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다중계측기법을 이용한 유체누설 정량화 시스템에 관한 연구
김성영(Sung-young Kim),김영범(Young-bum Kim),권갑주(Kab-ju Kwon),이상국(Sang-gok Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The high energy fluid leakage from the high temperature and high differential pressure drop system of NPPs (Nuclear Power Plant) decreases efficiency and therefore leads to considerable economic loss due to less power production. Also the leakage possibly damages critical parts of components such as valve and trim and deteriorates its performance. This study identifies the leakage using the acoustic emission method in order to understand the leakage characteristics and to quantify amount of leakage on the valve having same conditions as secondary side valve of YoungKwang unit 1&2. The acoustic emission characteristics indicated considerable leakage over 0-2% damage of valve and the ultrasonic test characteristics indicated considerable leakage over 2-5% damage of valve. The program to quantify leakage and convert it into cost was developed using the database obtained from repeated tests.
영광 1,2호기 주중기 배수밸브 성능평가 및 설계개선에 관한 연구
김성영(Sung-young Kim),김영범(Young-bum Kim),권갑주(Kab-ju Kwon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
An important matter in a design technique about control valve is the development of design technique for the trim that relieve cavitaion, corrosion, abrasion, noise and vibration by high fluid resistance and pressure in the same volume. The study on performance evaluation and design improvement for main steam line drain valves in YoungKwang unit 1&2 NPPs (Nuclear Power Plant) aids the design of high efficiency control valve and the insurance of manufacturing capacity imported wholly from overseas before, the technical independence and the maintenance and the retrofit and upgrade of the existing control valve. Also the optimum design and manufacture of point parts in control valves will be made use of life time of equipments and maintenance by retrofit and upgrade through the replacement of the inside parts of the existing control valve with the industry facilities including NPPs.
원전 고온-고차압 조건을 모사한 유체누설 실증시험설비 구축
김성영(Sung-young Kim),김영범(Young-bum Kim),권갑주(Kab-ju Kwon),이상국(Sang-gok Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The high energy fluid leakage from the high temperature and high differential pressure drop system of NPPs (Nuclear Power Plant) decreases efficiency and therefore leads to considerable economic loss due to less power production. Also the leakage possibly damages critical parts of components such as valve and trim and deteriorates its performance. For the detection and quantify fluid leakage of high energy fluid leakage, the facility that can do field demonstration about the system of high temperature-pressure drop is needed. Through the field demonstration under the similarity about the MSS (Main Steam Line System) in YoungKwang unit 1 & 2, it is accomplished that the improvement of reliability to the quantify fluid leakage of fluid leakage at the valve and the development of fluid leakage test facility that can test the various pattern of fluid leakage. And the quantify fluid leakage system for the development of DB in high reliability is established.
고온 고압 컨트롤 밸브의 재료 특성에 따른 안정성 확보를 위한 수치 해석적 연구
안석호(Seok Ho Ahn),김재성(Jae Sung Kim),김재희(Jae hee Kim),권갑주(Kab Ju Kwon) (사)한국CDE학회 2022 한국CDE학회 논문집 Vol.27 No.2
In this study, stability evaluation was conducted through pressure structure analysis according to the material properties of high-temperature and high-pressure valves. To this end, physical properties analysis was conducted to enable analysis of high-temperature conditions of the five most commonly used materials in valve manufacturing. The stress generated in the parts was obtained by analyzing the obtained physical property values and the conditions that occurred during actual valve operation. The local plastic deformation was confirmed by comparing this with the yield stress of the material. In addition, by comparing the data obtained through the stress analysis in the thickness direction with the allowable stress obtained from the ASME code, A564-630 is not coated, A276-440C, A476-431 are coated according to the conditions, and A479-316, A479-410 is required to be coated.