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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.
Both of them. Here's the pat answer:   Mechanical failure and operator errors in the wake of an initial mechanical failure caused the problems at Three Mile Island that resulted in the reactor core meltdown.   There were a number of chances for the accident to be cut off before it got as bad as it did.