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원자로 상부헤드 관통노즐 균열에 대한 원인분석 및 건전성 평가
이경수,이성호,이정석,이재곤,이승건,Lee, Kyoung-Soo,Lee, Sung-Ho,Lee, Jeong-Seog,Lee, Jae-Gon,Lee, Seung-Gun 한국압력기기공학회 2013 한국압력기기공학회 논문집 Vol.9 No.1
This paper presents the results of integrity assessment for the cracks happened in reactor vessel upper head penetration nozzles. The crack morphology for a boat sample from crack area was analyzed through microscope. The stress condition including weld residual stress around crack was analyzed using finite element analysis. From the results of crack morphology and stress condition, the crack was concluded as primary water stress corrosion cracking. The integrity of the cracked nozzle was assessed by the methodology provided in ASME Section XI. According to the assessment results, the remaining life of the cracked nozzle was 1.43 yrs. and the plant decided to repair it.
레이더 반사도 유형분류 알고리즘을 이용한 청주 부근에서 관측된 강우시스템의 사례 분석
남경엽(Kyung-Yeub Nam),이정석(Jeong-Seog Lee),남재철(Jae-Cheol Nam) 한국기상학회 2005 대기 Vol.15 No.3
The characteristics of six precipitation systems occurred around Cheongju in 2002 are analyzed after the convective/stratiform radar echo classification using radar reflectivity from the Meteorological Research Institute's X-band Doppler weather radar. The Biggerstaff and Listemaa (2000) algorithm is applied for the classification and reveals a physical characteristics of the convective and stratiform rain diagnosed from the three-dimensional structure of the radar reflectivity. The area satisfying the vertical profile of radar reflectivity is well classified, while the area near the radar site and the topography-shielded area show a mis-classification. The seasonal characteristics of the precipitation system are also analyzed using the contoured frequency by altitude diagrams (CFADs). The heights of maximum reflectivity are 4 ㎞ and 5.5 ㎞ in spring and summer, respectively, and the vertical gradient of radar reflectivity from 1.5 ㎞ to the melting layer in spring is larger than in summer.