The accident that results when the temperature in the core of a nuclear reactor increases enough to melt the fuel and breach the containment vessel is called a nuclear

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A nuclear meltdown is the accident that occurs when the temperature in the core of a nuclear reactor increases to the point where the fuel rods begin to melt and release radioactive material. This can happen if the reactor is not properly cooled. It can lead to a breach of the containment vessel and the release of radiation into the environment. While there can be fires and explosions associated with a nuclear meltdown, these are not the defining features of the accident.

The Accident That Results When the Temperature in the Core