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稠密栅堆芯的应用涉及到的关键性问题之一是在破口事故下的应急冷却。应用改进程序RELAP5/TIGHT计算和分析两组不同设计方案下的稠密栅堆芯在破口事故下的特性,结果表明:稠密栅堆芯相比普通堆芯,破口事故持续时间更长;再淹没阶段的包壳峰值温度相比喷放阶段的包壳峰值温度更高;堆芯燃料棒中心距与燃料棒外径比值(p/d)对于包壳峰值温度的影响很大;堆芯功率密度的提高会使得对安注流量的需求大大增强。从安全分析的角度来看,不推荐堆芯p/d设计小于1.10。
One of the key issues involved in the application of dense grid cores is emergency cooling under a breach accident. The improved program RELAP5 / TIGHT was used to calculate and analyze the characteristics of the dense grid core under the different design schemes. The results show that the dense grid core has a longer duration than the ordinary core, The peak temperature of the cladding in the submerged phase was higher than that in the discharge phase. The influence of the center distance of the core and the outer diameter of the fuel rod (p / d) on the peak temperature of the cladding was great. The core power Increased density will make the demand for security traffic significantly enhanced. From a safety analysis point of view, the core p / d design of less than 1.10 is not recommended.