This causes a drop in pressure that makes the star unstable and causes it to contract under its own weight. Eventually the process ignites runaway nuclear reactions that rip the star apart.

这引会起压强的突降，使得恒星不稳定并在自己的重力下收缩。最终这个过程引发了雪崩式的核反应并将恒星斯裂开。

youdao

As you show, nuclear can only survive if the public subsidizes and holds the industry harmless from the cataclysmic disasters that runaway reactors can unleash.

正如作者所说的，只有在公众资助以及当行将崩溃的反应堆引发的大灾难并没有对工业造成损失的情况下，核能发电才能存在下去。

youdao

Indeed, despite increasingly clear signs of Iran's runaway nuclear ambitions, the Kremlin remains opposed to the very idea of comprehensive sanctions against the Islamic Republic.

FORBES

You can't have a "runaway reactor, " nor can a reactor explode like a nuclear bomb.

WSJ: William Tucker: Japan Does Not Face Another Chernobyl