File photo of NRC Chairman Jaczko attending a press briefing at the United Nations headquarters in Vienna

 
File photo of NRC Chairman Jaczko attending a press briefing at the United Nations headquarters in Vienna
U.S. Nuclear Regulatory Commission Chairman Gregory Jaczko attends a press briefing at the United Nations headquarters in Vienna in this April 4, 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/Herwig Prammer/Files (AUSTRIA - Tags: POLITICS HEADSHOT ENERGY)