Mizunami Underground Research Laboratory Project, Annual report for fiscal year 2019

Takeuchi, Ryuji  ; Onoe, Hironori ; Murakami, Hiroaki  ; Watanabe, Yusuke  ; Mikake, Shinichiro ; Ikeda, Koki; Iyatomi, Yosuke ; Nishio, Kazuhisa*; Sasao, Eiji   

The Mizunami Underground Research Laboratory (MIU) Project is being pursued by the Japan Atomic Energy Agency (JAEA) to enhance the reliability of geological disposal technologies through investigations of the deep geological environment in the crystalline rock (granite) at Mizunami City, Gifu Prefecture, central Japan. On the occasion of JAEA reformation in FY2014, JAEA identified three remaining important issues on the geoscientific research program based on the synthesized latest results of research and development (R&D): "Development of countermeasure technologies for reducing groundwater inflow", "Development of modeling technologies for mass transport" and "Development of drift backfilling technologies". At the MIU, the R&D are being pursued with a focus on the remaining important issues from FY2015, and satisfactory results have been achieved. Based on this situation, the R&D on the MIU Project were completed at the end of FY2019. In this report, the results of R&D and construction activities of the MIU Project in FY2019 are summarized.