Numerical Simulation of Ex-Vessel Steam Explosion Based on 1000 MW Level PWR Nuclear Power Plant
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摘要: 以1000 MW级压水堆核电厂为分析对象,建立三维几何模型,采用三维多相计算流体力学程序MC3D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、冲量变化趋势及破口位置和破口大小对蒸汽爆炸产生冲量大小的影响。分析结果表明,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;压力容器下封头圆心和破口位置的连线与压力容器对称轴的夹角为45°、破口直径为0.7 m时,蒸汽爆炸所带来风险的最大。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 dimensional multiphase fluid analysis code MC3 D has been used based on the structural and environmental characteristics of the sever accident state of 1000 MW level PWR Nuclear Power Plant with the consideration of both pressure variation and impulse variation. Analysis of effect of break’s size and its location is also included. The results indicate that the explosion stage creates a high level and sharp pressure peak which threatens the integrity of the reactor cavity structure. In addition, when the intersection angle between axis of the vessel and location of the break is 45° and size of the break is 0.7 m, the risk of steam explosion is the greatest.
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Key words:
- Steam explosion /
- Multiphase fluid /
- Severe accident /
- Break
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