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고리 원전 가압기 PWOL의 용접 방향이 이종금속용접부 잔류응력 분포에 미치는 영향
배홍열(H-Y Bae),송태광(T-K Song),전윤배(Y-B Chun),오창영(C-Y Oh),김윤재(Y-J Kim),이경수(K-S Lee),박치용(C-Y Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Weld overlay is one of the residual stress mitigation method which arrest crack. An overlay weld sued in this manner is termed a preemptive weld overlay(PWOL). PWOL was good for distribution of residual stress of dissimilar metal weld(DMW) by previous research. Because range of overlay welding is wide relatively, residual stress distribution on PWR is affected by welding sequence. In order to examine the effect of welding sequence, PWOL was applied to a specific DMW of KORI nuclear power plant by finite element analysis method. As a result, the welding direction that from nozzle to pipe is better good for residual stress distribution on PWR.
원전 주배관의 응력부식 가상결함 성장에 대한 잔류응력 영향 평가
양준석(J.S.Yang),박치용(C.Y.Park),윤기석(K.S.Yoon),강선예(S.Y.Kang),오종근(J.K.Oho) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The most important mode of subcritical crack growth is primary water stress corrosion crack, which was the reported mechanism from the root cause analysis of the crack in the bimetallic welds. Stress corrosion crack growth evaluations was carried out for several flaw shapes of both axial and circumferential flaws, using the steady-state stresses including residual stresses. This evaluation considered the possibility of additional flaws in the primary loops of nuclear power plant, even though no such flaws have been identified by Ultrasonic Test. Consequently, Results show that the predicted flaw sizes will determine acceptability for continued service and maintenance.