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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.
It is well known that the 1979 Three Mile Island accident cost utilities millions of dollars for safety upgrades at plants around the country. It is less well known that security problems at TMI have also triggered millions of dollars in security upgrades at American nuclear facilities.