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首页> 外文期刊>Progress in Nuclear Energy >Understanding the seismic response of electrical equipment subjected to high-frequency ground motions
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Understanding the seismic response of electrical equipment subjected to high-frequency ground motions

机译：了解经受高频地面运动的电气设备的地震反应

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摘要

Ground motion studies in Central and Eastern United States (CEUS) show that the ground motion response spectra exceeds design spectrum of nuclear power plants in high-frequency range. To ensure safe shutdown of nuclear power plants in events where design spectrum is exceeded, the safety-related digital control systems and electrical equipment such as relays must be seismically qualified for high-frequency ground motions. Conventionally, uncoupled linear analysis of building and electrical cabinet is conducted and then seismic demands on equipment are evaluated. The conventional analysis ignores effects of various factors such as geometric nonlinearities, mass interaction between primary (building) and secondary (electrical cabinet) systems, etc. Ignoring such factors leads to unnecessarily high seismic demands on equipment. In this study, the seismic demands on equipment are evaluated by conducting both coupled and uncoupled analysis of linear primary system and linear as well as nonlinear secondary system. Various cases are analyzed where at least one mode of primary system is tuned with one mode of secondary systems. Each case is subjected to both low-frequency and high-frequency ground motions to compare the difference in response to each ground motion. The seismic demands on equipment are compared for coupled and uncoupled analysis as well as for linear and nonlinear systems. The results show reduction in seismic demands on electrical equipment for various nonlinear coupled analysis cases. The high seismic demands evaluated from linear uncoupled analysis may lead to exclusion of some electrical equipment which can be avoided by conducting coupled nonlinear analysis of primary-secondary systems and obtaining the realistic seismic demands on equipment.
机译：中部地区和东部地面行动研究（CEUS）表明，地面运动响应光谱在高频范围内超过核电厂的设计谱。为了确保超出设计频谱的事件中安全关闭，安全相关的数字控制系统和继电器等电气设备必须用于高频地面运动。传统上，对建筑物和电气柜的未耦合线性分析进行，然后评估对设备的地震要求。常规分析忽略了各种因素，例如几何非线性，主（建筑物）和次级（电气柜）和次级（电气柜）系统等的质量相互作用等因素等。忽略这种因素导致对设备不必要的高地震要求。在这项研究中，通过进行线性主系统和线性以及非线性二级系统的耦合和解耦分析来评估对设备的地震要求。分析了各种案例，其中至少一种次级系统的次级系统的至少一种模式进行调整。每种情况都经过低频和高频接地运动，以比较对每个地面运动的响应差异。比较对设备的地震要求，用于耦合和解耦分析以及线性和非线性系统。结果表明，各种非线性耦合分析案例的电气设备对地震要求的降低。从线性解耦分析评价的高地震要求可能导致一些电气设备排除，这是通过对初级二级系统进行耦合的非线性分析来避免的一些电气设备，并获得设备上的现实地震要求。

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