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학술저널
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저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제50권 제4호
발행연도
2018.1
수록면
589 - 598 (10page)

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To maintain safety and reliability of reactors, redundant sensors are usually used to measure criticalvariables and estimate their averaged time-dependency. Nonhealthy sensors can badly influence theestimation result of the process variable. Since online condition monitoring was introduced, the onlinecross-calibration method has been widely used to detect any anomaly of sensor readings among theredundant group. The cross-calibration method has four main averaging techniques: simple averaging,band averaging, weighted averaging, and parity space averaging (PSA). PSA is used to weigh redundantsignals based on their error bounds and their band consistency. Using the consistency weighting factor(C), PSA assigns more weight to consistent signals that have shared bands, based on how many bandsthey share, and gives inconsistent signals of very low weight. In this article, three approaches areintroduced for improving the PSA technique: the first is to add another consistency factor, so called trendconsistency ðTCÞ, to include a consideration of the preserving of any characteristic edge that reflects thebehavior of equipment/component measured by the process parameter; the second approach proposesreplacing the error bound/accuracy based weighting factor ðWaÞ with a weighting factor based on theEuclidean distance ðWdÞ; and the third approach proposes applying Wd; TC; and C; all together. Coldneutron source data sets of four redundant hydrogen pressure transmitters from a research reactor wereused to perform the validation and verification. Results showed that the second and third modifiedapproaches lead to reasonable improvement of the PSA technique. All approaches implemented in thisstudy were similar in that they have the capability to (1) identify and isolate a drifted sensor that shouldundergo calibration, (2) identify a faulty sensor/s due to long and continuous missing data range, and (3)identify a healthy sensor.

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