Westinghouse Electric Corporation

Charles G Geis

James A Neuner

Dirk J Boomgaard

Michal M Feilchenfeld

Susan A Wilbur

Fred J Mills

James D Fetrow

A rod position indicating system for a pressurized water reactor generates within containment redundant sets of digital detector signals and applies both sets to each of two communications buses each controlled by a separate bus controller/serial output device located inside of containment. A pair of redundant serial data links transmits the redundant data from each bus controller/serial output device through containment to a dedicated CRT display and the plant computer each of which generates rod position displays from redundant information selected from one of the data links. The data for each rod is selected individually from the redundant signals received on the one data link. Rod position is presented in bargraph form on a multi-page display which includes overall status information along with the detailed presentations.

Method and apparatus for remotely monitoring a process carried out in a

A digital rod position indicator having discrete coils spaced along the travel path of an elongated magnetically permeable member stores in digital form compensation signals for automatically adjusting the location relative to the coils at which the digital output signal representative of the position of the end of the elongate member transitions from one code to the next. The appropriate compensation signal is addressed using the digital output signal and a correction factor which takes into account the direction of movement including reversals.

Digital, electromagnetic rod position indicator with precisely

A method for temperature compensating a position indicator which includes a sensor for producing an output signal whose magnitude corresponds to the position of an element that is linearly movable between first and second positions and which is subject to changes in temperature within a given temperature range and wherein the output signal of the sensor contains a temperature variable offset component and the rate of increase of the output signal as the element moves from the first to the second position fluctuates with changes in temperature. The method includes measuring the temperature of the medium; generating an electrical representation of an offset correction, relative to a reference temperature, required in the offset component of the output signal of the sensor at the temperature of the element; generating electrical representations of a rate correction factor, relative to a reference temperature, required for the rate of increase in the output signal of the sensor at the temperature of the element; causing the sensor to produce an output signal corresponding to the position of the element; and compensating the output signal of the sensor by forming an electrical representation of the product of the sensor output signal and the rate correction factor at the measured temperature of the medium, and adding to such product the offset correction at the measured temperature of the medium.

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N. Huntingdon, PA, United States of America

Charles G Geis