M310核电厂严重事故下稳压器隔间氢气风险分析

基于GASFLOW程序,选取对M310核电厂稳压器隔间内氢气风险极为不利的两种事故工况,对安全壳内氢气风险进行了分析计算。模拟结果显示:在所研究的工况条件下,卸压箱隔间、波动管隔间、稳压器隔间及穹顶区域内,只有波动管双端断裂事故在早期氢气集中释放阶段,出现了稳压器隔间内FA准则数大于1的情况,其他隔间及其他工况下所有隔间内的FA准则数和DDT准则数均不会超过1。即,所研究隔间内均可以排除燃爆转变风险。破口隔间内部氢气浓度分布主要受源项氢气浓度以及混合气体夹带作用的影响,不同位置的氢气浓度变化存在显著差别。安全壳大空间的氢气浓度呈层状结构,随着时间推移,层状结构向下推移,安全壳大空间氢气浓度分布呈均匀化趋势发展。

Pressurizer Room Hydrogen Risk Analysis of M310 Nuclear Power Plant Under Severe Accidents

Containment hydrogen risk of M310 is presented by the method of GASFLOW.In the analysis of hydrogen risk two severe accidents conditions which are extremely harmful to the pressurizer room are choosed.The results show that only at the stage of early hydrogen released under the surge line double end guillotine break, the FA number of pressurizer room is higher than 1 ,the other rooms'FA numbers and DDT numbers are all lower than 1 .That means in the conditions we studied,all the room are without DDT risk.What's more,the hydrogen density of the broken room is mainly influenced by the source of hydrogen density and entrainment function of the mixture gases,the hydrogen density differences at different points are significant.The hydrogen density in the containment dome presented layered structure and with the time going on the layered structure will be lower and lower,and at last the hydrogen density in the containment dome became well-distributed.