Kyodo, Feb 23, 2017: Smoke emerges at TEPCO’s Niigata nuclear plant — 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 plant operator confirmed smoke coming out around 3:25 p.m. from a locker room inside the service building, located near the No. 6 and No. 7 reactors at the plant…

Xinhua, Feb 23, 2017: TEPCO unaware of cause of smoke at Niigata nuclear plant in latest blunder  – Tokyo Electric Power Company Holdings Inc. (TEPCO) on Thursday said that it had detected smoke billowing from a service room near two reactors at its Kashiwazaki-Kariwa nuclear power plant in Niigata Prefecture, located on the west coast of Honshu island. TEPCO said that there was no radiation leak as a result of the possible fire which occurred close to its Sea of Japan-facing reactors, although the utility has yet to comment on the cause of the fire. The plant operator said that it noticed smoke billowing out of a locker room inside the service building near its No. 6 and No. 7 reactors at the facility…

See also: Tepco finds bent, damaged spent fuel assemblies in multiple fuel pools at Japan nuclear plant — Concern about prompt moderated criticality