Photo by: Mary Ann Chastain

** FILE ** Steam rises from the cooling towers of nuclear reactors at Georgia Power's Vogtle plant in Waynesboro, Ga., in April 2010. The Nuclear Regulatory Commission on Thursday, Feb. 9, 2012, approved the construction of two new nuclear units at the Vogtle site — the first new reactors in the United States in 30 years. (AP Photo/Mary Ann Chastain, File)