Seismic qualification of instruments and devices mounted on electrical cabinets in a nuclear power plant is performed in this study by means of the in-cabinet response spectrum (ICRS). A simple method and two rigorous methods are proposed in the EPRI NP-7146-SL guidelines for generating the ICRS. The simple method of EPRI can give unrealistic spectra that are excessively conservative in many cases. In the past, the time domain analysis (TDA) methods have been mostly used to analyze a structure. However, the TDA requires the generation of an artificial earthquake input motion compatible to the target response spectrum. The process of generating an artificial earthquake may involve a great deal of uncertainty. In addition, many time history analyses should be performed to increase the accuracy of the results. This study developed a numerical analysis program for generating the ICRS by frequency domain analysis (FDA) method. The developed program was validated by the numerical study. The ICRS calculated by FDA thoroughly matched with those obtained from TDA. This study then confirms that the method it proposes can simply and efficiently generate the ICRS compared to the time domain method.

A B S T R A C T
1. 서 론
2. 캐비닛의 지진응답해석
    2.1 지진응답의 진동수함수
    2.2 캐비닛의 응답 증폭비
    2.3 수치해석 절차
3. 해석기법의 검증
    3.1 개요
    3.2 해석모델
    3.3 입력운동
    3.4 ICRS의 비교 검토
4. 결 론
REFERENCES

• 조성국(이노스기술(주)) | Cho Sung Gook (Innose Tech Co. Ltd) Corresponding author
• 소기환(2)이노스기술(주)) | So Gihwan (Innose Tech Co. Ltd)