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김대웅(Kim Dae Woong),김학중(Kim Hak Joong),박성근(Park Sung Gun),김양석(Kim Yang Seok) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
POV(Power-operated valve) consists of actuator that produces power and valve. Power-operated valves are classified into MOV(motor-operated valve), AOV(air-operated valve), extra valves such as solenoid valve according to actuator type; gate valve, globe valve and butterfly valve according to valve type. Since some POVs in US had been failed to perform a safety function, US NRC had recommended to verify the operability of POVs through Generic Letters. Korean regulatory organization also recommended to perform the safety evaluation for POVs. This paper describes the determining safety-significance and categorization methodology in the safety evaluation methodology for AOVs. In general, nuclear power plants have a large population of AOVs with varying degrees of safety-significance. Therefore, to perform an effective AOV evaluation, it is essential to establish a method to clearly identify those AOVs with the highest contribution to safe plant operation. The AOV evaluation program utilizes risk-informed methods to determine the in-scope AOV population. It is expected that utilities will develop a plant specific AOV evaluation program. There are many various type of Nuclear Power Plants in Korea. Through this study, it will be provided all Korean NPPs applicable methodology for determining safety-significance and categorization of AOV. The safety-significance classification shall involve a blended process of risk ranking and plant expert panel evaluation. AOVs are placed in one of two categories (Categories 1 and 2) based on their contribution to safe plant operation and/or accident mitigation. The requirements of the AOV evaluation are dependent on the category in which each AOV is assigned. These categories determine the extent of design review and testing activities to be performed.
박성근(Sungkeun Park),이도환(Do Hwan Lee),정성희(Sunghee Jung),채장범(Jangbum Chai) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
An MOV(Motor Operated Valve) is a valve system which is operated by an electric motor. The actuator in an MOV is composed of a motor, a worm, a worm gear and bearings. Faults of these components affect the performance of MOVs. Therefore detecting the faults of components before their break will contribute greatly to the safe operation of power plants. However it is very difficult to inspect the components without disassembly. In this paper, we diagnose the worm gear by examining motor torque signature, since the condition of the worm gear is related to the motor torque signature. We tested a worn gear and broken teeth. The rotating parts such as the valve shaft was reviewed and the actuator was checked additionally. For the tests, a simulator was designed and manufactured.