The Nuclear Regulation Authority said the Tsuruga No. 2 reactor is “unfit” as its operator failed to address safety risks stemming from the presence of possible active fault lines, which can potentially cause earthquakes, underneath it.

Tsuruga No. 2, operated by the Japan Atomic Power Co., is the first reactor to be rejected under safety standards adopted in 2013 based on lessons from the 2011 Fukushima Daiichi meltdown disaster following a massive earthquake and tsunami.