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Evaluation of ATFs in core degradation of a PWR in unmitigated SBLOCA
Annals of Nuclear Energy ( IF 1.9 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.anucene.2020.107961
H. Ebrahimgol , M. Aghaie , A. Zolfaghari

Abstract Accident tolerant fuels (ATFs) are designed to mitigate damaging interaction of hot steam and fuel clad during off-normal condition. These materials can withstand against high temperatures for longer period of time. They have lower oxidation kinetics, higher resistance to core degradation and lower hydrogen pick-up. The main purpose of this study is thermal-hydraulics evaluation of ATFs during an unmitigated SBLOCA in a PWR. In this research, the MELCOR has been used to assess the impact of ATFs on core degradation and relocation in absence of active emergency core cooling systems. In this analysis, ATF materials (SiC and FeCrAl) are applied into the code and thermal performance of Zircaloy-4, SiC and FeCrAl are compared. The main thermal characteristics of materials are introduced and consequences of the core degradation consist of the in-vessel hydrogen generation, oxidation heat, lower head failure and debris mass are evaluated. The results demonstrate that the hydrogen generation in the unmitigated SBLOCA decreased by 57% and 55% for FeCrAl alloy and SiC, respectively. The energy generation due to oxidation of core materials reduced by 88% and 86% for FeCrAl and SiC, respectively. The debris mass of ATFs decreased ~1.7 tons and lower head of the ATFs core failed 8470 s and 7650 s later than Zircaloy-4 for FeCrAl and SiC, respectively.

中文翻译:

在未缓解的 SBLOCA 中对压水堆堆芯降解中 ATF 的评估

摘要 事故容忍燃料 (ATF) 旨在减轻非正常条件下热蒸汽和燃料包壳的破坏性相互作用。这些材料可以承受较长时间的高温。它们具有较低的氧化动力学、较高的抗核心降解能力和较低的氢吸收率。本研究的主要目的是在 PWR 中完全缓解 SBLOCA 期间对 ATF 进行热工水力评估。在这项研究中,MELCOR 已被用于评估在没有主动应急堆芯冷却系统的情况下 ATF 对堆芯退化和重新定位的影响。在此分析中,将 ATF 材料(SiC 和 FeCrAl)应用于代码中,并比较了 Zircaloy-4、SiC 和 FeCrAl 的热性能。介绍了材料的主要热特性,并评估了核心退化的后果,包括容器内氢气的产生、氧化热、较低的水头故障和碎片质量。结果表明,对于 FeCrAl 合金和 SiC,未缓解的 SBLOCA 中的氢生成分别降低了 57% 和 55%。对于 FeCrAl 和 SiC,由于核心材料氧化而产生的能量分别减少了 88% 和 86%。对于 FeCrAl 和 SiC,ATF 的碎片质量减少了约 1.7 吨,ATF 核心的下水头比 Zircaloy-4 晚了 8470 秒和 7650 秒。分别。对于 FeCrAl 和 SiC,由于核心材料氧化而产生的能量分别减少了 88% 和 86%。对于 FeCrAl 和 SiC,ATF 的碎片质量减少了约 1.7 吨,ATF 核心的下水头比 Zircaloy-4 晚了 8470 秒和 7650 秒。分别。对于 FeCrAl 和 SiC,由于核心材料氧化而产生的能量分别减少了 88% 和 86%。对于 FeCrAl 和 SiC,ATF 的碎片质量减少了约 1.7 吨,ATF 核心的下水头比 Zircaloy-4 晚了 8470 秒和 7650 秒。
更新日期:2021-03-01
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