The reactor core which includes these rods, and the water it sits in, are contained within a thick steel pressure vessel.
这些燃料棒就是反应堆的核心，它位于水中，并包裹在厚厚的钢制压力容器中。
Water in the core began to boil off, raising the temperature and pressure inside the massive steel containment vessel.
堆芯的水开始沸腾，导致钢结构的安全壳内部的温度和压力开始升高。
This prolongs the reactors core life by preventing the embrittlement of the steel of the pressure vessel, with some reactors being designed to last between 40 and 50 years.
通过防止压力窗口钢质的脆化，从而延长了核反应堆芯的寿命，有些反应器寿命更是长达40-50年。
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