Patent ID: 6021169
Filing Date: 2000-02-01
Classification: F22B,G21D,Y02E

Abstract:
A feedwater control system for a pressurized water steam generating system, which comprises:a first input signal, determined by a downcomer feedwater flow differential pressure;a second input signal, determined by a reactor power level;a first output signal, determined by said first and second input signals, which, when combined with a third input signal which is determined by a steam generator level, automatically controls at least one feedwater pump and first valves that comprise at least one economizer feedwater control valve, and at least one downcomer feedwater control valve, and regulate water flow from said at least one feedwater pump to a steam generator, when a steam generator steam load and a reactor are operating at a first predetermined power level; anda second output signal, determined by a steam generator water level, which automatically controls at least one startup feedwater control valve when said steam generator steam load and said reactor are operating at a second predetermined power level.