Evaluation of the Motor-Operated Valve Analysis and Test System (MOVATS) to Detect Degradation, Incorrect Adjustments, and Other Abnormalities in Motor-Operated Valves.

摘要

As a part of the NRC Nuclear Plant Aging Research (NPAR) program, a field test program was carried out to evaluate a technique of valve signature analysis to detect and differentiate abnormalities, including time-dependent degradation (aging) and incorrect adjustments in motor-operated valves. The technique described in the report is the Motor-Operated Valve Analysis and Test System (MOVATS) which is commercially available from MOVATS, Inc. In-situ signature traces were obtained on 36 motor-operated valves at 4 nuclear plant sites. Described in the letter report are the test equipment package, the method of obtaining the signatures, and the determinations made as a result of analyzing these signatures. Based on evaluations of the signature analysis technique, and on the results obtained from the field test program, the capabilities and limitations of MOVATS are discussed.