## 5 Conclusions
The amplification ratios (R\({}_{\text{Avg}}\), R\({}_{\text{Peak}}\), R\({}_{\text{ZPA}}\)), defined using these three approaches, were calculated accordingly. The results indicate that with increasing input seismic motion, both R\({}_{\text{Avg}}\) and R\({}_{\text{Peak}}\) generally showed a linear increase with respect to the height of the electrical cabinet model, whereas R\({}_{\text{ZPA}}\) exhibited nonlinear variation with height at EQ3. Among the three methods, R\({}_{\text{ZPA}}\) was consistently the largest, while R\({}_{\text{Avg}}\) and R\({}_{\text{Peak}}\) presented generally similar results with respect to height. In the horizontal directions, R\({}_{\text{Avg}}\) in the resonant frequency range (10-20 Hz) was greater at EQ1 and EQ2. In contrast, R\({}_{\text{Peak}}\) was greater than R\({}_{\text{Avg}}\) in the high-frequency range (20-50 Hz). These observations suggest that under relatively low seismic motion, where no anchorage damage occurs, the acceleration response in the resonant frequency range tends to be linearly and uniformly amplified. However, as the seismic motion increases, the resulting anchorage damage, including rocking and impact, contributes significantly to the amplification observed in the high-frequency range. The comparison of the acceleration response amplification between the experimental and numerical results confirmed that the numerical model, assuming fully fixed boundary conditions with constraints on all degrees of freedom, does not adequately reflect the actual seismic behavior. This limitation may result in the nonlinear characteristics of the anchorage being neglected, potentially leading to an overestimation of seismic performance. Significant differences in behavior were identified due to the superposition of global modes and local modes induced by impact. Unlike the general case where acceleration response amplification increases linearly with height, the amplification in the electrical cabinet model was found to be nonlinear and could reach its maximum at any location. Furthermore, this nonlinear amplification was observed to contribute to the increase in the ICRS, particularly in the high-frequency range, potentially causing not only structural problems in the cabinet but also inducing alternative failure modes and functional issues in internal equipment. If only relatively low seismic motions are considered in the numerical approach, actual seismic behaviors, such as rocking and impact caused by local anchorage response, may be overlooked. Since such impulsive characteristics have a greater influence on high-frequency responses, especially in the vertical direction, vertical response behavior must also be addressed in numerical studies and seismic evaluations. Consequently, when the numerical model is unable to adequately account for the superposition of global and local modes of the electrical cabinet, or the interaction effects with the concrete foundation caused by the nonlinear behavior of the anchorage--or when damage from large seismic loads must be evaluated--evaluating the cabinet's behavior through experimental methods is appropriate. The findings from this study on the seismic behavior characteristics of the electrical cabinet model are expected to serve as foundational data for evaluating the seismic performance, anchorage configurations, and installation conditions of electrical equipment installed in NPPs. Conceptualization, D.-W.Y., B.-G.J. and S.-W.K. ; Field survey, D.-W.Y., B.-G.J., S.-W.K., D.H. and H.-P.L. ; Experimental test, D.-W.Y., B.-G.J. and S.-W.K. ; Methodology, D.-W.Y. and B.-G.J. ; Numerical analysis, D.-W.Y. and B.-G.J. ; Validation, D.-W.Y. and B.-G.J. ; Visualization, D.-W.Y. ; Investigation, D.-W.Y. and B.-G.J. ; Writing--original draft preparation, D.-W.Y. ; Writing--review and editing, D.-W.Y., B.-G.J. and S.-W.K. ; Project administration, B.-G.J. ; Funding acquisition, H.-P.L. All authors have read and agreed to the published version of the manuscript.