严重事故下安全壳排气对乏燃料厂房氢气风险影响研究

Study on Influence of Containment Venting on Hydrogen Risk of Spent Fuel Building under Severe Accident

以我国某三代压水堆核电厂为例,选取了2个典型严重事故工况,采用严重事故一体化程序MAAP开展建模与计算,对安全壳排气的过程及对乏燃料厂房造成的氢气风险进行了分析。结果表明,如果不考虑乏燃料厂房的通风系统,从安全壳内释放的混合气体由于水蒸气的冷凝,会对乏燃料厂房造成一定的氢气风险;如果考虑乏燃料厂房通风系统的作用,乏燃料厂房的氢气风险将会消除。

Taking a domesticⅢgeneration pressurized water reactor nuclear power plant as an example,two typical severe accident conditions are selected,modeling and calculation with Modular Accident Analysis Program(MAAP)are carried out,and the process of containment venting and the hydrogen risk to the spent fuel building are analyzed.The results show that if the ventilation system of the spent fuel building is not considered,the mixed gas released from the containment will cause a certain hydrogen risk to the spent fuel building due to the condensation of water vapor.If the role of the ventilation system of the spent fuel building is considered,the hydrogen risk in the spent fuel building will be eliminated.