基于Gasflow程序的非能动安全压水堆氢气行为计算和分析

Calculation and Analysis of Hydrogen Behavior for Passive Safety PWR based Gasflow Code

本文利用Gasflow程序对非能动压水堆发生假想的严重事故后,安全壳内的氢气流动、分布和积聚行为进行了计算和分析,对安全壳内各房间的氢气风险进行了评价并给出了降低氢气燃烧风险的建议。计算结果表明,在发生大破口事故中,安全壳内氢气浓度较高的区域为破损蒸汽发生器隔间,内置换料水箱隔间和上部隔间,需要设置消氢系统来降低隔间内的氢气浓度。

By using the code of Gasflow, hydrogen flow distribution and accumulation in containment during the severe accident in passive safety PWR are calculated and analyzed. The hydrogen risk is as- sessed for every chamber in the containment. Based on the calculation results of hydrogen distribution, suggestions for reducing the risk of hydrogen combustion are given in this paper. The simulation results indicate that during the LBLOCA accident, The damaged SG chamber, IRWST chamber and Upper chamber would be the higher hydrogen concentration area, where hydrogen eliminating system is necessary to set up for reduction of hydrogen concentration.