"We have received information from TEPCO that the fire and smoke is now invisible and it appears to have gone out of its own accord," Minoru Ogoda, a spokesman for the state nuclear safety agency, told AFP.
The plant is operated by the Tokyo Electric Power Co (TEPCO).
The blaze had broken out on the fourth floor of the number-four reactor at the Fukushima No. I plant, 250 kilometres (155 miles) northeast of Tokyo.
A fire and explosion hit the same reactor on Tuesday, causing a crack in the roof.(*)
Editor: Aditia Maruli Radja
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