[en] In general, SPRA (Seismic Probabilistic Risk Assessment) has been applied to assess the seismic performance of the operating nuclear power plant. Also, Aging deterioration is occurring gradually at the nuclear power facilities as operation period of nuclear power plant is increased. However, when the seismic performance is assessed for nuclear power facilities, SPRA has not been considered the aging deterioration enough. Therefore, seismic walkdown is performed to investigate the aging deteriorations intended for the operating nuclear power facilities and seismic fragility analysis of nuclear power facilities is carried out considering the aging deterioration in this study