Background: The calculation model of airborne radioactive source term in Nuclear Power Plants is one of the key points of safety review. However

in most safety analysis reports

a general simplified model of airborne radioactive source terms has been used

which is not applicable for all cases. Purpose: The aim is to complete the review calculations quickly and accurately. Methods: The model was based on the physical diffusion mechanism of radionuclides and their diffusion behavior in different spaces. Results: We proposed three models which could be respectively used for airborne radioactive source terms in reactor building

fuel element building and auxiliary building. Meanwhile

the key points in review of airborne radioactive source terms were put forward. Conclusion: Three models were proposed and their corresponding review key points will play a significant role in review calculations.