FILE - In this March 16, 2011 photo, steam escapes from Exelon Corp.'s nuclear plant in Byron, Ill. A nuclear reactor the plant shut down Monday, Jan. 30, 2012 after losing power, and

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FILE - In this March 16, 2011 photo, steam escapes from Exelon Corp.'s nuclear plant in Byron, Ill. A nuclear reactor the plant shut down Monday, Jan. 30, 2012 after losing power, and steam was being vented to reduce pressure, according to officials from Exelon Nuclear and federal regulators. (AP Photo/Robert Ray, File) less 

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Associated Press
Tue, Jan 31, 2012 7:06 PM EST