FOR RELEASE SATURDAY, MARCH 11, 2017, AT 3:01 A.M. EST.- This photo taken Feb. 28, 2017, shows a safety sign on a building at Exelon Corporation Three Mile Island nuclear generating station. Unit 1 cooling towers are in back. It's been 38 years now, but the long legacy of the March 1979 partial meltdown at the Three Mile Island nuclear power plant lingers to this day. (Dan Gleiter /PennLive.com via AP)
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