Abstract
As the main carrier of fission products, aerosols will transport in the containment and even leak into the environment during accident conditions, resulting in radioactive pollution. Thus, it is of great significance for radiation protection to study the aerosol distribution mitigation measures in containment after severe accidents. A multi-compartment lumped parameter code named ATHROC (Analysis of Thermal Hydraulic Response of Containment) was developed to analyze the thermal–hydraulic behaviors in the containment after accidents for China advance PWR. In order to satisfy the analysis of aerosol behavior in containment, an aerosol module based on the aerosol dynamic and hygroscopic models was added to the code and coupled with spray removal mechanism models. Three different types of benchmark experiments were selected for assessment of the improved code, including CVTR, LACE and CSE tests. Most of the predicted results of thermal–hydraulic responses and aerosol distribution are in realistic agreement with the experimental data. The comparative results show that the code has capabilities to accurately predict the thermal–hydraulic responses during spray activation, aerosol distribution and removal of aerosols by spray droplets. And the problems identified in the code will be further optimized in the future. Currently, the developed improved code satisfies the analysis of aerosol behavior in containment and provides a design for aerosol removal for spray system arrangement.
Published Version
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