Probabilistic assessment of switchyard-centered LOOP event frequency and duration in an NPP

IF 1.6 Q2 ENGINEERING, MULTIDISCIPLINARY International Journal of System Assurance Engineering and Management Pub Date : 2024-07-17 DOI:10.1007/s13198-024-02416-6
Rabah Benabid, Pierre Henneaux, Pierre-Etienne Labeau
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Abstract

The occurrence of a Loss Of Offsite Power (LOOP) event can be a major threat to nuclear safety due to the dependence of auxiliary systems on electrical energy. Probabilistic safety assessments of nuclear power plants require, thus, estimates of the frequencies and durations of such LOOP events. These estimates are usually based on past statistical data, which is not always relevant. Model-based approaches are thus needed. This paper proposes an analytical method to estimate the frequency and duration of switchyard-centered LOOP events, which constitute one of the four main categories of LOOP events. The proposed method is mainly based on the identification of active minimal cut sets, considering the behavior of circuit breakers against faults according to their coordination and selectivity. Adapted versions of the Risk Reduction Worth and Fussel–Vesely importance factors are proposed to evaluate the impact of components on the switchyard-centered LOOP event frequency. Furthermore, uncertainty analysis is developed and performed. Various generic plant connection schemes are used for application. Results demonstrate the applicability of the methodology to estimate the frequency and duration of switchyard-centered LOOP events, and to identify optimal ways to reduce the risk by modifying the switchyard configuration.

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对核电厂以开关站为中心的 LOOP 事件频率和持续时间进行概率评估
由于辅助系统对电能的依赖,场外失电(LOOP)事件的发生会对核安全造成重大威胁。因此,核电厂的概率安全评估需要对此类 LOOP 事件的频率和持续时间进行估计。这些估算通常基于过去的统计数据,而这些数据并不总是相关的。因此需要基于模型的方法。本文提出了一种估算以开关站为中心的 LOOP 事件频率和持续时间的分析方法,该方法构成了 LOOP 事件的四大类别之一。所提出的方法主要基于主动最小断路器组的识别,根据断路器的协调性和选择性考虑断路器针对故障的行为。提出了风险降低值和 Fussel-Vesely 重要性因子的改编版,以评估各组件对以开关站为中心的 LOOP 事件频率的影响。此外,还开发并执行了不确定性分析。应用中使用了各种通用的电站连接方案。结果表明,该方法适用于估算以开关站为中心的 LOOP 事件的频率和持续时间,以及通过修改开关站配置来确定降低风险的最佳方法。
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来源期刊
CiteScore
4.30
自引率
10.00%
发文量
252
期刊介绍: This Journal is established with a view to cater to increased awareness for high quality research in the seamless integration of heterogeneous technologies to formulate bankable solutions to the emergent complex engineering problems. Assurance engineering could be thought of as relating to the provision of higher confidence in the reliable and secure implementation of a system’s critical characteristic features through the espousal of a holistic approach by using a wide variety of cross disciplinary tools and techniques. Successful realization of sustainable and dependable products, systems and services involves an extensive adoption of Reliability, Quality, Safety and Risk related procedures for achieving high assurancelevels of performance; also pivotal are the management issues related to risk and uncertainty that govern the practical constraints encountered in their deployment. It is our intention to provide a platform for the modeling and analysis of large engineering systems, among the other aforementioned allied goals of systems assurance engineering, leading to the enforcement of performance enhancement measures. Achieving a fine balance between theory and practice is the primary focus. The Journal only publishes high quality papers that have passed the rigorous peer review procedure of an archival scientific Journal. The aim is an increasing number of submissions, wide circulation and a high impact factor.
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