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FILE - In this Nov. 9, 2010 file photo, Nuclear Regulatory Commission (NRC) Chairman Gregory Jaczko is interviewed by The Associated Press in Atlanta. The NRC is ordering sweeping safety changes for U.S. nuclear power plants triggered by the crisis in Japan. Orders issued Friday require U.S. nuclear plants to install or improve venting systems to limit core damage in a serious accident, and to install sophisticated equipment to monitor water levels in pools holding radioactive spent-fuel rods. (AP Photo/David Goldman, File)

Associated Press
FILE - In this Nov. 9, 2010 file photo, Nuclear Regulatory Commission (NRC) Chairman Gregory Jaczko is interviewed by The Associated Press in Atlanta. The NRC is ordering sweeping safety changes for U.S. nuclear power plants triggered by the crisis in Japan.  Orders issued Friday require U.S. nuclear plants to install or improve venting systems to limit core damage in a serious accident, and to install sophisticated equipment to monitor water levels in pools holding radioactive spent-fuel rods.  (AP Photo/David Goldman, File)
FILE - In this Nov. 9, 2010 file photo, Nuclear Regulatory Commission (NRC) Chairman Gregory Jaczko is interviewed by The Associated Press in Atlanta. The NRC is ordering sweeping safety changes for U.S. nuclear power plants triggered by the crisis in Japan. Orders issued Friday require U.S. nuclear plants to install or improve venting systems to limit core damage in a serious accident, and to install sophisticated equipment to monitor water levels in pools holding radioactive spent-fuel rods. (AP Photo/David Goldman, File)
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