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Type 316N 스테인리스강의 OPR1000 및 APR1400 가압기 밀림관 적용성에 대한 연구
유완(One Yoo),정성훈(Sung-hoon Jung),박성호(Sung-ho Park),손갑헌(Gap-heon Sohn),이봉상(Bong-sang Lee),김민철(Min-chul Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The applicability of stainless steel type 316N to the PZR surge-lines of OPR1000 and APR1400 is investigated. So far, strainless steel type 347 has been used for the OPR1000 surge-lines. The degree of improvement in the leak-before-break(LBB) and component design margin is evaluated when stainless steel type 347 is substituted by type 316N. For the study, the tensile and J-R tests on type 316N and type 347 stainless steels were performed at 316℃ and the microstructure of both types was examined. Stainless steel type 316N shows the higher values on the stress-strain curves, J-R curves and stress intensity, S<SUB>m</SUB>, compared to those of type 347. Therefore, stainless steel type 316N ensures the higher LBB and component design margins. As a result, this study shows that stainless steel type 316N could substitute type 347 for the surge-lines of OPR1000 and APR1400.
김용규,송명호,유완,Kim, Young Kyu,Song, Myung Ho,Yoo, One 한국에너지학회 2013 에너지공학 Vol.22 No.2
The steam generators of OPR-1000 plants have Alloy 600 and Alloy 690 as the tube material and its tube expansion method is the explosive expansion method. According to the experience of these plants, circumferential cracks were largely occurred in steam generator tubes expanded by the explosive expansion method and their locations were the outer surface of tube expansion transition region surrounding with piled-up sludge. But even though tubes have the same conditions, tubes with the hydraulic expansion method shows the prevail trend of axial cracks compared to circumferential cracks. Therefore in this study, in order to identify the difference of such phenomena as above, configurations of tube and tubesheet were modeled and at operating conditions, stress values applied in the tube expansion transition area in accordance with tube expansion methods were calculated by using computational program and the direction and the predominance of cracks were evaluated. 한국표준형원전(OPR-1000)의 증기발생기 전열관은 관재료로 Alloy 600과 Alloy 690이 사용되고 있으며 전열관 확관방법은 폭발확관법이 적용되었다. 원전 운전경험에 따르면 전열관 확관법으로 폭발확관법이 사용된 증기발생기의 전열관들은 원주방향 균열이 잘 발생하였으며 그 위치는 전열관의 확관천이부위 외면이었고 슬러지에 의해 둘러싸인 지역이었다. 그러나 같은 조건의 전열관이라도 수압확관법이 적용된 경우는 원주방향 균열보다는 축방향 균열이 우세한 경향을 보여왔다. 따라서 본 연구에서는 상기와 같은 차이를 규명하기 위하여 전열관과 관판의 형상을 모델링하였으며 확관법에 따라 운전중 조건에서 전열관의 확관천이 부위에 작용하는 응력의 크기를 전산프로그램을 사용하여 계산하였고, 균열의 방향성과 우세성을 평가하였다.
용접부 잔류응력에 기인한 경로의존성 J-적분의 측정에 대한 연구
강선예(Seon-Ye Kang),유완(One Yoo),박성호(Sung-Ho Park),윤기석(Ki-Seok Yoon),최택상(Taek-Sang Choi),이봉상(Bong-Sang Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The J-integral is an important fracture mechanics parameter applicable for many areas which provide the integrity evaluation methods. Fracture of welding structure usually starts at weld region due to high weld residual stress and defects easily found in it. However, it is difficult to calculate the correct J-integral of the structure containing weld because J-integral is path dependent due to the residual stress. It is also true that there are no evidence that the J-integral measuring methods suggested by the ASTM or others are appropriate for J-integral specimens with the residual stress. Therefore, in this paper, the J-integral measuring methods suggested by the ASTM or others were evaluated and the CMOD based J-integral measuring method is suggested as an appropriate method for measuring J-integral of specimens containing weld residual stress.
Alloy 690 TT 전열관의 결함 검출능 향상을 위한 MRPC Noise 신호기준에 대한 연구
최민석(Min Seok Choi),남금희(Keum Hee Nam),김종수(Jong Soo Kim),유완(One Yoo),허도행(Do Haeng Hur),최명식(Myung Sik Choi),이덕현(Deok Hyun Lee),심희상(Hee Sang Shim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
To investigate the influence of MRPC background noise on crack inspectability, the artificial cracks with different depth were produced on three Alloy 690 TT steam generator tube with different background noise using laser. MRPC noise and crack signal were analyzed using +point probe. As a result, it is possible to detect the cracks with the depth larger than 40% for high background noise, while to detect the cracks less than 30% for low background noise. Therefore, it is recommended that MRPC noise value would be at least 0.05 V to improve the crack detectability.