The reactor building is an outer shell that is supposed to keep the weather out, but nothing in.

反应器建筑是整个核能源厂的外壳性建筑，以便保持厂内恒温，不受外界气候变化影响。

youdao

The corrosion and temper embrittlement of reactor shell probably occurred under hot wall condition were analyzed.

对反应器壳体在热壁条件下可能发生的腐蚀和回火脆性进行了分析。

youdao

The strength and equivalent stress of the remainder wall thickness of reactor shell under new working condition were checked.

对反应器壳体剩余壁厚在新工况条件下的强度和当量应力进行了校核；

youdao

In like manner, I believe that reactors should be designed such that an earthquake of any magnitude could not destroy the reactor or its containment shell, further that if the reactor core was to start to melt down, the melt down itself would shut the reactor down and, at the very worst, the reactor would entomb itself with no potential release of radiation into the environment.

FORBES: A Year After Fukushima Meltdown, Is Nuke Power Any Safer?