Commercial operations have resumed at Kashiwazaki Kariwa nuclear power plant in Japan’s Niigata Prefecture, Tokyo Electric Power Company has announced.

Last week’s commercial restart of Unit 6, a 1,315-MWe boiling water reactor, is the first for a TEPCO nuclear facility since the March 11, 2011, earthquake and tsunami triggered an accident at the utility’s Fukushima Daiichi nuclear plant.

Update: Operation of Unit 6 at Kashiwazaki Kariwa nuclear power plant in Japan’s Niigata Prefecture was suspended Thursday morning after its initial restart on the evening of Wednesday, January 21. According to TEPCO spokesperson Takashi Kobayashi, an alarm sounded “during reactor start-up procedures.” The cause is currently under investigation, but there is no danger inside or outside the plant. Plant chief Takeyuki Inagaki said at a news conference, “The equipment is essential to safe operation, and we will examine it inside-out.”