百万千瓦级压水堆大破口事故下氢气源项及缓解措施研究  

Study on Hydrogen Source and Mitigation Measures under LB-LOCA for 1000 MWe PWR Nuclear Power Plant

作　　者：袁显宝[1] 陈文祥 石强[2,3] 张永红 魏靖宇 张彬航[2,3] 毛璋亮 杨森权 YUAN Xianbao;CHEN Wenxiang;SHI Qiang;ZHANG Yonghong;WEI Jingyu;ZHANG Binhang;MAO Zhangliang;YANG Senquan(School of Science,China Three Gorges University,Yichang of Hubei Prov.443002,China;School of Mechanical Engineering,China Three Gorges University,Yichang of Hubei Prov.443002,China;Hubei Key Laboratory of Hydroelectric Machinery Design&Maintenance,Yichang of Hubei Prov.443002,China;China Nuclear Power Operation Technology Corporation,Ltd.,Wuhan of Hubei Prov.430074,China)

机构地区：[1]三峡大学理学院,湖北宜昌443002 [2]三峡大学机械与动力学院,湖北宜昌443002 [3]湖北省水电机械设备设计与维护重点实验室三峡大学,湖北宜昌443002 [4]中核武汉核电运行技术股份有限公司,湖北武汉430074

出　　处：《核科学与工程》2023年第5期1131-1137,共7页Nuclear Science and Engineering

基　　金：国家自然科学基金(11805112,12175116)。

摘　　要：压水堆大破口事故下会发生锆水反应以及熔融物与混凝土反应,产生氢气的同时伴随大量热量释放,这会对安全壳完整性产生巨大威胁。本文对锆合金氧化机理模型进行优化,添加了锆合金与空气氧化机理模型并优化了锆水反应计算模型,使用优化后的一体化程序,研究百万千瓦级压水堆核电站在发生大破口叠加高、低压安注失效事故下氢气源项及缓解措施。分析表明,氧化计算模型优化后堆芯产氢量减少了26.3 kg。堆腔注水可以持续带走压力容器内的热量,保证压力容器完整并防止熔融物与混凝土反应;氢气复合器与点火器联合使用,可以更有效、更快速降低安全壳内氢气浓度,防止氢气在安全壳内聚集,从而保证安全壳的完整性。Under the large break accident of PWR,zirconium water reaction and the reaction between molten material and concrete will occur,which will generate hydrogen and release a large amount of heat, which will pose a great threat to the integrity of the containment. In thispaper, the zirconium alloy oxidation mechanism model is optimized. The zirconium alloy andair oxidation mechanism model is added, and the zirconium water reaction calculation model isalso optimized. The optimized integrated program is used to study the hydrogen source termsand mitigation measures in the case of large break superimposed high and low pressure safetyinjection failure accidents in a 1 000 MWe PWR nuclear power plant. The analysis shows thatthe hydrogen production of the reactor core is reduced by 26.3 kg after the optimization of theoxidation mechanism, and the hydrogen production can be calculated more accurately. Thewater injection in the reactor cavity can continuously take away the heat in the pressure vessel,ensure the integrity of the pressure vessel and prevent the reaction between the melt and theconcrete. The combined use of hydrogen recombiner and igniter can reduce the hydrogenconcentration in the containment more effectively and quickly, prevent hydrogen fromaccumulating in the containment, and thus ensure the integrity of the containment.

关 键 词：一体化程序 大破口 氢气源项 缓解措施 

分 类 号：TL48[核科学技术—核技术及应用]