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Acoustic emision technology is applied to diagnosis the internal leak and operating conditions of themajor valves at nuclear power plants. The purpose of this study is to verify of the acoustic emision as in-situ diagnosis method. In this study, acoustic emission tests are performed when the pressurized high temperature steam flowed through gate valve(1st stage reheater valve) and glove valve(main steam dump valve) on the normal size of 4 and 8 ". The valve internal leak diagnosis system for practical field was designed. The acoustic emision method was applied to the valves at the site, and the background noise was measured for the abnormal plant condition. To the reliability, a judgment of leak on the system was used various factors which are AE parameters, trend analysis, signal level analysis and RMS(root mean square) analysis of acoustic signal emited from the valve operating condition internal leak.접수일 : 2007년 1월 25일, 채택확정 : 2007년 2월 10일이상국(책임저자) : 한전전력연구원 원자발전연구소 E-mail : sglee@kepri.re.kr Tel. 042-865-5650박종혁, 유근배 : 한전전력연구원 원자력발전연구소