Fracture Zone at the Prototype Fast Breeder Reactor Monju is active

―Issues on the External Expert Meeting of On-site Fracture Zone at the Prototype Fast Breeder Reactor Monju―

Abstract

　 The evaluation of active faults on the site of nuclear facilities is an important issue that should not be overlooked because it affects the lives and safety of the public. The Nuclear Regulation Authority’s External Expert Meeting on the Fracture Zone on the Site of the Prototype Fast Breeder Reactor Monju concluded in its evaluation report that the on-site ‘a’ fracture zone is not an active fault which has not been active since at least the Late Pleistocene. From the tectonic geomorphological point of view, it is highly likely that the fracture zone is an active fault continuing to the known Shiraki-Nyu fault. The report does not appropriately reflect the opinions of the experts and reviewers, and contains many fatal issues.