This paper summarizes our seismic analysis of the soil structure interaction (SSI) responses of N-reactor facility. In the SSI analysis, CLASSI computer codes were used to calculate SSI responses of the structures and to generate the input motions for the nonlinear reactor core analysis. In addition, the responses were compared to the responses from the SASSI analysis under review. The impact of the foundation modeling techniques and the effect of soil stiffness variations on SSI response were also investigated.

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