Relationship of Seismic Responses and Strength Indexes of Ground Motions for NPP Structures

Abstract eng:
In this study we investigate the relationship of seismic responses of ABWR type of Nuclear Power Plant structures, represented by shear force at each floor, and strength indices of simulated ground motions such as PGA, PGV, A0 (the measurement parameter for Japanese Meteorological agency (JMA) seismic intensity), and PGA*PGV. Through the study we identified basic shear indices that can indicate or predict damage level that we can expect in the future without complex calculations. For this purposes Nonlinear Direct Integration Time History Analysis are performed for the ABWR Model using simulated strong motion records, and shear force responses of linear members are correlated with strength indices of ground motions in order to obtain shear indices. We found that the regression lines, especially with PGA for all floor levels can be used for the easy assessment of seismic response and could be the basic indices for the prediction of damage level of ABWR type of NPP structures. Also we were able to examine the ABWR model using acceleration data recorded during the 2007 Niigata-ken Chuetsu-Oki earthquake, M=6.8, at the basement level of seven Kashiwazaki-Kariwa Nuclear Power Plant units.

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