Annual report for research on geosphere stability for long-term isolation of radioactive waste in fiscal year 2020

Ishimaru, Tsuneari ; Ogata, Nobuhisa ; Kokubu, Yoko   ; Shimada, Koji   ; Niwa, Masakazu   ; Shimada, Akiomi; Watanabe, Takahiro   ; Sueoka, Shigeru   ; Yokoyama, Tatsunori   ; Fujita, Natsuko  ; Ogita, Yasuhiro  ; Fukuda, Shoma   ; Tsukahara, Yuzuko ; Kagami, Saya   ; Nagata, Mitsuhiro ; Ogawa, Hiroki; Goto, Akira

This annual report documents the progress of research and development (R&D) in the 6th fiscal year during the JAEA 3rd Mid- and Long-term Plan (fiscal years 2015-2021) to provide the scientific base for assessing geosphere stability for long-term isolation of the high-level radioactive waste. The planned framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques. The current status of R&D activities with previous scientific and technological progress is summarized.