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논문 기본 정보

자료유형
학술대회자료
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대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2006년도 춘계학술대회 강연 및 논문 초록집
발행연도
2006.6
수록면
1,106 - 1,111 (6page)

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In order to operate a nuclear reactor for a longer licensing time, it should be demonstrated that the irradiation embrittlement of the reactor will be adequately managed by ensuring that the fracture toughness properties are above a certain level of the safety margin. Master Curve Method is considered as the most promising tool to characterize the irradiated structural steels by using a fracture mechanics basis. In order to implement the master curve method into the assessment of an irradiation embrittlement of old power reactors for a continued long-term operation, the specimen geometry effects on the master curve results, the specimen reconstitution techniques from an existing old surveillance program should be clarified. In this study, weld reconstitution techniques to make a PCVN specimen from used surveillance specimen and specimen geometry effects on master curve to use 1X-WOL specimen were systematically investigated. Weld reconstitution techniques, which use an arc stud welding and 14 mm short inserts, could be successfully implemented into making PCVN specimens from broken halves of Charpy V-notch specimens. The weld heat affected zone was reasonably narrow and the master curve result was almost the same as the virgin specimens. 1X-WOL type specimens were also very useful for the master curve fracture toughness tests after the specimen dimensions and the loading jig alignment were modified to prevent a ligament arm bending and a non-symmetric strain field in front of the crack tip.

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