Nuclear instrumentation isolated output signal scaling method and system employing same

A computer device adapted to:

• receive an isolated voltage output from a Nuclear Instrumentation System cabinet (NIS) cabinet, wherein the NIS cabinet isolates a signal from a detector connected to an input of the NIS cabinet, wherein the isolated voltage output from the NIS cabinet associated with a nuclear reactor is calibrated, wherein calibration provides a range of inputs from a calibrated signal source as an input to the NIS cabinet, wherein a corresponding voltage output by the NIS cabinet resulting from each calibrated input from the range of inputs is measured, and wherein the values of the calibrated signal source used in the calibrating of the isolated voltage output and the resulting corresponding values of the voltage output in an as-left cabinet calibration data table are recorded;
• convert the isolated voltage output from the NIS cabinet to a converted detector signal using at least some values from the previously determined as-left cabinet calibration data table in an improved signal conversion equation created from a previously carried out calibration of the isolated voltage output using a calibrated signal source as an input to the NIS cabinet, wherein the improved signal conversion equation uses the calibration information from the NIS cabinet stored in the as-left cabinet calibration table;
• and
• determined determine a core design parameter by using the converted detector signal to solve an equation, wherein the core design parameter is indicative of reactivity measurements for the nuclear reactor.