Based on the PWR nuclear power plant, the sources of radioactive noble gas from core fission and the model of the gas movement in the waste gas system are analyzed, focusing on the delay state analysis of the isotopes of Kr and Xe creeping through the activated carbon. This paper proposes a design method of delay bed mass calculation based on system flow rate, dynamic adsorption coefficient and the holdup time back calculated from the annual radioactive release of waste gas system. Finally the section and dimensions of delay beds are determined based on the flow velocity recommended in ANSI/ANS 55.4. This calculation method lays the theoretical foundation of the waste gas system design and the dimension design for activated carbon delay bed.

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