Pa. nuclear plant has 3rd shutdown in 1 week

FILE - Clouds spew from a cooling tower at PECO's nuclear generating station in Limerick, Pa., in this Feb. 14, 1997, file photo. (AP Photo/George Widman, file)
June 4, 2011 1:27:46 PM PDT
Reactors at an eastern Pennsylvania nuclear plant have shut down unexpectedly three times in the past week, but regulatory authorities say no safety problems have been reported.

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