FEEDWATER CONTROL OVER FULL POWER RANGE FOR PRESSURIZED WATER REACTOR STEAM GENERATORS

摘要

Feedwater control systems and methods are described for a steam generation system in a pressurized water reactor, where the first input signal, the power of the reactor, is determined by the feedwater flow differential pressure of the downcomer. A steam load of the steam generator, when combined with a second input signal determined by the level, the first input signal and the second input signal, and in combination with a third input signal determined by the level of the steam generator; A first output signal that automatically controls at least one feed pump and a designated valve that regulates the feed flow from the at least one feed pump to the steam generator when the reactor is operating at a first predetermined output level, And the feedwater level of the steam generator, when the steam load and the reactor of the steam generator operate at a second predetermined output level, Least a second output signal for automatically controlling the start of a water supply control valve. In a preferred embodiment of the invention, the first designated valve comprises at least one economizer feedwater control valve and at least one downcomer water feed control valve. Also in a preferred embodiment of the present invention, the first predetermined output level is between about 5% and about 20%, and the second predetermined output level is between 0% and about 5%.