Concrete buildings in nuclear power plant (NPP) are often irregularly shaped box frame structures with reinforced concrete (RC) shear walls, according to equipment layout. Generally, these structures are designed in accordance with the NPP seismic design technical provision. However, the applicability of the provision to complex box frame structures has not been realized. In this study, the impact of the RC shear walls with irregularity on the seismic performance of NPP buildings is evaluated using a finite element model (FEM). Moreover, a correction method to apply the provision to those buildings is confirmed by comparing the FEM with the provision.
