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Analysis of neutron physics and thermal hydraulics for fuel assembly of small modular reactor loaded with ATFs
Annals of Nuclear Energy ( IF 1.9 ) Pub Date : 2020-11-13 , DOI: 10.1016/j.anucene.2020.107957
Honghao Yu , Jiejin Cai , Sihong He , Xuezhong Li

The new small modular reactor (SMR) NuScale has been in the approval process for Nuclear Regulatory Commission by its off-site fabrication and assembly and good safety performance. To ensure the safety of the fuel rod the rod ejection accident at the beginning of cycle (BOC) and the end of cycle (EOC), the traditional fuel rod is replaced by accident tolerant fuels (ATFs). Neutron physics and thermal hydraulic analysis need to be performed before the actual application to ensure feasibility. In this paper, neutron physics and thermal hydraulics for SMR loaded with ATFs are analyzed. The results show that the 4% uranium enriched ATF pellets can meet the lifetime requirements, and the application of silicon uranium fuel pellets can significantly reduce maximum fuel centerline temperature (MFCT). Safety margin analysis was also performed for different ATF material failure criteria. The results show that ATF materials can enhance the safety of NuScale reactors.



中文翻译:

装有ATF的小型模块化反应堆燃料组件的中子物理和热力学分析

新型小型模块化反应堆(SMR)NuScale的异地制造和组装以及良好的安全性能,已经进入了核监管委员会的审批过程。为了确保燃料棒的安全,在周期开始(BOC)和周期结束(EOC)时发生棒弹出事故,传统的燃料棒被事故容忍燃料(ATF)代替。在实际应用之前,需要进行中子物理和热力水力分析,以确保可行性。本文分析了装有ATF的SMR的中子物理和热力学。结果表明,富铀4%的ATF颗粒可以满足使用寿命要求,而硅铀燃料颗粒的应用可以显着降低最高燃料中心线温度(MFCT)。还针对不同的ATF材料失效标准进行了安全裕度分析。结果表明,ATF材料可以增强NuScale反应堆的安全性。

更新日期:2020-11-13
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