A study on the mesoscale atmospheric dispersion of radiological releases from nuclear power plant in a coastal region

A Lagrangian atmospheric dispersion model combining a three dimensional pro gnostic sea-land breeze model has been developed and applied to the analysi s of mesoscale atmospheric dispersion of radiological releases from the nuc lear power plants in mountainous coastal regions. The hydrostatic primitive equations in the terrain-following coordinate system were used in the sea- land breeze model, and a Markov chain process and a kernel density estimato r were used in the Lagrangian particle dispersion model. In this study, the mesoscale atmospheric circulation and particle dispersion simulations arou nd the Wolsung nuclear power site located on the east coastline of Korea we re carried out for two synoptic weather conditions on a clear day in summer by using the developed models. The simulated results showed that the atmos pheric dispersions were affected by wind directions of sea breeze and land breeze according to synoptic weather conditions. And the simulated results have very good agreement with the observations.