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The Three Mile Island accident was a partial nuclear meltdown that occurred on March 28, 1979, in one of the two Three Mile Island nuclear reactors in Dauphin County, Pennsylvania, United States. It was the worst accident in U.S. commercial nuclear power plant history.
Today marks the 35th anniversary of the worst nuclear accident in U.S. history. On March 28th, 1979 one of the reactors at the The Three Mile Island nuclear power plant in Dauphin County partially melted down. Back then, no one knew exactly what was going to happen. The incident was unprecedented.