Analysis of the dynamics of distribution of fission products and radionuclides under the containment of NPP-2006

The term “source” is defined in the article on the basis of international terminology as a value representing the physical and chemical form, as well as taking into account the time of release of fission products and other aerosols from core materials and concrete into the atmosphere of the primary containment or into the suppression pool. Chemical forms of fission products and radionuclides that can be released from the cores of modern light water reactors are considered. Modeling of the dynamics of the spread of the source of radioactive substances was simulated using the COMSOL Multiphysics software package using the LES method with the Smagorinsky subgrid model. Physically consistent results were obtained, indicating that the model functions correctly. A mechanism was developed to analyze the propagation of multicomponent flows under the containment of NPP-2006. The work will help to clarify the data needed to improve the model created using the COMSOL Multiphysics software package for simulating the spatial distribution of multicomponent gas flows and radioactive aerosols under the сontainment of NPP-2006 during accidents involving the release of radioactive substances and fission products.