Fuel performance modelling of Cr-coated Zircaloy cladding under DBA/LOCA conditions

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Annals of Nuclear Energy Pub Date : 2024-10-03 DOI:10.1016/j.anucene.2024.110950

Pau Aragón , Francisco Feria , Luis E. Herranz , Arndt Schubert , Paul Van Uffelen

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Abstract

Chromium coatings are being developed for advanced technology fuel (ATF) claddings, offering negligible corrosion during normal operation, improved resistance to high-temperature steam oxidation, and superior high-temperature strength, the latter two being of utmost relevance during design basis accidents (DBAs). Demonstrating the improved response of Cr-coated Zircaloy requires the development or extension of fuel performance codes to coating simulations.

In this work, material models and correlations for Cr-coated Zircaloy cladding have been derived or obtained from the literature and implemented into TRANSURANUS and the FRAPTRAN-TUmech suite. These extended tools have been used to simulate two complementary LOCA tests: QUENCH-L1 rod 4 (out-of-pile bundle test on fresh Zircaloy cladding) and IFA-650.10 (in-pile single rod test on high-burnup Zircaloy-UO₂ fuel), enabling a gradual cross-verification of results between codes and a comparative performance analysis between coated and uncoated cladding.

The results indicate negligible impact of coating properties other than creep on the burst time. While the superior high-temperature creep resistance of coated cladding slightly delays the burst time, additional burst data would be necessary to draw sound conclusions on the balloon size. Regarding the modelling approach, treating the coated cladding as a composite material through the definition of effective properties might result in worse performance relative to uncoated cladding, contradicting experimental observations. Therefore, the separate modelling of the coating and the cladding is recommended.

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DBA/LOCA 条件下铬涂层锆合金包层的燃料性能建模

目前正在开发用于先进技术燃料（ATF）包层的铬涂层，该涂层在正常运行期间的腐蚀性可以忽略不计，具有更强的抗高温蒸汽氧化能力和卓越的高温强度，后两者在设计基础事故（DBA）期间具有极大的相关性。要证明铬涂层锆合金的响应性能得到改善，需要开发或扩展燃料性能代码，以进行涂层模拟。在这项工作中，从文献中推导或获得了铬涂层锆合金包层的材料模型和相关性，并将其应用到 TRANSURANUS 和 FRAPTRAN-TUmech 套件中。这些扩展工具已用于模拟两个互补的 LOCA 试验：QUENCH-L1杆4（对新鲜锆合金包层进行的桩外束试验）和IFA-650.10（对高燃耗锆合金-UO2燃料进行的桩内单杆试验），从而能够逐步交叉验证不同代码之间的结果，并对有涂层和无涂层包层的性能进行比较分析。虽然涂层覆层的高温抗蠕变性能优越，会稍微延迟爆破时间，但要就气球大小得出合理结论，还需要更多的爆破数据。关于建模方法，通过定义有效特性将涂层覆层视为复合材料可能会导致其性能不如无涂层覆层，这与实验观察结果相矛盾。因此，建议将涂层和包层分开建模。

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

Annals of Nuclear Energy 工程技术-核科学技术

CiteScore

4.30

自引率

21.10%

发文量

632

审稿时长

7.3 months

期刊介绍： Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.