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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.
One of the purposes of the Treaty on the Non-Proliferation of Nuclear Weapons was to promote the use of nuclear power stations. (This was in 1968 before Chernobyl, Three Mile Island or Fukushima accidents, and governments believed them to be safe).