模块式高温气冷堆进水事故后的氢气行为分析

Hydrogen Behavior after Water-ingress Accident of HTR-PM

蒸汽发生器两根传热管双端断裂是模块式高温气冷堆(HTR-PM)典型的超设计基准事故,事故可能会导致氢气在反应堆舱室内的聚集,产生爆燃甚至爆轰的风险。本文使用反应堆流体计算程序GASFLOW,模拟了两根传热管断裂后排放到蒸汽发生器舱室以及反应堆舱室内的气体的输运及分布,并利用氢气燃爆分析程序COM3D进行了舱室内的氢气燃烧分析。计算结果表明,两根传热管断裂事故排放的氢气含量很小,舱室内氢气浓度最大不超过0.1%,如此低浓度的氢气不会发生燃烧爆炸。

The water-ingress accident resulted from a double-ended guillotine break of two steam generator heating tubes is a typical beyond design basis accident of HTR-PM which may cause the aggregation of hydrogen in the cavity,and consequently result in the threat of deflagration or even detonation.The paper simulated the behavior of gas entering the cavity after the double-ended guillotine break of two heating tubes,using the GASFLOW program.Besides,COM3 Dprogram was used to analyze the combustion of hydrogen in the cavity.According to the simulation results,the concentration of hydrogen in the containment is quite small,and the maximum value is below 0.1%,which means that there will exist no risk of hydrogen explosion in the HTR-PM when the water-ingress accident happens.