The pool cooling water must be continuously circulated. Without circulation, the still thermally hot irradiated nuclear fuel in the storage pools will begin to boil off the cooling water.

池中的冷水必须连续循环，如果不循环的话，贮存池中非常热地热放射性核燃料就会将冷水烧沸。

youdao

In addition to the reactor cores, the storage pool for highly radioactive irradiated nuclear fuel is also at risk. The pool cooling water must be continuously circulated.

除了反应堆堆芯，用来储存辐射性极强的辐照核燃料的贮存池也很危险。

youdao

The result shows that if the cooling system of the spent fuel storage pool can be retrieved in 19 hours, the natural circulation cooling ability is sufficient to prevent radioactivity release.

计算结果表明。恰希玛核电厂乏燃料池冷却系统失效后， 只要在19 个小时内修复冷却系统， 不会出现大量放射性物质外泄。

youdao

Restarting cooling to the spent fuel pool at reactor 4 had been of particular urgency for Tepco as it had the highest number of fuel assemblies stored there, Kyodo news agency reported.

BBC: Power at Fukushima nuclear fuel ponds restored

This is a very difficult situation, and there will be a lot of work continuing as we go forward to deal with continuing to cool the reactors and to provide cooling to the spent fuel pool.

WHITEHOUSE: Press Briefing

The IAEA statement was released hours after Tepco temporarily shut down the cooling system in the second unit's spent fuel pool following the discovery of dead rodents near a transformer.

BBC: IAEA calls for improvements at Japan's Fukushima plant