Abstract: The advantages and disadvantages of pressurized storage decay method and retention bed adsorption method were compared to ensure its gaseous radioactive effluents generated in an isotope production line meet relevant national emission standards, based on released source term and gas flow. Referring to process designs of radioactive waste gas treatment systems in domestic nuclear power plants, a combined process of “alkali washing+freez dehumidification+adsorption drying+activated carbon retention” was proposed. The process flow and parameter design of main equipment are introduced in detail, and the loading amount of activated carbon in the retention bed was optimized and calculated repeatedly. The design of the scheme meets the requirements of the isotope production line and achieves a good comprehensive balance in terms of safety, economy and practicability. The function, system flow, system configuration and layout scheme of the designed waste gas treatment device are described with an overall design scheme, furthermore, the experimental results of some corresponding tests show that the device design meets the expected requirements.

Key words: radioactive waste gas, activated carbon retention, treatment, process design