Smoke emerged at a service building of the Kashiwazaki-Kariwa nuclear power plant in Niigata Prefecture on Thursday but it quickly halted after a firefighting effort by workers, its operator said.
Tokyo Electric Power Company Holdings Inc. said there was no radiation leak in the incident. The utility has not identified the cause of the incident.
[…]
The building is not a radiation controlled area, according to the company.
Read more at Smoke emerges at TEPCO’s Niigata nuclear plant