Research plan on geosphere stability for long-term isolation of radioactive waste (Scientific program for fiscal year 2021)

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

This report is a plan of research and development (R&D) on geosphere stability for long-term isolation of high-level radioactive waste (HLW) in Japan Atomic Energy Agency (JAEA), in fiscal year 2021. The objectives and contents in fiscal year 2021 are described in detail based on the JAEA 3rd Medium- and Long-term Plan (fiscal years 2015-2021). In addition, the background of this research is described from the necessity and the significance for site investigation and safety assessment, and the past progress. 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.