Abstract: The models regarding gaseous effluent source terms from the containment building of M310 and AP1000 units were studied in this paper. The operational modes of containment cleanup System, small sweep, large purge, and other relevant systems of HPR1000 were analyzed. Combining with the operational experiences from other similar plants, the structure schemes and developing procedures of the mathematical model about the gaseous radioactive release source term from the containment building of HPR1000 were provided. The results of release source terms for three modes were estimated according to the design and experience parameters of the virtual plant. The reasons for the differences of the estimated results by different modes were analyzed. Finally the suggestions on model selection were put forward.

Key words: containment building, gaseous radioactive effluents, radioactive release source terms, mathematical model, small sweep, large purge