Zircaloy-4 fuel pin failure under simulated loss-of-coolant-accident conditions: Creep and rupture

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-08-01 DOI:10.1016/j.nucengdes.2024.113507

Saurabh Sagar , Mohd. Kaleem Khan , Manabendra Pathak , Suparna Banerjee , Tapan Kumar Sawarn , S.K. Yadav , R.N. Singh

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Abstract

This paper presents a detailed investigation of the creep and rupture behavior of Zircaloy-4 (Zry-4) fuel claddings used in Indian Pressurized Heavy Water Reactors (IPHWR) under simulated Loss-Of-Coolant Accident (LOCA) conditions. Fuel claddings are pre-oxidized in the steam environment at 500 °C to mimic the oxygen pickup during normal reactor operation. The burst tests are then performed on these preoxidized tubes at different heating rates (55–115 K/s) and internal overpressures (15–45 bar) in the steam environment, creating LOCA-like scenario in a high burnup condition, wherein the claddings further oxidize while undergoing deformation and rupture. The burst stress correlation is developed for IPHWR claddings from the obtained burst temperature and oxygen concentration data. A burst criterion model is developed by solving available creep rate, oxidation rate, and phase transformation equations simultaneously to study the effect of various parameters on burst characteristics of the fuel cladding. The proposed burst criterion model agrees well with the present and previous experimental burst data. Also, the ballooning progression predicted from the model is validated with the present and previous experimental data. In addition, the effect of available correlations for the creep rate, phase boundary temperature, and oxidation factor on the burst characteristics has been presented.

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Zircaloy-4 燃料销在模拟冷却塔失效事故条件下的失效：蠕变和断裂

本文详细研究了印度压水重水反应堆（IPHWR）使用的锆合金-4（Zry-4）燃料包壳在模拟冷却剂损失事故（LOCA）条件下的蠕变和破裂行为。燃料包壳在 500 °C 的蒸汽环境中进行预氧化，以模拟反应堆正常运行时的氧气拾取情况。然后在蒸汽环境中以不同的加热速率（55-115 K/s）和内部超压（15-45 巴）对这些预氧化管进行爆裂试验，在高燃耗条件下创造类似 LOCA 的情景，使包壳进一步氧化，同时发生变形和破裂。根据获得的爆裂温度和氧气浓度数据，为 IPHWR 包壳建立了爆裂应力相关性。通过同时求解可用的蠕变率、氧化率和相变方程，建立了爆裂标准模型，以研究各种参数对燃料包层爆裂特性的影响。所提出的爆裂标准模型与目前和以前的实验爆裂数据非常吻合。同时，模型预测的气球化进程也与目前和之前的实验数据进行了验证。此外，还介绍了蠕变速率、相边界温度和氧化因子的可用相关性对爆裂特性的影响。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.