Pumps cooling Fukushima reactors hit by power failure, backup kicks in

Workers wearing protective suits and masks constructing water tanks are seen through a bus window at Tokyo Electric Power Co on Feb 20, 2012 file photograph. The operator of Japan's crippled Fukushima nuclear plant said on Monday that pumps used to i
Workers wearing protective suits and masks constructing water tanks are seen through a bus window at Tokyo Electric Power Co on Feb 20, 2012 file photograph. The operator of Japan's crippled Fukushima nuclear plant said on Monday that pumps used to inject water to cool damaged reactors were hit by power failure, but that a backup system kicked in immediately. -- FILE PHOTO: REUTERS  

TOKYO (REUTERS) - The operator of Japan's crippled Fukushima nuclear plant said on Monday that pumps used to inject water to cool damaged reactors were hit by power failure, but that a backup system kicked in immediately.

Tokyo Electric Power Co, or Tepco, pours hundreds of tonnes of water a day over the reactors to cool them after a devastating earthquake and tsunami in March 2011 caused nuclear fuel to melt down. Tepco stores the radioactive runoff in tanks above ground.