A second explosion happened when hydrogen was formed by hot water steam contacting zirconium.

当热的水蒸汽接触锆形成氢气时，二次爆炸。

In theory says Valentijn this can create a high enough temperature to generate superheated steam.

Valentijn说，理论上程可以产足够高的温度来产热蒸汽。

Vents allow any steam to escape if the system overheats.

【escape】系统热时，蒸汽可从排放口逸出。