【摘要】 快堆在严重事故下,将导致燃料及结构材料形成熔融池和沸腾池,熔融物最终熔穿组件盒壁,向盒外曼延。为弄清混合熔融物传播的机理问题,本文采用了机理建模的方法,建立了导热冻结和整体冻结两种机理的数学模型,并与英国的SES堆外实验进行了验证,和实验结果吻合较好。通过与法国GEYSER实验中验证过的单组分模型比较,分析出钢成分在混合熔融物的冻结中所起的作用,得出了双组分熔融物传播的相关结论。更多还原

【Abstract】 Under serious accidental conditions in fast reactors,the fuel pins will be molten which finally lead to formation of molten pool and boiling pool.Later on,the molten material will break the wrapper of the subassembly.In order to understand the penetration mechanism of the molten material,two mechanism mod-els are established to simulate the penetration process: the conduction-freezing model and the bulk-freezing model.And they are validated on the UK SES out-of-pile experiments.In comparison with the single-material freezing model which is validated on GEYSER experiments,the influence of steel on freezing process is ana-lyzed,and finally some conclusions relative to the penetration are derived.更多还原