Deformation features of fuel rods with mixed uranium–plutonium nitride fuel

IF 0.3 4区工程技术 Q4 NUCLEAR SCIENCE & TECHNOLOGY

Atomic Energy Pub Date : 2025-06-12 DOI:10.1007/s10512-025-01206-y

L. M. Zabudko, A. F. Grachev, S. I. Porollo, E. E. Marinenko, E. A. Zvir, A. V. Belyaeva, F. N. Kryukov, M. V. Skupov

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Abstract

Fuel rods containing a mixed uranium–plutonium nitride (MNUP) fuel were subjected to irradiation in BOR-60 and BN-600 reactors to assess their performance and potential use in BREST-OD-300 and BN-1200M reactors. Post-irradiation examinations revealed that their deformation behavior differs from that of fuel rods with oxide fuel. Nitride fuel rods demonstrated increased axial elongation and cladding ovalization under identical irradiation conditions within the same assembly. Elongation and ovalization studies were carried out for 12 fuel rods with cold-worked ChS68-ID cladding, 38 rods with cold-worked EK164-ID cladding, and 69 rods with EP823-Sh cladding. The fuel rods were irradiated in 17 experimental fuel assemblies, covering a range of maximum fuel burnup from 3.1–9.1% heavy atoms and displacement damage from 26–108 displacements per atom (dpa). The experimental data suggest that axial elongation is predominantly attributable to axial forces that emerge from thermomechanical interactions between the fuel and cladding. These interactions are attributed to the random displacement of pellets and/or their fragments from an axisymmetric position.

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铀-钚混合氮化燃料燃料棒的变形特征

在BOR-60和BN-600反应堆中对含有混合铀-钚氮化燃料（MNUP）的燃料棒进行辐照，以评估其在BREST-OD-300和BN-1200M反应堆中的性能和潜在用途。辐照后检查表明，其变形行为与含氧化物燃料的燃料棒不同。在相同的辐照条件下，氮化燃料棒表现出轴向伸长率和包层卵形化的增加。对12根ChS68-ID包层的冷加工燃料棒、38根EK164-ID包层的冷加工燃料棒和69根EP823-Sh包层的燃料棒进行了延伸和卵圆化研究。燃料棒在17个实验燃料组件中辐照，最大燃料燃耗范围为3.1-9.1%重原子，位移损伤范围为26-108位移/原子（dpa）。实验数据表明，轴向伸长主要是由于燃料和包层之间的热力学相互作用产生的轴向力。这些相互作用归因于球团和/或它们的碎片从轴对称位置的随机位移。

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

Atomic Energy 工程技术-核科学技术

CiteScore

1.00

自引率

20.00%

发文量

100

审稿时长

4-8 weeks

期刊介绍： Atomic Energy publishes papers and review articles dealing with the latest developments in the peaceful uses of atomic energy. Topics include nuclear chemistry and physics, plasma physics, accelerator characteristics, reactor economics and engineering, applications of isotopes, and radiation monitoring and safety.