Friday, April 5, 2013

Fukushima Nuclear Cooling System Restored after Outage - chicagotribune.com

Fukushima nuclear cooling system restored after outage - chicagotribune.com

 
Aerial view shows Tokyo Electric Power Co.'s tsunami-crippled Fukushima Daiichi nuclear power plant in Fukushima Prefecture(KYODO,REUTERS / March 11, 2013)


TOKYO (Reuters) - The operator of Japan's Fukushima Daiichi nuclear power plant said on Friday it lost the ability to cool radioactive fuel rods in one of the plant's crippled reactors for about three hours earlier in the day.

It was the second failure of the system to circulate seawater to cool spent fuel rods at the plant in the past three weeks.

Tokyo Electric Power Co (Tepco) said it was alerted by an alarm that the cooling system for the No. 3 reactor had shut down at around 2:27 p.m. (0527 GMT) after a power board failed. Technicians fixed the problem by about 5:20 p.m., the utility said.

Tepco said workers appeared to have had inadvertently caused the power outage on Friday when they were trying to install a net to keep small animals from crawling into the reactor building.

A rat caused a power outage at Fukushima last month when it triggered a circuit breaker by bumping into exposed wires. In that case, the cooling system was shut down for almost a day.


The utility has faced a range of problems with controlling ground water and maintaining the massive cooling system built to keep the reactors stable.

The plant was the site of the worst nuclear disaster since Chernobyl in March 2011 when a magnitude 9.0 earthquake triggered a tsunami that destroyed back-up generators at Fukushima and disabled the plant's cooling system. Three of the reactors melted down.

Work to decommission the plant is projected to take decades to complete.

(Reporting by Kevin Krolicki; editing by Jason Neely)



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