Sub-channel analysis of the influence of the ATF cladding corrosion on thermal hydraulic behaviors

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-10-30 DOI:10.1016/j.nucengdes.2024.113668

Mingdong Kai , Jiejin Cai

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引用次数: 0

Abstract

Accident-tolerant fuel (ATF) enhances the accident tolerance of the fuels by improving its thermal properties and antioxidant radiation performance, thereby enabling the reactor to withstand severe accidents for a long time. This article applies and improves heat transfer and CHF models in the COBRA-EN by considering the impact of cladding surface corrosion on critical heat transfer between coolant and fuel rods. We conduct detailed and critical validation of the model constructed in this paper based on two benchmark experiments. We apply this model to study the thermal–hydraulic behaviors of ATFs under accident conditions. We obtain parameters such as the maximum fuel centerline temperature (MFCT), the maximum cladding surface temperature (MCT), the minimal departure from nucleate boiling ratio (MDNBR), the critical heat flux (CHF), and the average void fraction (AVF) for different ATFs. The results indicate that under most transient operating conditions, cladding corrosion delays the soaring time of the MFCT and MCT, and generally enhances CHF, with an average enhancement amplitude of over 0.15 MW/m². At the same time, due to the effect of cladding corrosion, the MDNBR of the reactor has also been improved, which mitigates the impact of the accident to some extent.

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ATF 覆层腐蚀对热液压行为影响的子通道分析

事故耐受燃料（ATF）通过改善燃料的热性能和抗氧化辐射性能来提高燃料的事故耐受性，从而使反应堆能够长期承受严重事故。本文通过考虑包壳表面腐蚀对冷却剂和燃料棒之间临界传热的影响，应用并改进了 COBRA-EN 中的传热和 CHF 模型。我们基于两个基准实验对本文构建的模型进行了详细而关键的验证。我们应用该模型研究了 ATF 在事故条件下的热液压行为。我们获得了不同 ATF 的最大燃料中心线温度 (MFCT)、最大包壳表面温度 (MCT)、最小离核沸腾比 (MDNBR)、临界热通量 (CHF) 和平均空隙率 (AVF) 等参数。结果表明，在大多数瞬态运行条件下，包层腐蚀会延迟 MFCT 和 MCT 的沸腾时间，并普遍增强 CHF，平均增强幅度超过 0.15 MW/m2。同时，由于包壳腐蚀的影响，反应堆的 MDNBR 也得到了改善，在一定程度上减轻了事故的影响。

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

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.