CFD Analysis on Hydrogen Risk in Qinshan II NPP
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摘要: 利用计算流体力学(CFD)程序GASFLOW模拟了波动管大破口事故发生后7000s内装有22台氢气复合器的秦山二期核电站安全壳内的水蒸汽及氢气行为,得到了不同阶段的特征性流场及氢气浓度的分层情况,给出了所采用的复合器布置方案的稳定消氢速率为20g/s,并指出了破口所在蒸汽发生器隔间内发生氢气燃烧火焰加速的可能性。同时,计算结果表明,安全壳内构筑物吸热带走了大部分从一回路释放的热量;压力变化同时受气体总质量(主要是水蒸汽质量)与温度的控制。Abstract: The computational fluid dynamics code GASFLOW is applied to simulate the steam/hydrogen behavior inside the containment of Qinshan II NPP, installed with 22 Passive Automatic Recombiners （PAR）, during the first 7 000 seconds of a postulated surge line Large Break LOCA accident. The results imply that the structures remove large amount of heat from the containment atmosphere and that the pressure variation is controlled by the inventory of gas （mainly steam） and the temperature. Two typical flow patterns and hydro-gen strafication are found in the containment during the accident. The stable recombination capability of the given arrangement is about 20 g/s. The possibility of flame acceleration is indicated.
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Key words:
- Nuclear power pant /
- Hydrogen risk /
- Severe accidents /
- Steam behavior /
- Recombiner
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