Nuclear reactor core damage is a possible severe accident during nuclear reactor operation.

反应堆堆芯损坏是反应堆运行中可能出现的严重事故。

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Eg: Meltdown is a term that describes the melting of a nuclear reactor core as a result of a nuclear accident.

融毁坏是用来形容核反应堆中心过热出现融化，而产生的核事故。

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Meltdown is a term that describes the melting of a nuclear reactor core as a result of a nuclear accident.

融毁坏是用来形容核反应堆中心过热出现融化，而产生的核事故。

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The exercise, with a command centre in Poundbury, Dorchester, will test their response to the scenario of a radioactive leak from a submarine with a damaged nuclear reactor core.

BBC: Nuclear submarine accident exercise in Portland

The core of a nuclear reactor operates at about 550 degrees Fahrenheit, well below the temperature of a coal furnace and only slightly hotter than a kitchen oven.

WSJ: William Tucker: Japan Does Not Face Another Chernobyl

Each of the reactors will be a small, modular, 125MW advanced light water reactor, which at the present time includes a design for the nuclear core and steam generator to be located at the same site, with passive safety designs.

FORBES: TVA Signs Deal for Modular Nuclear Reactors