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America's worst accident at a civilian nuclear power plant occurred on March 28, 1979. Unbeknown to anyone, half the fuel melted in one of two nuclear reactors on Three Mile Island near Harrisburg, Pa. Large quantities of radioactivity leaked from the reactor, but most of it was contained. This online exhibition, from the Smithsonian's National Museum of American History, provides information about the Three Mile Island nuclear power plant, the course of the accident there and the steps-extending over almost 15 years-through which the nature and extent of the damage were gradually revealed. National Museum of American History
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