锆锡合金由于中子辐照而引起生长。
核材料自身还完好无缺，但是它们周围的锆锡合金已经熔化。
The nuclear material itself was still intact, but the surrounding Zircaloy shell had started failing.
锆锡合金形成第二道防护，把放射燃料跟反应堆其他的组成分隔开。
The Zircaloy casing is the second barrier to release that separates the radioactive fuel from the rest of the reactor.
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