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The purpose of this study is to verify availability of the acoustic emision in-situ monitoringmethod to the internal leak and operating of the major valves at nuclear power plants. In this study, acoustic emission tests are performed when the pressurized temperature water and steam flowed through glove valve(main steam dump valve) and check valve(main steam outlet pump check valve) on the normal size of 12 and 18 ". The valve internal leak monitoring 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 To improve the reliability, a judgment of leak on the system was used various factors which are AE parameters, trend analysis, frequency analysis, voltage analysis and amplitude analysis of acoustic signal emited from the valve operating condition internal 접수일 : 2007년 1월 25일, 채택확정 : 2007년 2월 10일이상국(책임저자) : 한전전력연구원 원자력연구실 E-mail : sglee@kepri.re.kr Tel. 042-865-5650