The atmospheric dispersion modeling of radionuclides is used to obtain responses to emergencies by estimating radiation effects, associated with the atmospheric release of radioactive materials. Nowadays, almost all software used for these purposes, is based on the Gaussian model, which provides fast and conservative means that consider regions free of obstructions and simple weather conditions. However, when it comes to calculate radiological impacts from radionuclide transport to recover the affected area in complex regions close to the event, considering the physical or physico-chemical phenomena of the flow, the radioactive-cloud spreading time, the concentration and effective dose levels, and both time and environmental impact on the reached area, we need to use more robust tools to assist us in decision making. Hence, this work aims to address the use of computational fluid dynamics as a differentiated and complementary tool to support decisions related to nuclear emergencies, involving the atmospheric dispersion of radionuclides, and to analyze a possible underground nuclear explosion, based on the calculation of radioxenon surface flow regarding yields, detonation depths and distinct permeabilities.
The objective of the work is to show the application of CFD, as a differentiated and complementary tool for data analysis and characterization of relevant events to the Treaty. Being able to contribute in the exchange of knowledge between CTBTO and the scientific community.