This file photo taken on March 6, 2013 shows workers wearing protective suits and masks next to the spent fuel pool inside the Common Pool Building.

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The outage is one of several recently

Other outages were blamed on rats

The 2011 tsunami that hit Fukushima Daiichi plant causing a nuclear meltdown

CNN  — 

The cooling system for a nuclear reactor at Japan’s Fukushima Daiichi plant lost power for hours Friday afternoon but was operational again, officials at the Tokyo Electric Power Company said.

The outage is one of several that has hampered the facility recently. There have been many repairs at the plant since the devastating earthquake and tsunami in March 2011 that triggered a nuclear disaster there.

Fukushima’s nuclear ghost town

Last month, power outages at the critical nuclear facility were blamed on rats short circuiting a switchboard, Japan’s Kyodo news agency reported. Officials said at that time that the temporary power loss did not trigger a known release of radioactive material.

Read: More U.S. military join lawsuit over Fukushima exposure

Metal panels were to be installed Friday around the cooling system to ward off small animals, a Tokyo Electric Power Company spokesman said.

The tsunami that hit Fukushima Daiichi after Japan’s historic earthquake knocked out power and coolant systems at the plant, resulting in meltdowns in three reactors. The result was the worst nuclear accident since Chernobyl, as the crippled reactors spewed enormous amounts of radioactive particles into the environment.

The Tokyo Electric Power Company, the operator of the Fukushima plant, has said it is monitoring radiation contamination levels around the plant.

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