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김종민(Jong-min Kim),배재현(Jae-hyun Bae),손갑헌(Gap-heon Sohn),윤기석(Ki-seok Yoon),최택상(Taek-sang Choi) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The probabilistic fracture analysis is used to determine the effects of uncertainties involved in material properties, location and size of flaws, etc, which can not be addressed using a deterministic approach. In this paper the probabilistic fracture analysis is applied for evaluating the RV(Reactor Vessel) under PTS(Pressurised Thermal Shock). A semi-elliptical axial crack is assumed in the inside surface of RV. The selected random parameters are initial crack depth, neutron fluence, chemical composition of material (copper, nickel and phosphorous) and RTNDT. The deterministically calculated KI and crack tip temperature are used for the probabilistic calculation. Using Monte Carlo simulation, the crack initiation probability for fixed flaw and PNNL(Pacific Northwest National Laboratory) flaw distribution is calculated. As the results show initiation probability of fixed flaw is much higher than that of PNNL distribution, the postulated crack sizes of 1/10t in this paper and 1/4t of ASME are evaluated to be very conservative.
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.
송민섭(Min-sup Song),강선예(Sun-ye Kang),박준수(June-soo Park),손갑헌(Gap-heon Sohn) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
DMWs are common feature of the PWR in the welded connections between carbon steel and stainless steel piping. The nickel-based weld metal, Alloy 82/182, is used for welding the dissimilar metals and is known to be susceptible to PWSCC. A round-robin program has been implemented to benchmark the numerical simulation of the transient temperature and weld residual stresses in the DMWs. To solve the round-robin problem related to Pressurizer Safety & Relief nozzle, the thermal elasto-plastic analysis is performed in the DMW by using the FEM. The welding includes both the DMW of the nozzle to safe-end and the SMW of the safe-end and piping. Major results of the analyses are discussed: The axial and circumferential residual stresses are found to be -88㎫(225㎫) and -38㎫(293㎫) on the inner surface of the DMW; where the values in parenthesis are the residual stresses after the DMW. Thermo-mechanical interaction by the SMW has a significant effect on the residual stress fields in the DMW.
〈기술논문〉 설계기준 초과 과도조건을 가정한 한국 표준형 원전 가압기 밀림노즐 구조건전성에 관한 연구
박정수(Jeong Soo Park),김종민(Jong Min Kim),강선예(Seon Ye Kang),박성호(Sung Ho Park),손갑헌(Gap Heon Sohn) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Out-of-Limit Transients due to thermal stratification are discovered in the pressurizer of the nuclear power plants supplied by Westinghouse. The occurring of out-of-limit transients are not reported in the pressurizer of OPR1000. However, the occurring of out-of-limit transients are assumed for the pressurizer of OPR1000 and are evaluated for the pressurizer surge nozzle structural integrity. The evaluation results show that the ASME Code requirements are met even though out-of-limit transients are considered additionally.