Abstract
研究严重事故工况下堆芯熔融物在一回路内的迁移及分布特性对于制定严重事故缓解措施及应急策略具有一定意义。本文通过定义熔融物颗粒的产生条件、入口速度、重力、粘性力、粒子数密度计算模型，完成粒子法程序MPS中固体颗粒物及铅/铅铋流体计算模型的开发。利用改进后的程序计算Zr-4合金碎片及二氧化铀碎片在不同的冷却剂流速及冷却剂粘性条件下的运动行为，分析熔融物密度、冷却剂流速、冷却剂粘性对熔融物迁移行为的影响，初步验证了应用粒子法开展熔融物运动行为研究的可行性，为后续研究及实验验证提供了基础。 Investigation on the migration and distribution characteristics of the core molten debri in primary loop under severe accident is significant for the development of accident mitigation and emergency response strategies. Solid debris and lead/lead and bismuth calculation model is developed through defining the debri generation conditions, inlet velocity, gravity, viscous force, and particle number density model. Transportation behavior of Zr-4 alloy debri and uranium dioxide in lead coolant under different coolant velocity and viscosity are simulated with modified MPS code; effects of debri density, coolant mass flow rate and viscosity on transportation of debri are analyzed. Feasi-bility of the application of MPS method in the investigation of molten debri transportation behavior in lead coolant is preliminarily verified, which also provides the basis for subsequent further re-search and experimental validation.
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