The SMART (System-integrated Modular Advanced ReacTor) is an integral-type small modular reactor developed by KAERI (Korea Atomic Energy Research Institute). This paper discusses the feasibility and applicability of a 3D-based equivalent model using dynamic condensation method for seismic analysis of a SMART control rod drive mechanism. The equivalent model is utilized for complicated seismic analysis during the design of the SMART. While the 1D-based beam–mass equivalent model is widely used in the nuclear industry for its calculation efficiency, the 3D-based equivalent model is suggested for the seismic analysis of SMART to enhance the analysis accuracy of the 1D-based equivalent model while maintaining its analysis efficiency. To verify the suggested model, acceleration response spectra from seismic analysis based on the 3D-based equivalent model are compared to those from the 1D-based beam–mass equivalent model and experiments. The accuracy and efficiency of the dynamic condensation method are investigated by comparison to analysis results based on the conventional modeling methodology used for seismic analysis.

SMART（System-integrated Modular Advanced ReacTor）是由KAERI（韩国原子能研究院）开发的一体式小型模块化反应堆。本文讨论了基于 3D 的等效模型使用动态凝聚法对 SMART 控制棒驱动机构进行地震分析的可行性和适用性。在SMART设计过程中，等效模型被用于复杂的地震分析。虽然基于 1D 的梁质量等效模型因其计算效率而在核工业中被广泛使用，但基于 3D 的等效模型被建议用于 SMART 的地震分析，以提高基于 1D 的等效模型的分析精度，同时保持其分析效率。要验证建议的模型，将基于 3D 等效模型的地震分析的加速度响应谱与基于 1D 的梁质量等效模型和实验的加速度响应谱进行比较。通过与基于用于地震分析的传统建模方法的分析结果进行比较，研究了动态凝聚法的准确性和效率。