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针对次临界能源堆包层燃料结构,修改了MELCOR程序堆芯导热模型,建立次临界能源包层及其冷却回路的严重事故分析模型。在验证了建模方法合理性的基础上,用MELCOR程序开展全厂断电事故导致的严重事故响应特性研究。计算结果表明:包层燃料区功率密度越高,裸露时间越早,燃料熔化越快;内包层上部燃料区域首先出现熔化,外包层熔化时间稍晚,且熔化都发生在所在区域裸露2 h以后;锆水反应对事故进程影响明显,部分燃料区域锆水反应释热成为燃料温度持续升高甚至熔化的主要热源。
Aimed at the sub-critical energy stack cladding fuel structure, the core thermal model of MELCOR program was modified to establish a serious accident analysis model of sub-critical energy cladding and its cooling circuit. On the basis of verifying the rationality of the modeling method, MELCOR program was used to study the serious accident response characteristics caused by the blackout of the whole plant. The results show that the higher the power density of the cladding fuel zone, the earlier the exposure time and the faster the fuel melts. The upper fuel zone of the inner cladding melts first, and the melting time of the outer cladding later, and the melting occurs in the exposed area for 2 h Zirconium reaction has a significant impact on the accident process. The release of zirconium-water reaction in some fuel areas has become the main source of heat for the fuel temperature to continue to rise or even melt.