Analysis of Pressure and Impulse Distribution in the Case of Ex-Vessel Steam Explosion
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摘要: 使用三维多相计算流体力学(CFD)计算程序MC3D,对1000 MW级核电厂岭澳核电站二期安全壳内部结构建模。对包括粗混合和蒸汽爆炸过程在内的压力容器外熔融燃料与冷却水相互作用过程进行研究,主要研究蒸汽爆炸过程中堆腔内不同位置的压力、冲量变化趋势以及触发时间对爆炸产生冲量大小的影响。计算结果表明,粗混合阶段堆腔内压力变化较小,持续时间长;蒸汽爆炸过程持续时间短,压力变化极大,且距离蒸汽爆炸触发位置越接近,压力峰值和冲量越大。蒸汽爆炸过程产生巨大压力波,将对堆腔结构的完整性造成极大威胁。此外,区域中与冷却水接触的熔融液滴的体积总和越大,在该时刻触发蒸汽爆炸所产生压力脉冲也就越大。Abstract: In order to investigate the pressure distribution outside the vessel during the process of steam explosion including both the premixing stage and explosion stage,a three dimension multiphase fluid analysis code MC3D has been used based on the structural and environmental characteristics of the sever accident state of 1000 MW level PWR Ling’ao Nuclear Power Station Phase II with the consideration of both pressure variation and impulse variation.The results indicate that the process of premixing has a low level pressure variation with a long duration.On the contrary,the explosion stage creates a high level and sharp pressure peak which threatens the integrity of the reactor cavity structure.In addition,the mass of the melt-drop con-tacts the coolant all over the calculating cells has a significant effect regarding the magnitude of the impulse created by the steam explosion.
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Key words:
- Steam explosion /
- Premixing /
- Multiphase fluid /
- CFD /
- Severe accident
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