FILE - In this undated file photo, a Pennsylvania state police officer and plant security guards stand outside the closed front gate to the Metropolitan Edison nuclear power plant on Three Mile Island near Harrisburg, Pa., after the plant was shut down following a partial meltdown on March 28, 1979. Exelon Corp., the owner of Three Mile Island, said Monday, May 29, 2017 it will shut down the plant in 2019 without a financial rescue from Pennsylvania. (AP Photo/Paul Vathis, File)
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