严重事故下安全壳内氢气行为与风险分析  

Analysis of Hydrogen Behavior and Risk during LB-LOCA Severe Accidents

作　　者：毕金生[1] 靖剑平[1] 乔雪冬[1] 胡文超[1] 王闯[1] 郭添榕 

机构地区：[1]环境保护部核与辐射安全中心,北京100082 [2]辽宁省实验中学分校,沈阳110148

出　　处：《核安全》2017年第4期46-52,共7页Nuclear Safety

基　　金：国家科技重大专项;项目编号:2017ZX06004002-001

摘　　要：福岛事故后的核电厂安全审评过程中,国家核安全局对于严重事故下的氢气安全问题提出了更高的要求,从满足当前高标准的氢气安全要求的角度出发,有必要对安全壳内氢气行为开展更为细致深入的研究,开展氢气的三维分析,为集总参数程序的分析结果提供有益补充。本文采用一体化严重事故分析程序和流体力学程序对国产先进压水堆核电厂进行系统建模,选取大破口触发的严重事故序列,对严重事故工况下的氢气行为及氢气控制系统性能进行分析评价。首先采用一体化严重事故分析程序计算氢气产生源项、氢气产生速率和安全壳内氢气浓度分布等,评价安全壳隔间内的氢气风险。并采用计算流体力学程序,进一步对安全壳内重要隔间的氢气分布进行三维分析,研究安全壳内氢气和水蒸汽的行为,获得重要隔间内的流场、温度场、压力场、氢气分布及浓度变化等计算结果。CFD程序在计算气体分布方面要比集总参数程序更加精确和详细,通过更精细地模拟安全壳内的氢气行为,可以为集总参数程序的计算结果提供补充,为氢气控制系统的设计优化和严重事故氢气风险管理等提供有力的支持。Fukushima accident after the nuclear power plant safety review process, the Nuclear Safety A- gency for serious accidents under the hydrogen safety issues put forward higher requirements, from the current high standards of hydrogen safety requirements from the point of view, it is necessary inside the containment Hydrogen behavior to carry out more detailed and in - depth study, to carry out three - di-mensional analysis of hydrogen, lumped parameter for the analysis of the results provided a useful supple-ment In this paper, the integrated accident fault analysis program and the fluid mechanics program are used to systematically model the domestic advanced pressurized water reactor nuclear power plant, and the serious accident sequence triggered by the big break is selected to analyze the hydrogen behavior and the hydrogen control system performance under severe accident conditions Evaluation. CFD program is more accurate and detailed in calculating the gas distribution than the lumped parameter program. By more de-tailed simulation of the hydrogen behavior in the containment, the calculation results of the lumped param-eter program can be supplemented by the design optimization of the hydrogen control system and Severe accident hydrogen risk management to provide strong support

关 键 词：严重事故 大破口 氢气行为 氢气风险 

分 类 号：TL364[核科学技术—核技术及应用]