Kyushu Electric Power Co. submitted on Tuesday additional documents required for safety reviews of two reactors that are considered the closest to being allowed to restart among the country's 48 offline commercial reactors, a nuclear regulatory official said.
The plant operator filed for safety assessments of the No. 1 and No. 2 reactors at its Sendai power plant last July. But the Nuclear Regulation Authority asked the company to submit additional documents outlining safety measures after finding flaws.
All of Japan's commercial reactors are offline due to safety concerns stemming from the 2011 Fukushima nuclear crisis. They need to satisfy a set of new regulations introduced following the disaster to be allowed to go back online.
The NRA has given priority to the reactors at the Sendai plant, as they have cleared major hurdles regarding the assessment of earthquakes and tsunami hazards that could affect the plant.