclides. It is essential to understand the hydrochemical changing process and stable condition after the closure of the disposal facilities. In this study, a simulated experimental drift was constructed in granite at a depth of 500 m at the Mizunami Underground Research Laboratory, and the hydrochemical condition and related processes after drift closure were observed.