Study on Molten Core-concrete Interactions and Its Influence Factors Analysis

摘要：

In a postulated core melt accident of PWR, if the molten core is not retained in-vessel despite taking severe accident mitigation actions, the core debris will relocate in the reactor cavity region. There, it will interact with the concrete hasemat, and may lead to containment failure through erosion. The combustion or detonation of hydrogen may cause early failure of the containment by thermal and pressure load imposed on RCB (reactor containment building). By using a systematic code, based on the analysis of one severe accident sequence of station blackout (SBO) add steam-driven auxiliary feed water pump failure, the concrete ablation rate and hydrogen generation rate are achieved for the 600MW PWR. As well as some influence factors of molten core-concrete interactions (MCCI) are discussed. It shows that the models of thermal resistance between the debris and the concrete, the configuration of debris layer, and the chemical reaction heat include or exclude the oxides as reactants take much effect on concrete ablation rate. Some paramneters relating to the lower head failure model also have some impacts on concrete ablation rate. As a mitigation action, the effect of wet cavity is also discussed. It seems that the sooner and more water poured into the cavity, the more efficiency the mitigation is.

关键词： Severe Accident Molten Core-concrete Interactions Concrete Ablation Rate Thermal Resistance

作者: Tong Lili Yang Yajun Cao Xuewu

作者单位: School of Nuclear Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China

会议类型: 国际会议

会议名称: ISSNP2008、CSEPC、ISOFIC2008(第二届21世纪和谐核电系统国际会议、第四届电厂控制中认知系统工程方法国际会议暨第三届未来核电厂仪表与控制国际会议)

会议地点: 哈尔滨

会议语种:英文

页码: 295-300

在线出版日期: 2008-09-08（万方平台首次上网日期，不代表论文的发表时间）