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严重事故下堆芯熔融物行为与现象研究
Studies on Corium Behavior and Phenomenology under Severe Accident Conditions
【摘要】 严重事故下堆内晚期进程的堆芯熔融物行为与现象对三代核电广泛采用的熔融物堆内滞留(IVR)技术有决定性影响,但由于其复杂性,对于该进程的一些重要现象认知严重不足,有些研究在国内处于半空白状态。本文阐述严重事故堆内晚期进程遗留问题的研究现状,并针对碎片床形成和再熔化、分层熔池对流换热、熔池形态演变、堆芯材料及熔融物物性数据库等关键科学问题开展模型开发与实验研究。本文的研究及预期成果不仅填补国内部分研究领域的空白,还有助于挖掘IVR技术潜力和严重事故分析软件开发,对实现核电从设计上"实际消除大规模放射性释放"具有重要意义。
【Abstract】 Motivated by the interest in understanding of late-phase in-vessel severe accident progression and qualification of in-vessel melt retention strategy,which is widely employed in Gen-Ⅲ reactor design,this project is to investigate the corium behavior and phenomena in the lower head of a reactor pressure vessel(RPV) during postulated severe accidents, including debris bed formation and remelting, melt pool formation and evolution, stratified melt pool convection and heat transfer. A database of corium properties is also to be developed. So far in addition to analytical work(modeling and numerical simulation), a series of test facilities has been designed and under construction or commissioning,most of which are the first of their kinds in terms of operational parameters or scales. It is foreseen the experimental results will help fill the knowledge gaps in the corresponding topical areas, providing insights and databases for modeling of the aforementioned severe accident phenomena.
【Key words】 severe accident； corium； fuel coolant interactions； debris bed； melt pool；
- 【文献出处】 中国基础科学 ,China Basic Science , 编辑部邮箱 ,2021年03期
- 【分类号】TM623
- 【下载频次】285