池式钠冷快堆是目前世界上较先进的堆型,其主池结构如图1所示。这种堆型工作时堆芯被循环纳流所包围,具有很好的安全性.但当主回路泵因掉电或机械故障而停止运转时仍会发生失流事故。一旦失流能否在反应堆主池内迅速建立起稳定的自然对流从而带走反应堆中的衰变余热是关系到钠冷快堆安全的一个重要问题,各国学者对此进行 Pool sodium cold fast reactor is the world’s more advanced reactor type, the main pool structure shown in Figure 1. The reactor core is surrounded by recirculating nanoflowers for safe operation when the stack reactor is in operation, but when the main circuit pump is shut down due to a power failure or mechanical failure, a loss of flow can still occur. Once the loss of flow in the main pool can quickly establish a stable natural convection to remove decay heat in the reactor is an important issue related to the safety of sodium-cooled fast reactor, which scholars from all over the world