Internal stress analysis of irradiated graphite cores in a gas-cooled microreactor

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-10-15 DOI:10.1016/j.nucengdes.2024.113647

Tianbao Lan , Tianyou Feng , Feng Sheng , Wei Tan

{"title":"Internal stress analysis of irradiated graphite cores in a gas-cooled microreactor","authors":"Tianbao Lan , Tianyou Feng , Feng Sheng , Wei Tan","doi":"10.1016/j.nucengdes.2024.113647","DOIUrl":null,"url":null,"abstract":"<div><div>The structural integrity of core graphite under high-temperature irradiation conditions is crucial for the safe operation of the reactor. This paper presents a simulation of the hexagonal core graphite structure, developed using the UMAT program. Design factors, including irradiation, high temperature, dimensional strain, and creep strain, are analyzed separately through the control variable method. The results indicate a positive correlation between the magnitude of the irradiation field gradient and the resulting stress effects. Stress concentration within the temperature field is observed to occur near the inner side of the hexagonal prism. Among the four types of graphite examined, PCIB demonstrates the least stress and deformation, making it more suitable for specific applications. The selection of graphite should consider the particular service period requirements. Choosing a graphite material that exhibits minimal shrinkage and a high turnaround dose is advisable. The primary creep parameter is negligible when compared to the secondary creep parameter; selecting graphite with a larger secondary creep parameter enhances reactor safety. The findings of this study provide a solid foundation for the design of a graphite core and offer recommendations for graphite candidates in the development of microreactors in China.</div></div>","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":null,"pages":null},"PeriodicalIF":16.4000,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0029549324007477","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

The structural integrity of core graphite under high-temperature irradiation conditions is crucial for the safe operation of the reactor. This paper presents a simulation of the hexagonal core graphite structure, developed using the UMAT program. Design factors, including irradiation, high temperature, dimensional strain, and creep strain, are analyzed separately through the control variable method. The results indicate a positive correlation between the magnitude of the irradiation field gradient and the resulting stress effects. Stress concentration within the temperature field is observed to occur near the inner side of the hexagonal prism. Among the four types of graphite examined, PCIB demonstrates the least stress and deformation, making it more suitable for specific applications. The selection of graphite should consider the particular service period requirements. Choosing a graphite material that exhibits minimal shrinkage and a high turnaround dose is advisable. The primary creep parameter is negligible when compared to the secondary creep parameter; selecting graphite with a larger secondary creep parameter enhances reactor safety. The findings of this study provide a solid foundation for the design of a graphite core and offer recommendations for graphite candidates in the development of microreactors in China.

查看原文本刊更多论文

气冷式微反应器中辐照石墨芯的内应力分析

高温辐照条件下堆芯石墨的结构完整性对反应堆的安全运行至关重要。本文介绍了利用 UMAT 程序开发的六边形堆芯石墨结构模拟。通过控制变量法分别分析了辐照、高温、尺寸应变和蠕变应变等设计因素。结果表明，辐照场梯度的大小与所产生的应力效应呈正相关。据观察，温度场中的应力集中发生在六棱柱内侧附近。在所研究的四种石墨中，PCIB 的应力和变形最小，因此更适合特定应用。选择石墨时应考虑特定的使用期限要求。最好选择收缩率最小、周转率高的石墨材料。与二次蠕变参数相比，一次蠕变参数可忽略不计；选择二次蠕变参数较大的石墨可提高反应堆的安全性。本研究的结果为石墨堆芯的设计奠定了坚实的基础，并为中国开发微反应器的石墨候选材料提供了建议。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.