On Mar. 28, 1979, the most significant nuclear power accident in U.S. history began after a pressure valve failed to close at ...

Three Mile Island’s Unit 2 reactor had partially melted down that morning, releasing dangerous radioactive gases into the atmosphere and triggering a panic that would grip the nation for days ...

DAUPHIN COUNTY, Pa. — On March 28 ,1979, the Unit 2 reactor on Three Mile Island went through a partial meltdown, marking the worst nuclear power accident in U.S. history. With Constellation ...