Patent ID: 7120218
Filing Date: 2006-10-10
Classification: G21D,Y02E

Abstract:
1. In a nuclear power plant, a method of controlling a steam generator feed water level, wherein a steam generator has an upper level tap corresponding to an upper level, a lower level tap corresponding to a lower level, the upper level tap and the lower level tap having a span there between, a maximum permissible feed water level positioned between said lower level and upper level taps, a structural component between the upper level tap and the lower level tap within the steam generator, and level sensor means for indicating water level between a first range limit and a second range limit, said sensor means being connected to at least said lower level tap comprising: providing a measure of a delta-pressure variation at about the lower level tap attributable to the structural component; calculating a measure of full feed water level as the upper level plus said measure of the delta-pressure variation; calibrating said level sensor means to provide an output at said first limit corresponding to an input thereto representative of said measure of full feed water level; and controlling said feed water level when said sensor means indicates that said high level setpoint has been reached.