An in-house code,CONTHAC-3D,was developed to calculate and analyze thermal-hydraulic phenomena in containments during severe accidents.CONTHAC-3D is a three-dimensional computational fluid dynamics code that can be ap...An in-house code,CONTHAC-3D,was developed to calculate and analyze thermal-hydraulic phenomena in containments during severe accidents.CONTHAC-3D is a three-dimensional computational fluid dynamics code that can be applied to predict gas flow,diffusion,and steam condensation in a containment during a severe hypothetical accident,as well as to obtain an estimate of the local hydrogen concentration in various zones of the containment.CONTHAC-3D was developed using multiple models to simulate the features of the proprietary systems and equipment of HPR1000 and ACP100,such as the passive cooling system,passive autocatalytic recombiners and the passive air cooling system.To validate CONTHAC-3D,a GX6 test was performed at the Battelle Model Containment facility.The hydrogen concentration and temperature monitored by the GX6 test are accurately predicted by CONTHAC-3D.Subsequently,the hydrogen distribution in the HPR1000 containment during a severe accident was studied.The results show that the hydrogen removal rates calculated using CONTHAC-3D for different types of PARs agree well with the theoretical values,with an error of less than 1%.As the accident progresses,the hydrogen concentration in the lower compartment becomes higher than that in the large space,which implies that the lower compartment has a higher hydrogen risk than the dome and large space at a later stage of the accident.The amount of hydrogen removed by the PARs placed on the floor of the compartment is small;therefore,raising the installation height of these recombiners appropriately is recommended.However,we do not recommend installing all autocatalytic recombiners at high positions.The study findings in regard to the hydrogen distribution in the HPR1000 containment indicate that CONTHAC-3D can be applied to the study of hydrogen risk containment.展开更多
为了更好地研究事故条件下非能动安全壳热量导出系统作用下安全壳内的热工水力行为,中国核电工程有限公司搭建安全壳综合性能实验装置(PlAtform for iNteGral TH behaviour of containment,PANGU)并开展了3种事故序列大破口事故(堆芯未...为了更好地研究事故条件下非能动安全壳热量导出系统作用下安全壳内的热工水力行为,中国核电工程有限公司搭建安全壳综合性能实验装置(PlAtform for iNteGral TH behaviour of containment,PANGU)并开展了3种事故序列大破口事故(堆芯未熔)、大破口事故(堆芯熔化)和全厂断电事故下的实验研究。采用GOTHIC程序建立安全壳综合性能实验装置数值计算模型,并针对已开展的3个实验进行数值计算研究,得出结论如下:对于3个事故序列,程序计算的穹顶区域水蒸气浓度与实验值趋势上保持一致,特别是长期阶段水蒸气浓度实验值与计算值符合良好;计算模型所计算的安全壳内温度压力无论是峰值还是长期值均与实验值保持在较小的误差范围内;简化后的PCS模型计算的PCS功率略低于实验测量的PCS功率,72 h内计算的PCS总排热量与实验测量值相当。本文研究结果可为“华龙一号”PCS系统计算分析提供理论支持。展开更多
文摘An in-house code,CONTHAC-3D,was developed to calculate and analyze thermal-hydraulic phenomena in containments during severe accidents.CONTHAC-3D is a three-dimensional computational fluid dynamics code that can be applied to predict gas flow,diffusion,and steam condensation in a containment during a severe hypothetical accident,as well as to obtain an estimate of the local hydrogen concentration in various zones of the containment.CONTHAC-3D was developed using multiple models to simulate the features of the proprietary systems and equipment of HPR1000 and ACP100,such as the passive cooling system,passive autocatalytic recombiners and the passive air cooling system.To validate CONTHAC-3D,a GX6 test was performed at the Battelle Model Containment facility.The hydrogen concentration and temperature monitored by the GX6 test are accurately predicted by CONTHAC-3D.Subsequently,the hydrogen distribution in the HPR1000 containment during a severe accident was studied.The results show that the hydrogen removal rates calculated using CONTHAC-3D for different types of PARs agree well with the theoretical values,with an error of less than 1%.As the accident progresses,the hydrogen concentration in the lower compartment becomes higher than that in the large space,which implies that the lower compartment has a higher hydrogen risk than the dome and large space at a later stage of the accident.The amount of hydrogen removed by the PARs placed on the floor of the compartment is small;therefore,raising the installation height of these recombiners appropriately is recommended.However,we do not recommend installing all autocatalytic recombiners at high positions.The study findings in regard to the hydrogen distribution in the HPR1000 containment indicate that CONTHAC-3D can be applied to the study of hydrogen risk containment.
文摘为了更好地研究事故条件下非能动安全壳热量导出系统作用下安全壳内的热工水力行为,中国核电工程有限公司搭建安全壳综合性能实验装置(PlAtform for iNteGral TH behaviour of containment,PANGU)并开展了3种事故序列大破口事故(堆芯未熔)、大破口事故(堆芯熔化)和全厂断电事故下的实验研究。采用GOTHIC程序建立安全壳综合性能实验装置数值计算模型,并针对已开展的3个实验进行数值计算研究,得出结论如下:对于3个事故序列,程序计算的穹顶区域水蒸气浓度与实验值趋势上保持一致,特别是长期阶段水蒸气浓度实验值与计算值符合良好;计算模型所计算的安全壳内温度压力无论是峰值还是长期值均与实验值保持在较小的误差范围内;简化后的PCS模型计算的PCS功率略低于实验测量的PCS功率,72 h内计算的PCS总排热量与实验测量值相当。本文研究结果可为“华龙一号”PCS系统计算分析提供理论支持。
