증기발생기 전열관 2차측 응력부식균열의 실험실적 모사 방법
Laboratorial technique for fabrication of outer diameter stress corrosion cracking on steam generator tubing
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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.
Abstract
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.
참고문헌 (9)
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