Extracting heat from very hot, dry rocks presents a more difficult problem: the rocks must be fractured to permit the circulation of water, and the water must be provided artificially.
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。
3
Paojiao winter with hotwater, to promote local blood circulation to prevent the occurrence of frostbite.