nuclear meltdown

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Noun1.nuclear meltdown - severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escapingnuclear meltdown - severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping
overheating - excessive heating
References in periodicals archive ?
In summary on Fukushima, a 40 year old nuclear plant essentially survived Japan's worst recorded earthquake, and although three core meltdowns are likely to have occurred, there has been no exposure of their fuel outside the pressure and containment vessels.
the 1979 Three Mile Island core meltdown incident), and the corresponding public risk; (2) various factors in the U.
Pro-nuke critics blasted the movie for its bias, then shut their mouths tight when Three Mile Island suffered its core meltdown 11 days later--one of history's most disturbing examples of life imitating art.
But local media reported that the plant would have been at risk of a reactor core meltdown had the crisis continued for more than eight hours.
Some experts believe that corroded rods could exacerbate other system failures and contribute to a core meltdown, resulting in substantial fatalities and the contamination of food, air, and water.
The accumulation of hydrogen gas in large volumes takes place during core meltdown accidents inside the containment of light and heavy water nuclear power reactors.
The reactor can close down safely in the event of an emergency without causing a reactor core meltdown or large leak of radioactive material, in line with the fourth-generation concept.
USA (1979): Partial core meltdown at Three Mile Island.
After the Three Mile Island partial core meltdown in 1979, NRC commissioners suspended all licensing decisions until they had investigated the regulatory implications of the accident.
These include additional systems to prevent core meltdown and innovation to mitigate its potential consequences as well as technological advances to ensure resistance to external hazards, in particular earthquakes.
The 1979 nuclear accident at Three Mile Island involved a partial core meltdown of a pressurized water reactor.