Abstract
The release of radioactive contaminants in nuclear facilities or facilities associated with radioactive materials could be harmful to the workers. The mechanical and natural ventilation system in the nuclear facilities can eliminate or reduce this potential risk. The purpose of this study is to analyse the correlation of natural ventilation with radon concentration in Interim Storage for Radioactive Waste in BATAN. In this study, the radon sources are not only from soil and building materials but mainly from Ra-226 radioactive waste, which was used in Brachytherapy to kill cancer cells. The simulation analysis was conducted using multi-zone airflow and contaminant transport code, CONTAM. The numerical simulation results were validated with analytical calculation and experimental measurement. The experimental measurement was performed using an electronic radon detector with real time monitoring, DURRIDGE RAD7. The results show that the change of radon concentration can be affected not only by temperature difference between indoor and outdoor but also by temperature difference between one room and the other room connected to it. The simulation- and calculation in this study are relatively consistent to the measurement results.
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