ABSTRACT This study investigates the fragility assessment of the electrical cabinet facility, a steel structural form that exhibits behavior and response patterns distinct from the normal structure. To evaluate this cause, a set of 40 ground motions was spectrally matched to the design response spectra (RG 1.60) and incremental dynamic analysis was considered. The two design guidelines including earthquake loss estimation methodology (HAZUS) and Nuclear Regulatory Commission (NUREG) were followed. Using the response statistics with the consideration of different damage states, the corresponding fragility curves were developed. For validation, the developed fragility functions were found to be consistent with the fragilities available in the HAZUS and NUREG. Subsequently, the seismic capacity for the group of cabinets was evaluated, which manifests a great influence on the probabilistic seismic risk assessment of the facility. The main thrust of this study was the significant alteration in the seismic capacity due to the grouping effects that account for 28% and 50% reduction in the probability of failure for two and three cabinets together. This effect can be considered as one of the important aspects that can induce a considerable impact on the seismic capacity evaluation and performance of the NPP electrical components.

中文翻译：

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考虑分组效应的核电厂电气柜设施抗震能力评价

摘要 本研究调查了电气柜设施的脆弱性评估，这是一种钢结构形式，表现出与正常结构不同的行为和响应模式。为了评估这个原因，一组 40 个地面运动在光谱上与设计响应谱 (RG 1.60) 相匹配，并考虑了增量动力分析。遵循了包括地震损失估计方法 (HAZUS) 和核管理委员会 (NUREG) 在内的两个设计指南。使用考虑不同损伤状态的响应统计，开发了相应的脆性曲线。为了验证，发现开发的脆性函数与 HAZUS 和 NUREG 中可用的脆性一致。随后，评估了机柜组的抗震能力，这对设施的概率地震风险评估有很大影响。这项研究的主要重点是由于分组效应导致两个和三个机柜一起发生故障的概率降低 28% 和 50%，从而显着改变了抗震能力。这种效应可以被认为是对核电厂电气元件的抗震能力评估和性能产生相当大影响的重要方面之一。