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Generally, deeper 300m depth part of subsurface is expected as the high-level radioactive waste (HLW) disposal site due to low mobility of chemical species and reductive condition. It can be assumed that deep subsurface environment becomes oxidative condition by excavation for geological disposal of HLW. It is important that oxidative condition returns to the previous reductive condition after backfilling the pit. In this study, to evaluate whether once oxidized core sample changes to reductive condition again, the column experiments for rock-water interaction were carried out. In the experiments, granodiorite and crystalline schist were used, and they were filled with seawater or distilled water as pore water, respectively. From the results of the experiments using seawater and distilled water, both ORP values were shown to decrease.

REDOX PROCESSES BY ROCK-WATER INTERACTION IN SUBSURFACE ENVIRONMENT