A fault running under reactor 2 at the Tsuruga plant in Fukui Prefecture is active, a Nuclear Regulation Authority panel said Wednesday, effectively killing any chance the reactor will be reactivated.

The report by the panel of five experts, including NRA Commissioner Kunihiko Shimazaki, is the first issued on its investigation into active faults at the Tsuruga plant, and deals a heavy blow to its operator, Japan Atomic Power Co.

The NRA will discuss what to do about the Tsuruga reactor at its regular meeting scheduled for next Wednesday.