The March 1979 accident at Three Mile Island brought the nuclear industry to a standstill . Airborne radiological contamination alarm sounded at 3 am Saturday . It was limited to a single building and no one was in danger , company says . In 1979 , Three Mile Island was the scene of the worst U.S. nuclear test .
Airborne radiological contamination alarm sounded at 3 am Saturday . It was limited to a single building and no one was in danger , company says . In 1979 , Three Mile Island was the scene of the worst U.S. nuclear test .