File photo of U.S. NRC Chairman Jaczko listening to testimony about Japan's nuclear problems at the NRC's headquarters in Rockville

 
File photo of U.S. NRC Chairman Jaczko listening to testimony about Japan
U.S. Nuclear Regulatory Commission (NRC) Chairman Gregory Jaczko listens to testimony about Japan's nuclear problems at the NRC's headquarters in Rockville, Maryland in this March 21, 2011 file photo. Jaczko said on May 21, 2012 that he would resign, following a year of intense criticism over his abrasive management style. REUTERS/Larry Downing/Files (UNITED STATES - Tags: POLITICS ENERGY)