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UO₂ 소결체 끝단 형상 변경에 따른 연료봉 설계 영향 평가
나연수(Yeon Soo Na),주민제(Min Jae Ju),김경태(Kyung Tae Kim),김윤호(Yoon Ho Kim),이승재(Seung Jae Lee) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
Missing pellet surface(MPS) are one of the causes of Pellet-Clad Mechanical Interaction(PCMI) failure of cladding in nuclear power plants(NPPs) and it results in reducing the product quality and integrity of nuclear fuels. Thus, in order to increase the MPS resistance of UO₂ pellets, it is very important to improve the thoughtness and to change the shapes of UO₂ pellet end-face. Especially, changing the shape of UO₂ pellet end-face is able to effectively improve MPS resistance of UO₂ pellets. Therefore, this study was selected candidate MPS resistant UO₂ pellet end-face shape by FEM and then performed nuclear fuel rod design for 5-types MPS resistance UO₂ pellet by commercial ROPER code. Based on the results of nuclear fuel rod design simulation, the effect of integrity of nuclear fuel rod with UO₂ pellet’s end-face shape change was evaluated.
자유 낙하 충격 시험을 통한 UO₂ 소결체 표면결함에 미치는 End-face 형상 영향 평가
나연수(Yeon Soo Na),최민영(Min Young Choi),임광영(Kwang Young Lim),류수필(Su Pil Ryu),이승재(Seung Jae Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Missing pellet surface(MPS) is one of deterioration caused by pellet-clad mechanical interaction(PCMI) mechanism of cladding in nuclear power plants(NPPs) and it results in reducing the product quality and integrity of nuclear fuels. Thus, in order to increase the MPS resistance of UO₂ pellets, it is very important to improve the thoughtness and to change the shapes of UO₂ pellet end-face. Especially, changing the shape of UO₂ pellet end-face is able to effectively improve MPS resistance of UO₂ pellets. Therefore, this study was selected candidate MPS resistant UO₂ pellet end-face shape by FEM and then performed free drop impact test using fabricated UO₂ pellet end-face shape. Based on the results of experiment, the effect of end-face shape of UO₂ pellet on missing pellet surface was investigated.
내부 감육곡관의 손상압력에 미치는 하중조건 및 원주방향 결함폭의 영향 평가
나연수(Yeon-Soo Na),김진원(Jin-Weon Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Wall thinning defect due to flow-accelerated corrosion (FAC) is one of the degradation mechanisms of carbon steel piping components in nuclear power plant (NPP), and it results in reducing load carrying capacity and fatigue resistance of the piping components. Especially, the wall-thinning defect leads to abrupt rupture of piping components under normal operating pressure. Thus, it is important to accurately evaluate the failure pressure of piping components containing an internal wall-thinning defect for ensuring integrity of piping system of NPP. Therefore, this study performed failure tests using real-scale elbows containing simulated wall-thinning defect under internal pressure and bending moment. Based on the results of experiments, the effect of circumferential thinning angle and bending moment on the failure pressure was investigated.