Method for calibrating steam generator water level measurement
First Claim
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.
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Abstract
A method is provided for determining and controlling feed water level in a steam generator of a nuclear power plant, whereby the water level sensor is calibrated in terms of the pressure drop across structural components in the feed water path. The water level differential pressure sensor is calibrated so that maximum water level is indicated as the level corresponding to the upper tap level plus the pressure drop across the foregoing structural components at maximum power plant power.
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Citations
4 Claims
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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:
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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. - View Dependent Claims (2, 3, 4)
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Specification