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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.
1 Three Mile Island: meaning and definitions-Three Mile Island: Definition and Pronunciation. 2  Nuclear and Chemical Accidents-Nuclear and Chemical Accidents Though nuclear power is a good source of energy and is generally not ...n Mar. 28, 1979, failure of the cooling system of the No. 2 nuclear reactor led to overheating and partial melting of its uranium core and production of hydrogen gas, which raised fears of an explosion and dispersal of radioactivity.