Power has been restored to part of the cooling system at Japan’s tsunami-hit Fukushima nuclear plant, after it failed for the second time in a month.
The breakdown was not thought to pose any immediate danger, operator Tokyo Electric Power (Tepco) said.
An alarm at reactor number three earlier revealed the system had stopped at one of the pools containing spent, but highly radioactive, fuel rods.
Last month a power cut shut cooling systems for four spent fuel ponds.
The ponds cool the fuel - which generates intense heat - and provide shielding from radiation. The spent fuel remains in the ponds for a year or more.
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