This Dec. 14, 2010 file photo shows Exelon Generation's Braidwood nuclear power plant in Braceville, Ill.
This Dec. 14, 2010 file photo shows Exelon Generation's Braidwood nuclear power plant in Braceville, Ill. Charles Rex Arbogast AP
This Dec. 14, 2010 file photo shows Exelon Generation's Braidwood nuclear power plant in Braceville, Ill. Charles Rex Arbogast AP