According to statistics from INPO, there have been over 200 incidents of unit shutdowns worldwide since 2000 due to clogging of water intakes in nuclear power plants. These incidents have had a severe impact on the safe and stable operation of the units, resulting in significant economic losses and safety hazards. Therefore, this study focuses on a coastal nuclear power plant in China to investigate the effects of migrating disaster-causing materials on its water intake project. Firstly, a two-dimensional hydrodynamic numerical simulation method is used to establish a numerical model of the tidal current field under typical hydrological conditions at the target nuclear power plant. Based on this, the Lagrangian particle tracking method is employed to construct a mathematical model for tracking particles in the current and validate the accuracy of particle trajectories. Secondly, the simulation assesses the probability of particle entrainment under three typical hydrodynamic environments: large, medium, and small tides. Subsequently, based on the probability of suction by disaster-causing agents, we design and compare the suction probabilities of three types of intakes, and analyze the factors contributing to the differences in suction probability. The results of this study provide a scientific basis for the design of intake and discharge outlets in coastal nu-clear power plants and the prevention of invasion by floating disaster-causing agents.