Development of an on-line structural integrity assessment system for the primary loop pipeline in NPPs

IF 2.1 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Engineering and Design Pub Date : 2025-04-15 Epub Date: 2025-02-21 DOI:10.1016/j.nucengdes.2025.113908

Mingya Chen , Fangjie Shi , Changjin Geng , Weiwei Yu , Quanjia Peng , Wanxian Zhao , Shuiyong Wang , Guanbin Ma , Yaolei Han

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Abstract

A comprehensive online structural integrity assessment (SIA) methodology that fully accounts for the actual aging conditions and real-time transient operating parameters of primary loop pipelines in nuclear power plants remains absent in the existing literature. This paper proposes a novel online SIA approach based on thermoelectric potential (TEP) and failure assessment diagram (FAD) technologies. Initially, the online SIA process is established, and a conversion method between TEP values and impact energy is explored. The findings demonstrate that the Seebeck coefficient is highly sensitive to microstructural changes in the material, and the variation trend of TEP values closely aligns with that of impact energy. Subsequently, a systematic conversion methodology for TEP values and fracture toughness is presented. The FAD for primary loop pipelines is developed and analyzed. Sensitivity analysis of the safety margin reveals that enhancing the flow stress strength of the material or reducing the structural load is an effective strategy for improving the safety margin of the primary loop pipeline. Finally, an online SIA software, which has been successfully applied in the assessment of a nuclear power plant, is introduced. The SIA-based results confirm that the pipeline remains safe during the actual startup process.

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核电厂一次回路管道结构完整性在线评估系统的开发

现有文献中缺乏一种全面的在线结构完整性评估（SIA）方法，该方法充分考虑了核电站一次回路管道的实际老化情况和实时瞬态运行参数。本文提出了一种基于热电势（TEP）和失效评估图（FAD）技术的新型在线SIA方法。首先，建立了在线SIA流程，并探索了TEP值与冲击能之间的转换方法。结果表明，Seebeck系数对材料的微观结构变化高度敏感，TEP值的变化趋势与冲击能的变化趋势密切一致。在此基础上，提出了TEP值与断裂韧性的系统转换方法。开发并分析了一次回路管道的FAD。安全裕度敏感性分析表明，提高材料流变应力强度或减小结构载荷是提高一次环管安全裕度的有效策略。最后介绍了一种在线SIA软件，该软件已成功应用于某核电站的评价。基于sia的结果证实，在实际启动过程中，管道仍然是安全的。

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来源期刊

Nuclear Engineering and Design 工程技术-核科学技术

CiteScore

3.40

自引率

11.80%

发文量

377

审稿时长

5 months

期刊介绍： Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.