【摘要】 快堆发生堆芯熔融事故,会形成熔融池和沸腾池,熔融物在向相邻组件中传播时,是否造成相邻组件径向方向的全堵是事故进一步发展的关键。为了弄清熔融物在相邻组件中传播的机理,本文基于英国SMPR系列实验中的管排型实验装置,分别建立了导热冻结和整体冻结的数学模型,并用英国SMPR系列实验中的A2、A3实验数据进行了验证。结果表明,导热冻结和整体冻结都会使熔融物停止传播;在固化壳生长机理和熔融物温降等相关因素的共同作用下,压差越小,越偏向于导热冻结;导热冻结数学模型预测的固体结构温度及固化壳生长更符合实验结果。更多还原

【Abstract】 Running under the accident condition,the fuel pins of the LMFBR will melt,which then lead to the molten pool and boiling pool scenarios.When the molten material propagates into the neighbor subas-semblies,the key point is that whether the neighbor subassembly will be total blocked radially.To make the conduction is the prior mechanism;and the conduction freezing model is better than bulk freezing model in the prediction of the structure temperature and the crust growth.penetration mechanism in neighbor subassembly clear,a conduction freezing model and a bulk freezing model are established which are validated on the UK SMPR experiment.The result shows that both conduc-tion freezing and bulk freezing mechanism will be the reason of blocking;and when the pressure is low,the更多还原