百万千瓦级压水堆严重事故下局部隔间氢气风险分析

核安全法规要求控制严重事故下核电厂安全壳内的氢气浓度。除安全壳整体外,局部隔间的氢气浓度同样是关注的重点。本文采用一体化严重事故分析程序对百万千瓦级压水堆核电厂安全壳局部隔间进行建模,分析了不同事故下的氢气风险。结果表明,严重事故下部分隔间短时间内可能存在燃烧风险。本文对降低燃烧风险的方法进行分析计算和筛选,得出的结论可以为安全壳隔间的设计优化提供参考依据。

Local Compartments Hydrogen Risk Analysis during Severe Accident of 1 000 MWe PWR

The hydrogen concentration control of NPP containment during severe accident is required by nuclear safety laws and regulations.However,except for the whole space of containment,some local compartments are also concerned equally.This paper is based on the hydrogen risk calculation of 1 000 MW PWR containment model during several severe accident sequences,which is developed by the integration severe accident analyses code.The result shows that the hydrogen risk may last a short period in some compartment.The way of risks reduce is analyzed and compared.Result of this paper also could be reference for containment compartment improvement design.