Flowmaster in the Application of Auxiliary Feedwater System´s Transient Operation

For the configuration of the auxiliary feedwater system of Daya Bay Second-generation Nuclear Power Station, this paper establishes the auxiliary feedwater system by using of one-dimensional fluid analysis software Flowmaster. By carrying out transient analysis, we get the system simulation results of the three cases of rapid closure of valve, slow closure of valve, an addition accumulator added upstream of the rapidly closing valve. To compare with the results of different configuration, this paper put forward that slow closure of valve or an addition accumulator added upstream of the rapidly closing valve can suppress flow fluctuation and water hammer effect. Thus, more reasonable solutions for the safe operation of the system are provided.