The standard design of CAP1000 Feedwater system configures 3×33.3% main feedwater pumps. In the operational transient “loss of one main feedwater pump”, the plant will ramp down the turbine load to 70% automatically and remain load balance by the two operational pumps.

The owners of CAP1000 submitted a claim for the fourth main feedwater pump so that the plant can maintain 100% turbine load throughout the transient “loss of one main feedwater pump”. The owners insisted that this design modification avoids partial-load operation and enhance the economic benefit.

In this paper, the trip risk of the addition of the fourth main feedwater pump is evaluated base on the transient analysis of “loss of one main feedwater pump”. And the solution of the fourth pump actuation plan which farthest decrease the reactor trip probability is presented. It is the most balanced plan between economy and feasibility.

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