熔融铅锡合金与冷却剂相互作用热细粒化研究  

Thermal fragmentation study on interaction of melton Pb-Sn alloy and coolant

作　　者：李阁 佟立丽[1] LI Ge;TONG Lili(School of Mechanical and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学机械与动力工程学院

出　　处：《核技术》2020年第3期66-72,共7页Nuclear Techniques

基　　金：国家自然科学基金(No.U1967202)资助~~

摘　　要：堆芯熔融物与冷却剂相互作用(Fuel Coolant Interaction,FCI)是核反应堆严重事故下可能发生的严重问题之一。为进一步了解FCI现象及解明热细粒化过程的关键影响因素,本文通过可视化实验方法,采用铅锡合金模拟材料开展实验研究。采用高速摄像系统对反应过程进行图像采集,通过计算熔融物所占像素点的面积得到熔融物的截面积;收集反应碎片,从实验产物形貌、相互作用过程状态及熔融物周围气体分布三个方面对影响热细粒化过程的熔融物初始温度、质量及冷却剂温度展开研究。结果对比分析表明:熔融物温度升高,热细粒化程度先增加后减小;初始水体量一定的情况下,熔融物质量增加,可能导致熔融物细粒化程度降低;冷却剂过冷度增加,热细粒化程度增加。[Background] Fuel coolant interaction(FCI) is one of the possible serious problems in severe accidents of nuclear power plants. [Purpose] This study aims to further understand FCI phenomenon and key factors affecting the process of thermal fine fragmentation. [Methods] Visualized experiments were performed using Pb-Sn alloy.Images of the reaction process were acquired through a high-speed video system, the area of pixels occupied by the molten materials was calculated to obtain the cross-sectional area of interaction zone. Melt debris was collected to investigate, the effects of initial melt temperature, melt mass and coolant temperature from three aspects: the morphology of experimental products, the state of interaction process and the gas distribution around molten materials. [Results & Conclusions] The comparative analysis results show that with the increase of melt temperature, thermal fine fragmentation is enhanced first and then reduced. With fixed water volume, improving the quality of the molten materials may lead to insufficient thermal fragmentation. High sub-cooling temperature is beneficial to thermal fine fragmentation of molten materials in FCI process.

关 键 词：熔融物与冷却剂相互作用 热细粒化 严重事故 

分 类 号：TL364.4[核科学技术—核技术及应用]