Accidental overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping.
1A less serious core meltdown happened at the Three Mile Island nuclear plant in Pennsylvania in 1979.
2He served on the NRC during the 1979 partial core meltdown at the Three Mile Island nuclear power plant in Pennsylvania.
3If reactors could lose both off-site power and backup generators it could lead to a core meltdown in a short period of time.
4'This is as bad as a fission core meltdown.