Abstract: In order for the design of nuclear power emission facilities, the mixing uniformity which met the requirements of ISO 2889—1975 and “2∶8” principle was studied in this paper, by the method of modeling calculation in accordance with ISO 2889—2010 standards. The results show that only the basic flow characteristics as flow angel and velocity meet the requirements, but the mixing uniformity of emission representative radioiodine nuclide assessment in radioactive gas and aerosol could not meet the requirements. In order to ensure the reliability of the study, the results are verified by both simulation program and experiment. The results show that the Graphene calculation method used in this paper is in good agreement with compared program. Grapheneprogram has better results than compared program by comparing with the experimental results. The research methods and results of this paper can provide an important reference for the safe emission control of nuclear power and the implementation of relevant regulations.

Key words: radioactive airborne, emissions, ISO 2889—2010, emission control, mixed characteristics, uniformity