Annual report for research on geosphere stability for long-term isolation of radioactive waste in fiscal year 2023

Niwa, Masakazu   ; Shimada, Koji   ; Sueoka, Shigeru   ; Ishihara, Takanori; Hakoiwa, Hiroaki; Asamori, Koichi; Murakami, Osamu  ; Fukuda, Shoma   ; Ogita, Yasuhiro  ; Kagami, Saya   ; Yokoyama, Tatsunori   ; Ogata, Manabu ; Nakajima, Toru   ; Fujita, Natsuko   ; Jinno, Satoshi   ; Watanabe, Takahiro   

This annual report documents the progress of research and development (R&D) in the 2nd fiscal year of the JAEA 4th Medium- and Long-term Plan (fiscal years 2022-2028) to provide the scientific base for assessing geosphere stability for long-term isolation of high-level radioactive waste. The plan 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.