Recent earthquake events arising all over the world, cause serious damages to material/ human resources every year. South Korea, categorized to be relatively safe from earthquakes, recently became subject to frequent seismic events, which made it essential to prepare for damages caused by such events. Failure of hydraulic structures, such as dams, can cause serious damages to resources in the lower reaches of a river. In this study, as a counterproposal for deterministic safety assessment for seismic events on dams, which cannot take into account the uncertainty of various parameters, a method is introduced which constructs a safety chart by creating an artificial seismic wave considering uncertainties of seismic sources, propagation paths and site effects.