Probabilistic Safety Assessment (PSA) is a methodology used to quantitatively evaluate the risk associated with nuclear power plant accidents. Among its levels, Level 3 PSA assesses the environmental and public health impacts resulting from the release of radioactive materials. In this context, the emergency response model serves as a key input that determines the timing, duration, and routing of emergency response, thereby directly influencing dose assessment results. Therefore, the emergency response model should be constructed to reflect realistic accident conditions and site-specific characteristics. Hazards considered in nuclear power plant safety assessments are generally classified into internal hazards and external hazards. Internal hazards include internal events, internal flooding, and internal fires, while external hazards include seismic events, high winds, and external flooding [1]. Previous studies have primarily focused on Level 3 PSA analyses based on internal hazards, whereas the impact of external hazards has been mainly investigated within the framework of Level 1 and Level 2 PSA. As a result, in Level 3 PSA, event-specific methodologies that adequately reflect the characteristics of external hazards have not yet been fully established, and some analyses are conducted based on simplified assumptions [2]. Therefore, this study selects seismic events and high wind events, which are among the most frequent external hazards in Korea, as representative cases and develops an emergency response model optimized for these external events. In seismic and high wind PSA, risk analyses are typically performed considering the intensity and magnitude of the hazards, and the resulting structural responses are evaluated to determine their impact on plant systems [3, 4]. In this study, based on a representative site in Korea, the vulnerability of bridges and road networks under varying hazard intensities is analyzed and incorporated into the emergency response model. The resulting parameters are then implemented in MACCS [5] to perform dose assessments. Through this approach, infrastructure vulnerability and emergency response characteristics associated with external hazards can be integrated into the analysis. This study enables consequence assessments that reflect event-specific emergency response models for both internal and external hazards, thereby improving the realism and applicability of Level 3 PSA results.