Allison M. Macfarlane, the chair of the Nuclear Regulatory Commission, talks about her tour of the troubled San Onofre Nuclear Power Station on Monday Jan. 14, 2013 in San Juan Capistrano, Calif. The plant located between Los Angeles and San Diego hasn't produced electricity in nearly a year, after a tiny radiation leak led to the discovery of excessive wear on hundreds of tubes that carry radioactive water. (AP Photo/Lenny Ignelzi)

Associated Press
Allison M. Macfarlane, the chair of the Nuclear Regulatory Commission, talks about her tour of the troubled San Onofre Nuclear Power Station on Monday Jan. 14, 2013 in San Juan Capistrano, Calif. The plant located between Los Angeles and San Diego hasn't produced electricity in nearly a year, after a tiny radiation leak led to the discovery of excessive wear on hundreds of tubes that carry radioactive water. (AP Photo/Lenny Ignelzi)
Allison M. Macfarlane, the chair of the Nuclear Regulatory Commission, talks about her tour of the troubled San Onofre Nuclear Power Station on Monday Jan. 14, 2013 in San Juan Capistrano, Calif. The plant located between Los Angeles and San Diego hasn't produced electricity in nearly a year, after a tiny radiation leak led to the discovery of excessive wear on hundreds of tubes that carry radioactive water. (AP Photo/Lenny Ignelzi)
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