On Tuesday, Tokyo Electric Power Company (Tepco) said steam was seen around the fifth floor of the building housing Reactor No 3 shortly after 09:00 local time (00:00 GMT).
Workers were continuing with the ongoing operation to inject cooling water into the reactor and a pool storing nuclear fuel, it added.
It is not clear what is causing the steam, but levels of radiation around the reactor have not changed.
The sight of steam rising is worrying because it means somewhere inside the reactor building water is boiling, says the BBC’s Rupert Wingfield-Hayes in Tokyo.
The badly damaged reactors are supposed to be in what is called “cold shutdown”; the temperature of the cooling water inside the reactor should be well below boiling point.
It is another sign that Tepco still does not fully know what is going on inside the damaged reactors, our correspondent adds.
Steam was last seen rising from a reactor building at the plant on 18 July.
The plant was crippled by an earthquake and tsunami in 2011, which knocked out cooling systems to the reactors, three of which melted down.
Continue reading at Fukushima nuclear plant: Japan takes steps over sea leak
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