The fire was extinguished by a worker at the Kashiwazaki-Kariwa plant, according to Shogo Fukuda, a spokesman for Tokyo Electric Power Co., which operates the facility. The plant is the world's largest in terms of power output capacity.
The blaze started from a power cable of an air conditioner on the roof of a building at the plant, Fukuda said. It occurred outside the restricted area, and there was no danger of a radiation leak, he said. Firefighters later confirmed that the fire was extinguished in about half an hour.
Nobody was injured in the fire, but the extent of damage to the plant was not immediately known, the spokesman said. The cause of the fire was under investigation, he said.
The plant suffered a long list of radioactive leaks and malfunctions during the magnitude 6.8 quake on July 16, which killed 11 people and injured more than 1,000. It was undergoing repairs and a series of tests following the quake damage.
The plant is located about 125 miles northwest of Tokyo.
