The more the fuel is exposed, the closer the reactor comes to a full meltdown.

也就是说燃料棒暴露的越多，那么越容易全部熔化。

youdao

A "full meltdown" has a more generally accepted definition than, say, a "partial meltdown."

相比“局部熔化”，“全熔化”是一个更易于接受的定义。

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However, the fuel apparently dropped to the bottom of the containment vessel, preventing it from going into a full meltdown stage.

不过，由于燃料棒看起来落到反应堆的底部，避免了完全融毁。

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In a full meltdown, such as the 1986 Chernobyl disaster in the Soviet Union, the rods melt completely and the release of energy causes an explosion that contaminates the surrounding area with radioactive material.

WSJ: Uranium Firms Take Hit After Earthquake

But if it worsens and you have a full core meltdown, that would certainly be catastrophic.

WSJ: Uranium Firms Take Hit After Earthquake

Jamie watched his colleague panic, which turned into a full-fledged meltdown.

CNN: How to avoid a major meltdown at work