The reactor vessel is surrounded by a thick steel-and-concrete primary containment vessel, equipped with a water reservoir designed to suppress overheating of the vessel.
反应堆由一个钢与混凝土构成的厚实外壳(第一层安全壳)保护着，另外还配有一个蓄水库，防止反应堆过热。
2
Overheating of components can change the original steel temper and mechanical properties of the affected area.
部件过热会改变受影响区域内钢材的初始韧度和机械性能。
3
To enjoy the benefits of concrete - preventing rapid warming and overheating of the interior - the grooves in the steel sheets are partly filled with concrete.