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이재민; 김성우; 황성식; 김홍표; 김홍덕

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자료유형: 학술저널

저자정보: 이재민 김성우 황성식 김홍표 김홍덕

저널정보: 한국부식방식학회 Corrosion Science and Technology Corrosion Science and Technology 제13권 제3호

발행연도: 2014.1

수록면: 112 - 119 (8page)

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연구결과

초록· 키워드

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In this work, it is aimed to develop the fabrication method of axial stress corrosion cracking (SCC) defectshaving various sizes, on the outer diameter surface of the steam generator (SG) tubings. To control thelength of the artificial SCC defect, the specific area of the SG tubing samples was exposed to an acidicsolution after a sensitization heat treatment. During the exposure to an acidic solution, a direct currentpotential drop (DCPD) method was adopted to monitor the crack depth. The size of the SCC defect wasfirst evaluated by an eddy current test (ECT), and then confirmed by a destructive examination. From thecomparison, it was found that the actual crack length was well controlled to be similar to the length ofthe surface exposed to an acidic solution (5, 10, 20 or 30 mm in this work) with small standard deviation. From in-situ monitoring of the crack depth using the DCPD method, it was possible to distinguish a non-throughwall crack from a through wall crack, even though the depth of the non-through wall crack was not ableto be precisely controlled. The fabrication method established in this work was useful to simulate the SCCdefect having similar size and ECT signals as compared to the field cracks in the SG tubings of the operatingKorean PWRs.

#direct current potential drop method #eddy current test #non-through wall crack #steam generator tubing #stress corrosion cracking #through wall crack

참고문헌 (9)

참고문헌 신청

/ 2013 / American Society for Testing and Materials, E 647 Standard Test Method for Measurement of Fatigue Crack Growth Rates / ASTM International

D. H. Hur / 2000 / / J. Korean Soc. Nondest. Test 20 : 451 ~

P. E. MacDonald / 1996 / Steam Generator Tube Failures

R. Bandy / 1983 / / Corrosion 39 : 391 ~

S. S. Hwang / 2003 / / Corrosion 59 : 821 ~