http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
〈응용논문〉 : 가압기 밀림배관에 대한 환경피로계수 감소 방안 고찰
강선예(Sun-Yeh Kang),김규완(Kyu-Wan Kim),송민섭(Min-Sup Song),양준석(Jun-Seog Yang),윤기석(Ki-Seok Yoon),최택상(Taek-Sang Choi) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
가동원전을 계속운전하기 위한 심사시 규제기관에서는 NUREG/CR-6260에 기술된 위치를 포함한 피로취약 부위에 대해 원자로냉각재 환경을 고려한 피로평가를 수행할 것을 요구하고 있다. 가압기 밀림관은 환경피로평가결과 ASME 허용값을 만족시키기 어려운 부위중 하나이다. 밀림관에서 환경보정계수값은 최대 15.35까지 계산되므로 환경피로계수는 ASME Code 허용값(1.0)을 초과할 수 있다. 본 논문에서는 NUREG/CR-5704에 기술된 방법을 적용한 환경보정계수 계산 방법론, 가동원전 WEC형 가압기 밀림관 용접부에 대해 보수적인 피로해석 방법론을 적용한 환경피로계수 계산, ASME Code 요건을 만족시키기 위한 환경피로계수 감소 방안에 대해 논의하였다. 결론적으로, 본 논문에서 제안한 환경피로 계수 감소방안을 적용할 경우 가동원전 WEC형 가압기 밀림관 용접부의 환경피로계수는 크게 감소하는 것으로 평가되었다. For the plant life extension, the regulatory body requires the assessing of reactor coolant environmental impact on a critical components that includes, as a minimum, those selected in NUREG/CR-6260. The pressurizer surge line is the most difficult to meet the ASME code limit for fatigue evaluations considering the effects of LWR environments. The environmental usage factor values can exceed allowable limit(1.0) of the ASME Code because the cumulative usage factor increase by a factor of maximum 15.35. This paper describes Methodology of the environmental correction factor calculation using the method described in NUREG/CR-5704, the calculation of environmental fatigue usage factor based on a conservative approach for ASME fatigue evaluation, and five(5) proposed schemes to reduce the environmental CUF to below the ASME Code limit. Finally, the environmental CUF at WEC Type surge line welding locations could be reduced considerably by using the proposed schemes.
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.
최동현,장윤석,강선예 한국압력기기공학회 2022 한국압력기기공학회 논문집 Vol.18 No.2
In order to prepare for a future nuclear market, research for developing floating small modular reactor has been initiated with the aim of differentiating it from large nuclear power plants such as distributed power, heat supply to remote communities and sea water desalination. Depending on the characteristics of the small modular reactor, it is necessary to design a plate and shell heat exchanger that can be manufactured smaller than the U-tube recirculation method. In this study, 12 cases are selected by changing the diameter of the heat plate, the thickness of the device body and the size of the stiffener. Finite element analysis is performed by setting the stress classification lines for the point at which deformation is expected under external pressure conditions for these analysis cases. For the basic design of the plate and shell heat exchanger, the optimal conditions are derived by analyzing the tendency of stress change in the device body and stiffener.
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.
김승현,김연정,이한걸,강선예 한국압력기기공학회 2022 한국압력기기공학회 논문집 Vol.18 No.1
Nuclear Power Plants (NPP) should be designed to have sufficient safety margins and to ensure seismic safety against earthquake that may occur during the plant life time. After the 9.12 Gyeongju earthquake accident, the structural integrity of nuclear power plants due to the beyond design basis earthquake is one of key safety issues. Accordingly, it is necessary to conduct structural integrity evaluations for domestic NPPs under beyond design basis earthquake. In this study, the Level 3 LBB (Leak Before Break) evaluation was performed by considering the beyond design basis earthquake for the surge line of a OPR1000 plant of which design basis earthquake was set to be 0.2g. The beyond design basis earthquake corresponding to peak ground acceleration 0.4g at the maximum stress point of the surge line was considered. It was confirmed that the moment behaviors of the hot leg and pressurized surge nozzle were lower than the maximum allowable loading in moment-rotation curve. It was also confirmed that the LBB margin could be secured by comparing the LBB margin through the Level 2 method. It was judged that the margin was secured by reducing the load generated through the compliance of the pipe.