원전 탄소강 배관의 액적충돌침식 손상에 대한 B-Scan 검사 및 수치해석적 분석
A Study on the Thermal Hydraulic Analysis and B-Scan Inspection for LDIE Degradation of Carbon Steel Piping in a Nuclear Plant
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참고문헌
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초록
Liquid droplet impingement erosion (LDIE) known to be generated in aircraft and turbine blades is recently appeared in nuclear piping. UT thickness measurements with both A-scan and B-scan UT inspection equipments were performed for a component estimated as susceptible to LDIE in feedwater heater vent system. The thickness data measured with B-Scan equipment were compared with those of A-Scan. Thermal hydraulic analysis based on ANSYS FLUENT code was performed to analyze the behavior of liquid droplets inside piping. The wall thinning rate and residual lifetime based on both existing Sanchez-Caldera equation and measuring data were also calculated to identify the applicability of the existing equation to the LDIE management of nuclear piping. Because Sanchez-Caldera equation do not consider the feature of magnetite formed inside piping, droplet size,colliding frequency, the development of new evaluation method urgently needs to manage the pipe wall thinning caused by LDIE.
Abstract
Liquid droplet impingement erosion (LDIE) known to be generated in aircraft and turbine blades is recently appeared in nuclear piping. UT thickness measurements with both A-scan and B-scan UT inspection equipments were performed for a component estimated as susceptible to LDIE in feedwater heater vent system. The thickness data measured with B-Scan equipment were compared with those of A-Scan. Thermal hydraulic analysis based on ANSYS FLUENT code was performed to analyze the behavior of liquid droplets inside piping. The wall thinning rate and residual lifetime based on both existing Sanchez-Caldera equation and measuring data were also calculated to identify the applicability of the existing equation to the LDIE management of nuclear piping. Because Sanchez-Caldera equation do not consider the feature of magnetite formed inside piping, droplet size,colliding frequency, the development of new evaluation method urgently needs to manage the pipe wall thinning caused by LDIE.
참고문헌 (7)
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- Recommendations for Controlling Cavitation, Flashing, Liquid Droplet Impingement, and Solid Particle Erosion in Nuclear Power Plant Piping Systems, "EPRI", 2~7, pp.1011231 (2004)
- 이대영, "B-Scan 초음파 측정장비를 이용한 원전 배관 침식손상 검사법 개발", CORROSION SCIENCE AND TECHNOLOGY, 11(3), pp.89~95 (2012), 한국부식방식학회[DOI]
- K. M. Hwang, , Microsystem Technologies, 16, pp.1945~ (2010)
- FLUENT, "Fluent Tutorial Guide", pp.20.1~ (2001), Fluent Inc
- D. F. Tatterson, , AIChE Journal, 23, pp.68~ (1997)
- Prediction and Mitigation of Erosive-Corrosive Wear in Secondary Piping Systems of Nuclear Power Plants, "G. J. Keck", USNRC, 3~, pp.NUREG (1987), CR-5007 R5