The study presents a procedure to artificially generate long-period ground motions using time-varying and time-invariant ARMA model approach. Since the recent destructive seismic motions of Tohoku earthquake seemed to possess the statistical features of non-stationary time series of a massive kind; a group of long-period ground motions of Tohoku earthquake is selected to develop the study. Moreover, the probabilistic risk assessment of a base-isolated NPP reactor containment building is investigated using the synthesized ground motions. The seismic fragility curves of the base-isolated NPP subjected to time-variant and time-invariant artificial ground motions are presented. The results compare the outcomes of ground motions of both types and hence ascertain the efficiency and reliability of the presented method.
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