To protect the core, and prevent a bigger problem, authorities had to vent some of that steam into the atmosphere, which means venting some of the radioactive particles along with them.

为了保护核心，阻止更大的问题，专家们必须放出一些水蒸气至大气中，这就意味着随之放出一些有辐射性的微粒。

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This paper introduces the methods of the air venting of sealed cores and the place merit of core supports. This process puts forward a new concept in casting production.

本文介绍了这种铸件在生产过程中，不出砂坭芯的排气和摆放芯撑的方法。

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New rules imposed by the NRC require plant operators to install or improve venting systems to limit core damage in a serious accident and set up sophisticated equipment to monitor water levels in pools of spent nuclear fuel.

NPR: Nuclear Chief: US Plants Safer After Japan Crisis