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http://dx.doi.org/10.5000/EESK.2010.14.3.023

Effects of the Excitation Level on the Dynamic Characteristics of Electrical Cabinets of Nuclear Power Plants  

Cho, Sung-Gook (제이스코리아 설계부)
Kim, Doo-Kie (군산대학교 토목환경공학부 토목공학)
Go, Sung-Hyuk (군산대학교 토목환경공학부 토목공학)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.14, no.3, 2010 , pp. 23-30 More about this Journal
Abstract
Seismic qualification (SQ) is required prior to the installation of safety related electrical cabinets in nuclear power plants (NPPs). Modal identification of the electrical equipment is one of the most significant steps to perform SQ, and is an essential process to construct a realistic analytical model. In this study, shaking table tests were conducted to identify a variation of the dynamic characteristics of a seismic monitoring system cabinet installed in NPPs according to the excitation level. Modal identification of the cabinet has been performed by a frequency domain decomposition method. The results of this study show that the dynamic properties of the cabinet are nonlinearly varied according to the excitation level and the specimen behaves significantly in a nonlinear manner under safe shutdown earthquake motion in Korea. The main sources of the nonlinear behavior of the specimen have been judged by friction forces and geometrical nonlinearity rather than material nonlinearity. The nonlinear variation of the dynamic characteristics of the electrical cabinet might be accepted as an important fact that should be considered during the SQ of safety related equipment.
Keywords
Seismic qualification; Electrical cabinet; Modal identification; Dynamic characteristics; Shaking table test; Nonlinear behavior;
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Times Cited By KSCI : 1  (Citation Analysis)
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