Abstract This study is to evaluate the seismic capacity of the fire-damaged cabinet facility in a nuclear power plant (NPP). A prototype of an electrical cabinet is modeled using OpenSees for the numerical simulation. To capture the nonlinear behavior of the cabinet, the constitutive law of the material model under the fire environment is considered. The experimental record from the impact hammer test is extracted trough the frequency-domain decomposition (FDD) method, which is used to verify the effectiveness of the numerical model through modal assurance criteria (MAC). Assuming different temperatures, the nonlinear time history analysis is conducted using a set of fifty earthquakes and the seismic outputs are investigated by the fragility analysis. To get a threshold of intensity measure, the Monte Carlo Simulation (MCS) is adopted for uncertainty reduction purposes. Finally, a capacity estimation model has been proposed through the investigation, which will be helpful for the engineer or NPP operator to evaluate the fire-damaged cabinet strength under seismic excitation. This capacity model is presented in terms of the High Confidence of Low Probability of Failure (HCLPF) point. The results are validated by the proper judgment and can be used to analyze the influences of fire on the electrical cabinet.

中文翻译：

---

核电厂火灾损坏机柜设施抗震能力评价

摘要 本研究旨在评估核电厂（NPP）火灾损坏的机柜设施的抗震能力。使用 OpenSees 对电气柜的原型进行建模以进行数值模拟。为了捕捉机柜的非线性行为，考虑了火灾环境下材料模型的本构规律。通过频域分解（FDD）方法提取冲击锤试验的实验记录，用于通过模态保证准则（MAC）验证数值模型的有效性。假设不同的温度，非线性时程分析是使用一组 50 次地震进行的，并通过脆性分析研究地震输出。为了获得强度测量的阈值，蒙特卡罗模拟 (MCS) 用于降低不确定性。最后，通过调查提出了容量估计模型，这将有助于工程师或核电厂运营商评估地震激发下的火灾损坏机柜强度。此容量模型以低故障概率 (HCLPF) 点的高置信度表示。结果通过正确的判断得到验证，可用于分析火灾对电气柜的影响。此容量模型以低故障概率 (HCLPF) 点的高置信度表示。结果通过正确的判断得到验证，可用于分析火灾对电气柜的影响。此容量模型以低故障概率 (HCLPF) 点的高置信度表示。结果通过正确的判断得到验证，可用于分析火灾对电气柜的影响。