Abstract: VVER-1000 units was designed and manipulated by Russian in Tianwan nuclear power station, of which radioactivity with gaseous and liquid discharges on normal operations is one of the most important index that can testify the design of NPP satisfy the relative national environmental standard’s requirements, and one of the most important content of radiation protection optimization. This paper is based on the national pressurized water reactor NPP source term framework, by analyzing Tianwan NPP relative system process flow, established mathematical models of each equipment in different circuit system when the reactor is under normal operations, adopted design and operational parameters, and calculated realistic and conservative source term respectively. The results is compared with Russian’s, and presents the changes after the new source term framework being adopted.

Key words: VVER-1000, gaseous and liquid effluents, source term