NUMERICAL STUDY ON TRANSPORT AND DEPOSITION CHARACTERISTICS OF RADIOACTIVE MATERIALS UNDER SEVERE ACCIDENT BASED ON MESOSCALE EULERIAN COUPLING MODEL

Abstract

Accidental release of radioactive aerosols is a high possibility under severe nuclear accident. The aerosols may be transported and diffused to downwind of the nuclear site, and simultaneously settle on the ground. The movement of radioactive aerosols in the atmosphere would lead to severe radioactive contamination on the ground, and further polluting the environment and harming human health. Therefore, it is reasonable to make numerical study on the transport and deposition characteristics of radioactive aerosols in the atmosphere. In the present work, estimation method based on Mesoscale Eulerian coupling model was established. Meteorological condition and source term data of Chernobyl accident, aerosol concentration and deposition distribution after Chernobyl accident were simulated. The present study made it possible to apply mesoscale model to severe nuclear accident research, and can be helpful for the aftermath evaluation of severe nuclear accident in the future.