A simplified method for the evaluation of seismic demands on in-cabinet equipment in motor control center type cabinets in nuclear power plants
Journal
Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers, Series A
Journal Volume
40
Journal Issue
3
Pages
179-190
Date Issued
2017
Author(s)
Abstract
For numerical analysis or shaking table tests of in-cabinet equipment, in-cabinet response spectrum (ICRS) is adopted as required seismic demand. Several kinds of simplified concepts are commonly used to obtain ICRS. One of the concepts is using floor response spectrum multiplied by the in-cabinet amplification factor (AF). Other concepts generate ICRSs from FRSs (floor response spectra) by frequency or time domain analysis. However, the obtained ICRS through these methods are usually too conservative or complicated. This paper aims to provide a convenient but more precise method to evaluate ICRS for in-cabinet equipment in motor control center (MCC) type cabinets. Shaking table tests were conducted to investigate the dynamic characteristics of the MCC type cabinet. Based on the observation of the test results, global modes of the cabinet were simulated by a lumped-mass model, and local modes were simulated by a detailed finite element model of the plate at which in-cabinet equipment is anchored. The accuracy of the proposed numerical method was verified by comparing results with those from tests and other analysis methods.
Type
journal article