Definition of nuclear meltdown Nuclear meltdown
We found 3 definitions of nuclear meltdown from 3 different sources.
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What does nuclear meltdown mean?
WordNet
Noun |
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| nuclear meltdown - severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping | ||
| meltdown | ||
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OmegaWiki DictionaryOmegaWiki Dictionary Ω
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nuclear meltdown
Accidental overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping.
Wikipedia 
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A nuclear meltdown describes a special type of situation, which may happen at a nuclear reactor. Sometimes, the middle portion of the nuclear reactor (that is, its core) does not get cooled properly. Due to some defects, the cooling system fails or its functioning becomes defective. If this happens, then uranium or plutonium or similar materials inside the nuclear reactor become hot. When they become very hot, such materials start melting or dissolving. If such a position arises in a nuclear reactor, it is a nuclear meltdown.
Meltdowns.
Around the world, some nuclear meltdowns have occurred. Some of them were mild, but few of them were very serious.
In 1986, a nuclear meltdown occurred in a place named Chernobyl (Ukraine). In this case, all the people living in the towns and the villages (near the defective nuclear reactor) had to move to far away places.
Many Russian submarines get power from nuclear energy produced inside these submarines. These are nuclear submarines. Some such nuclear submarines have faced nuclear meltdown.
Sometimes, the nuclear meltdown may happen immediately. For example, the nuclear reactor at Chernobyl. Sometimes, the nuclear meltdown may take many hours to happen. For example, the nuclear meltdown at Three Mile Island, (Pennsylvania, United States) took many hours to happen.
A nuclear meltdown may happen on account of one or more reasons.
