A nuclear reactor in Miyagi Prefecture damaged by the 2011 earthquake and tsunami disaster formally cleared screening by a national nuclear watchdog on Wednesday, paving the way for it to restart after anti-disaster measures are completed by the end of March next year.

The No. 2 unit of Tohoku Electric Power Co.'s Onagawa plant won the approval of the Nuclear Regulation Authority, becoming the second disaster-damaged reactor, after the Tokai No. 2 power plant in Ibaraki Prefecture, to pass stricter safety standards introduced after the Fukushima nuclear crisis.

Construction of an 800-meter seawall is among anti-disaster measures that still need to be completed at the plant, which straddles the town of Onagawa and the city of Ishinomaki. The operator also needs to obtain consent from local residents before it can restart the plant.