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

A failure of the cooling system that has crippled the entire plant led to water boiling in the No4 pool.

整个核电站的冷却系统故障倒置四号池水燃沸。

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

As of 14:00 local time (05:00 GMT) on Friday, the temperature of water inside the cooling pool at reactor 3 was 15.1C, well below the safety limit of 65C, Tepco said.

BBC: Fukushima nuclear plant: Cooling system power restored

And what the chairman had testified to you yesterday was that he thought that there was no more water in the pool, essentially, there was no more cooling mechanism.

WHITEHOUSE: Press Briefing