Search - Issue 32 - CFD-ANALYSIS AND PREDICTION OF THE RADIOACTIVE AEROSOLS DISTRIBUTION DURING OPERATION OF NEW SAFE CONFINEMENT

CFD-ANALYSIS AND PREDICTION OF THE RADIOACTIVE AEROSOLS DISTRIBUTION DURING OPERATION OF NEW SAFE CONFINEMENT
Cover not present CFD-ANALYSIS AND PREDICTION OF THE RADIOACTIVE AEROSOLS DISTRIBUTION DURING OPERATION OF NEW SAFE CONFINEMENT
Category: Issue 32
Publication: 32
Summary

The purpose of the work is the verification, analysis, and forecasting of the spread of radioactive aerosols (RA) under the New Safe Confinement (NSC) and Shelter object (SO) using the developed computer model. Concentrations of RA are analyzed after turning on the ventilation system and during various activities or events that may be accompanied by increased emissions of RA. SO and NSC CFD model. One of the methods for analyzing and prediction the behavior of processes within an SO is computer CFD modeling (Computational Fluid Dynamics), which makes it possible to predict the distribution of temperatures, humidity, air velocities and other values, such as concentrations of species or phases. Approach to RA modeling. Such analysis and forecasting was performed using computer CFD model of the SO and NSC. The model takes into account important physical processes, such as heat, air, humidity and RA transfer, taking place in the SO and NSC, the necessity of their analysis and forecasting, which eventually determine the safety of people and the 100-year lifetime of the NSC. The model takes into account sedimentation, accumulation and secondary dust emissions on the surfaces under the NSC, which allows obtaining distributions of surface contamination and determine the places of the highest contamination. RA in the model are presented as one of the phases of a multiphase medium, taking into account the processes of their transfer with air streams, due to diffusion, including turbulent, RA emissions from the central hall of the Shelter and their gradual subsidence under the action of gravity. The results of analysis and forecasting of the RA spread in the NSC under various conditions are presented. The conditions for the commissioning NSC, operation, dismantling of the SO (early dismantling) and removal of radioactive waste from the central hall of the SO are considered.

Keywords: radioactive aerosols, new safe confinement, surface contamination, volume concentration, 3D computer modeling.

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