Characteristics of Acoustic Emission from Check Valve Leaks at Nuclear Power Plants

摘要

This research is focused on the capability of acoustic emission (AE) technique to provide diagnostic information on the determination of check valve aging and degradation, check valve failures and undesirable operating modes. Several commercially available check valve diagnostic-monitoring methods were evaluated, especially for the techniques based on measurements of acoustic emission, ultrasonic, and accelerometer. In the present paper, acoustic emission signals due to leak from check valve with artificially leakage and artificially worn disk was studied both analytically and experimentally. The results of development of advanced signal processing and de-noising techniques also have been presented.