Seismic analyses of i-SMR CV supports employing a component mode synthesis technique

To ensure the safety of next-generation reactors, innovative design concepts and subsequent extensive engineering analyses are essential. However, recurrent modifications of major structures, systems and components require substantial resources for repeated evaluations. This study proposes an efficient component mode synthesis (CMS) technique tailored for a developing small modular reactor. First, the baseline seismic parameters of critical locations were calculated through conventional modal analysis (MA), response spectrum analysis and time history analysis (THA) corresponding to their original configuration. Secondly, benchmark MA and THA were performed using both Craig-Bampton and Hintz-Herting CMS techniques. Comparison with the reference analysis outcomes showed the superior suitability of the latter. Finally, four design alternatives were developed and analyzed using the Hintz-Herting CMS technique to determine the optimal structural arrangement of supports. The results demonstrated that the proposed technique significantly reduced computational time by more than 80 % while preserving dynamic fidelity.