Abstract
Abstract Numerical simulations of radioactive aerosols dispersion were conducted to determine the potential radiation hazard on occupants due to radioactive aerosols emitted from the workbench in a large nuclear plant industrial workshop with a stratified air conditioning system. Different air organization schemes were evaluated based on the position of the workbench under the initial, mainstream and end locations of the jet stream. The two air distributions of ”unilateral nozzle air supply” (UNAS) and ”bilateral nozzle air supply” (BNAS) were considered based on experimental measurements. Results show a high removal efficiency of radioactive aerosols when the pollution source was in the main jet stream under ”BNAS”. Both air distributions worked well when the pollution source from the workbench was in the initial and end section of the jet air stream. In addition, increasing the local exhaust velocity was an effective solution to remove the radioactive aerosols. The maximum effective dose rate calculated for workers’ exposure to radioactive aerosols was 14.39mSv y−1 when the local exhaust system was operating normally in the work area, in the main jet stream under “UNAS”. Therefore, the average effective annual dose was under the International Commission on Radiological Protection (ICRP)’s recommended limit of 20.0mSv y−1.
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