Transient behavior of oxide fuels with controlled microstructure and Cr2O3 additive

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj Materials Degradation Pub Date : 2024-07-16 DOI:10.1038/s41529-024-00486-2

Dong Zhao, Heng Ban, Kun Yang, Andre Broussard, Mingxin Li, Edward J. Lahoda, Jie Lian

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Abstract

Microstructure and Cr2O3 doping profoundly impact the thermal-mechanical properties and fracture of oxides fuels. It is a challenge to study the transient behavior of nuclear fuels under loss-of-coolant-event (LOCA). In this study, the crack behavior of UO2 pellets with controlled grain structure and Cr2O3 doping was tested with rapid power ramping (300−900 °C per min) mimicking a prototypical LOCA heating profile. Dense micron-sized UO2 pellets display well-maintained integrity without cracking with the ramping up to 1500 °C at a heating rate of 8 °C per second. Fracture occurs in both pure and Cr2O3-doped dense nano-sized UO2 pellets. The Cr2O3 doped oxide fuel pellet with a larger grain size (~ 22.2 μm) displays the best performance under LOCA testing due to its highest thermal conductivity under high temperature. FEA calculations suggest a temperature gradient across the fuel pellet during transient testing, resulting in residual stress and cracking, which can be correlated with their thermal-mechanical properties.

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具有可控微观结构和 Cr2O3 添加剂的氧化物燃料的瞬态行为

微观结构和 Cr2O3 掺杂对氧化物燃料的热机械性能和断裂有深远影响。研究失芯事件（LOCA）下核燃料的瞬态行为是一项挑战。在这项研究中，模拟原型 LOCA 加热曲线，测试了具有受控晶粒结构和掺杂 Cr2O3 的二氧化铀球团在快速功率斜坡（每分钟 300-900°C ）下的裂纹行为。以每秒 8 ℃ 的升温速度升温到 1500 ℃ 时，致密的微米级二氧化铀球团显示出良好的完整性，没有出现裂纹。纯的和掺杂Cr2O3的致密纳米级二氧化铀颗粒都会发生断裂。晶粒尺寸较大（约 22.2 μm）的掺杂 Cr2O3 氧化物燃料颗粒在 LOCA 试验中表现最佳，因为它在高温下具有最高的热导率。有限元分析计算表明，在瞬态测试期间，燃料芯块上会出现温度梯度，从而导致残余应力和裂纹，这与其热机械性能有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

npj Materials Degradation MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

7.80

自引率

7.80%

发文量

审稿时长

6 weeks

期刊介绍： npj Materials Degradation considers basic and applied research that explores all aspects of the degradation of metallic and non-metallic materials. The journal broadly defines ‘materials degradation’ as a reduction in the ability of a material to perform its task in-service as a result of environmental exposure. The journal covers a broad range of topics including but not limited to: -Degradation of metals, glasses, minerals, polymers, ceramics, cements and composites in natural and engineered environments, as a result of various stimuli -Computational and experimental studies of degradation mechanisms and kinetics -Characterization of degradation by traditional and emerging techniques -New approaches and technologies for enhancing resistance to degradation -Inspection and monitoring techniques for materials in-service, such as sensing technologies