The Nuclear and Industrial Safety Agency has decided not to file a criminal complaint against Tokyo Electric Power Co. for allegedly running nuclear reactors it knew were cracked, government sources said Saturday.
The agency also decided not to impose an administrative punishment on Tepco for six incidents involving five reactors in Fukushima Prefecture. It said there was no clear evidence the utility had violated the law.
It was difficult for the agency to investigate the cases because the equipment in question had already been repaired or replaced, the sources said.