Regulators are in the process of deciding which reactors are sitting on active faults, but the experts involved say there is clearly room for improvement.
Fault exams at three nuclear power plants are proceeding in parallel. The first one to be finalized by an expert panel was accepted by the Nuclear Regulation Authority on Wednesday.
NRA Chairman Shunichi Tanaka fully backed the assessment, which said that a fault beneath reactor 2 of the Tsuruga plant in Fukui Prefecture is active.