Development of geological models in the Mizunami Underground Research Laboratory Project; Updating results of "Shaft460 geological model" and "shaft500 geological model" in Phase 2

Ishibashi, Masayuki; Sasao, Eiji   ; Kuboshima, Koji; Matsuoka, Toshiyuki

Japan Atomic Energy Agency at Tono Geoscience Center is developing a geoscientific research project named the Mizunami Underground Research Laboratory (MIU) project in crystalline rock environment in order to establish scientific and technological basis for geological disposal of HLW. Geoscientific research at MIU is planned to be carried out in three phases; Surface-based Investigation Phase (Phase 1), Construction Phase (Phase 2) and Operation Phase (Phase 3). Currently, the project is under the Construction Phase (Phase 2) and the Operation Phase (Phase 3). In the phase 2, the geological models have been updated six times (Shaft180, Pilot500, Substage200, Stage300, Shaft460 and Shaft500 geological model) based on the increasing data. The updating result from Shaft180 geological model to Stage300 geological model was already published. Thus this document mainly describes Shaft460 and Shaft500 geological models at the Phase 2.