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원자력발전소 PSI/ISI 데이더 관리를 위한 지능형 데이더베이스 프로그램 개발 (제 2보)
박은수,박익근,엄병국,이종포,한치현,Park, Un-Su,Park, Ik-Keun,Um, Byong-Guk,Lee, Jong-Po,Han, Chi-Hyun 한국비파괴검사학회 2000 한국비파괴검사학회지 Vol.20 No.3
제 1보에서 Windows 환경 하에서 PSI/ISI 데이터의 효율적 관리 및 다원적평가와 분석이 가능한 고리 원전 PSI/ISI 데이터베이스 구축과 프로그램 개발(IDPIN)에 대해 소개하였다. 제 2보에서는 월성 원자력발전소 PSI/ISI 자료 관리를 위한 지능형 데이터베이스 프로그램(WS-IDPIN)을 개발하였다. 이 프로그램에는 월성 원전 PSI/ISI 관련 자료 분석 기능, PSI/ISI UT 검사 보고서 양식의 표준화와 전산 시스템화, PSI/ISI 비파괴검사 결과의 통계적 신뢰도 평가 프로그램(depth and length sizing performance 등) 등을 개발하여 원전 PSI/ISI 데이터 관리 전문가시스템(expert system)화에 한 단계 접근하였다. In a previous paper, we have discussed the intelligent Windows 95-based data management program(IDPIN) which was developed for effective and efficient management of large amounts of pre-/in-service inspection(PSI/ISI) data of Kori nuclear power plants. The IDPIN program enables the prompt extraction of previously conducted PSI/ISI conditions and results so that the time-consuming data management, painstaking data processing and analysis of the past are avoided. In this study, the intelligent Windows based data management program(WS-IDPIN) has been developed as an effective data management of PSI/ISI data for the Wolsong nuclear power plants. The WS-IDPIN program includes the modules of comprehensive management and analysis of PSI/ISI results, statistical reliability assessment program of PSI/ISI results(depth and length sizing performance etc), standardization of UT report form and computerization of UT results. In addition, the program can be further developed as a unique PSI/ISI data management expert system which can be part of the PSI/ISI total support system for Korean nuclear power plants.
강계명,박은수,심언덕,Kang, Kae-Myung,Park, Un-Su,Sim, Eon-Deok 한국재료학회 2002 한국재료학회지 Vol.12 No.8
The three-dimensional estimation on the depth and height of flaw by using the difference of radiographic contrast density was studied. First, the specimens having artificial flaws of various depths and heights were prepared and the radiographic testing was performed. The radiographic depth of flaw was investigated and estimated on the effect of the scattered radiation with the change of distance between flaw and film. The height of flaw was estimated from the radiographic test with the reference specimen. The radiographic contrast with flaw depth decreased with increasing the flaw depth. The scattered radiation increased with increasing flaw depth and varied with the location between flaw and film. However, in the case of flaw height, the contrast density increased with increasing flaw height. It is thought due to the change in volume generating the scattered radiation which reaches a film.
구상흑연주철에서 초음파 전파속도에 미치는 흑연형상의 영향
이계완,양노석,박은수 ( Kye Wan Lee,No Seok Yang,Un Su Park ) 한국주조공학회 1989 한국주조공학회지 Vol.9 No.3
N/A The relationships between nodularity, tensile property and ultrasonic velocity were studied in ductile iron castings having similar matrix structure. Also, the effects of heat treatment and the number of graphite nodules on the ultrasonic velocity were investigated. The results were as follows 1. The ultrasonic velocity increased proportionally with increassing nodularity and tensile strength. 2. The ultrasonic velocity in annealed and normalized state decreased average 1.7% and 3.4% respectively than that in as cast state. 3. The ultrasonic velocity increased with increasing the number of graphite nodules. Therefore, ductile iron castings can be evaluated in the only case of castings having the same manufacturing history by ultrasonic velocity.
초음파를 이용한 2.25Cr-1Mo 고온 구조재 열화ㆍ손상의 비파괴평가
박익근(Ik Keun Park),박은수(Un Su Park),김정석(Chung Seok Kim),김현묵(Hyun Mook Kim),권숙인(Sook In Kwun),변재원(Jai Won Byeon) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
Ultrasonic is a powerful nondestructive technique for the purpose of microstructure evaluation and getting the information of material properties in services facilities. In this study, nondestructive evaluation for degraded structural materials used at high temperature by conventional L-wave and surface SH-wave is discussed. Sixteen kinds of 2.25Cr-1Mo steel specimens with different degradation levels which were prepared by the isothermal aging heat treatment at 650℃ were evaluated by ultrasonic nondestructive evaluation investigating the change of attenuation coefficient analyzed by spectral analysis. As carbide precipitation increase and spherodization near grain boundary of microstructure to aging degradation, attenuation coefficient had a tendency to increase as aging time. It was identified possible to evaluate degradation using the characteristics of surface SH wave. Most of all, frequency dependency of ultrasonic attenuation coefficient to aging degradation appeared prominently on the surface SH-wave. And it was also observed that the change of ultrasonic attenuation with aging time was more sensitive at high frequency region and surface SH-wave mode.