응답스펙트럼해석법을 이용한 배전반의 내진건전성 해석

In this study, a response spectrum analysis of an electric distributing board (EDB) was conducted toinvestigate seismic integrity in the design stage. For the seismic analysis, the required response spectra of asafe shutdown earthquake with 2% damping (RRS/SSE-2%) specified in GR-63-CORE Zone 4 was used as theground spectral acceleration input. A finite element method modal analysis of the EDB was also performed toexamine the occurrence of resonance within the frequency range of the earthquake response spectrum. Furthermore, static stress caused by deadweight was analyzed. The resultant total maximum stress of the EDBstructure was calculated by adding the maximum stresses from both seismic and static loads using the squareroot of the sum of the squares (SRSS) method. Finally, the structural safety of the EDB was investigated bycomparing the resultant total maximum stress with the allowable stress.