严重事故下开启双层安全壳环形空间通风过滤系统对缓解放射性向环境释放影响研究

核电站发生严重事故后,安全壳能包容从堆芯释放出的裂变产物,防止向环境的大量释放,但即使在安全壳完好的情况下,仍然会存在一定量泄漏。目前国际上的三代核电机型,大多采用双层安全壳的设计,对裂变产物具有一定的包容、滞留和过滤作用。本文基于我国自主设计的第三代核电机组,结合双层安全壳的设计特点和特定源项分析,对严重事故下双层安全壳之间的环形空间及其通风过滤系统对缓解裂变产物向环境释放的作用进行了定量分析,结果显示双层安全壳及环形空间通风过滤系统能够显著降低放射性气溶胶对环境的释放,对惰性气体也有一定的延缓排放作用。

Annulus Ventilation and Filtration System Mitigate Analysis of FPs Release

When the severe accident occurs in nuclear power plants(NPPs),the containment can keep most of the fission products(FPs)in it,even though the containment is intact,there are still some FP releases to the environment.Most of the Gen-III NPPs use double-containment design,and the annulus space between the inner containment and outer containment may contain,retain and reduce the FP releases by the filtration of annulus ventilation system.In this paper,according to the design of Gen-III NPP by CNNC,the quantity of severe accident FP releases to the environment through the double-containment is analyzed,and the mitigation of annulus ventilation and filtration system in severe accident is evaluated.