Taking the motor-driven feed-water pump(MFP) on conventional island of Fujian Ningde Nuclear Power Plant as the object of study

a model of feed-water flow process from the outlet of deaerator to the inlet of steam generator has been established by using Flowmaster software

the deficit of feed-water delivered to the steam generator being calculated

and the sensitive analysis of the main affecting factors upon the deficit of feed-water being carried out.Results of analysis show that the deficit of feed-water delivered to the steam generator during transient process of switching the MFP over in the first-phase project of Ningde Nuclear Power Plant can satisfy teh technical requirements of the conventional island.The influence of minimum flow rate valve's capacity of MFP

the moment of inertia in rotating equipments

and the maximum speed of MFP upon equipments

and the maximum speed of MFP upon the deficit of feed-water is comparatively large.