Simulation Research On Atmospheric Dispersion Of Radioactive Materials

Simulation on the process of radioactive material atmospheric dispersion is conducted in this paper by the operation environment ASCA. Research on the process of radioactive material atmospheric dispersion is an important part of the dose evaluation system of the nuclear power plant, and it is very important to the accident emergency decision of the nuclear power plant.Some basic theories and models of atmospheric dispersion are introduced at the beginning of the paper, and their application condition is discussed too. Simulation on the process of radioactive material atmospheric dispersion under nuclear accident is conducted on the segment diffusion model. The influence factors such as elevation, dry deposition, wet deposition and decay of radioactive nuclide are considered during simulation, and program compiling and debugging are done according to the characteristic of the operation environment ASCA, then the simulation on the process of radioactive material atmospheric dispersion is completed in the end.The results show that the process of radioactive material atmospheric dispersion under nuclear accident can be truly simulated through the segment dispersion model constructed on the operation environment, which can predict the tendency of atmospheric dispersion and the distribution of concentration under the condition of nuclear accident.