This Day In History - Nuclear Accident at Three Mile Island 1979

Nuclear Accident at Three Mile Island 1979

Sunday, March 28, 2021

All Day

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Event Description

At 4 a.m. on March 28, 1979, the worst accident in the history of the U.S. nuclear power industry begins when a pressure valve in the Unit-2 reactor at Three Mile Island fails to close. Cooling water, contaminated with radiation, drained from the open valve into adjoining buildings, and the core began to dangerously overheat.

Event Location

Three Mile Island, Londonderry, PA, United States