An improved HRA method based on LOOP accident for multi-unit by SPAR-H combined with system dynamics

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

Nuclear Engineering and Design Pub Date : 2025-05-08 DOI:10.1016/j.nucengdes.2025.114119

Zecong Li, Wanxin Feng, Bingbing Wang, Yu Yu

{"title":"An improved HRA method based on LOOP accident for multi-unit by SPAR-H combined with system dynamics","authors":"Zecong Li, Wanxin Feng, Bingbing Wang, Yu Yu","doi":"10.1016/j.nucengdes.2025.114119","DOIUrl":null,"url":null,"abstract":"<div><div>In multi-unit plant sites, existing methods and experiences have identified new issues faced by multi-unit probabilistic safety assessment (PSA), such as the correlation between performance shaping factors (PSFs), the complexity of diagnosis in multi-unit accidents, and the dynamic nature of personnel and environmental states changing over time during human reliability analysis (HRA). Existing methods cannot fully describe the above problems. This paper combines HCR to improve the SPAR-H method, proposes a multi-unit HRA process based on system dynamics (SD), and constructs a dynamic multi-unit HRA model. This model considers the complexity of multi-unit accident diagnosis and establishes the relationship between procedures and time in SPAR-H combined with HCR. SD method is used to represent the relationship between PSFs in SPAR-H, and piecewise functions are used to represent the dynamic changes in personnel and environmental states. In addition, compensation functions for personnel work efficiency using PSFs is added to the model. In this paper, the call of the fifth diesel engine after the emergency diesel engines of both units failed in the loss of off-site power accident is used as a case to demonstrate the feasibility of the proposed model. Based on the calculation results, it can be found that diagnostic errors are the main contributing factor to personnel failure in multi-unit accidents, and the completeness of procedures has a significant impact on personnel errors. The complexity of tasks and the time required for personnel diagnosis can be reduced by supplementing and improving the procedures for multi-unit accidents, thereby reducing the human error probability (HEP) after accidents.</div></div>","PeriodicalId":19170,"journal":{"name":"Nuclear Engineering and Design","volume":"439 ","pages":"Article 114119"},"PeriodicalIF":1.9000,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nuclear Engineering and Design","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0029549325002961","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

In multi-unit plant sites, existing methods and experiences have identified new issues faced by multi-unit probabilistic safety assessment (PSA), such as the correlation between performance shaping factors (PSFs), the complexity of diagnosis in multi-unit accidents, and the dynamic nature of personnel and environmental states changing over time during human reliability analysis (HRA). Existing methods cannot fully describe the above problems. This paper combines HCR to improve the SPAR-H method, proposes a multi-unit HRA process based on system dynamics (SD), and constructs a dynamic multi-unit HRA model. This model considers the complexity of multi-unit accident diagnosis and establishes the relationship between procedures and time in SPAR-H combined with HCR. SD method is used to represent the relationship between PSFs in SPAR-H, and piecewise functions are used to represent the dynamic changes in personnel and environmental states. In addition, compensation functions for personnel work efficiency using PSFs is added to the model. In this paper, the call of the fifth diesel engine after the emergency diesel engines of both units failed in the loss of off-site power accident is used as a case to demonstrate the feasibility of the proposed model. Based on the calculation results, it can be found that diagnostic errors are the main contributing factor to personnel failure in multi-unit accidents, and the completeness of procedures has a significant impact on personnel errors. The complexity of tasks and the time required for personnel diagnosis can be reduced by supplementing and improving the procedures for multi-unit accidents, thereby reducing the human error probability (HEP) after accidents.

查看原文本刊更多论文

SPAR-H结合系统动力学的基于LOOP事故的多机组改进HRA方法

在多单元厂区，现有的方法和经验已经确定了多单元概率安全评估（PSA）面临的新问题，如性能形成因素（psf）之间的相关性，多单元事故诊断的复杂性，以及在人的可靠性分析（HRA）过程中人员和环境状态随时间变化的动态性质。现有的方法不能完全描述上述问题。本文结合HCR对SPAR-H方法进行改进，提出了一种基于系统动力学（SD）的多单元HRA过程，构建了动态多单元HRA模型。该模型考虑了多单元事故诊断的复杂性，并结合HCR建立了SPAR-H中程序与时间的关系。SPAR-H采用SD法表示psf之间的关系，采用分段函数表示人员和环境状态的动态变化。此外，在模型中加入了基于psf的人员工作效率补偿函数。本文以失电事故中两台机组应急柴油机故障后的第五台柴油机呼叫为例，验证了所提模型的可行性。根据计算结果可以发现，在多单元事故中，诊断错误是造成人员失误的主要因素，程序的完备性对人员失误有显著影响。通过对多单元事故程序的补充和完善，可以减少人员诊断任务的复杂性和所需的时间，从而降低事故发生后的人为错误概率（HEP）。

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

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.