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고온관 누설에 의한 가압열충격 사고시 원자로 용기의 건전성 평가를 위한 결정론적 파괴역학 해석
이상민,최재붕,김영진,박윤원,정명조,Lee, Sang-Min,Choi, Jae-Boong,Kim, Young-Jin,Park, Youn-Won,Jhung, Myung-Jo 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.11
In a nuclear power plant, reactor pressure vessel (RPV) is the primary pressure boundary component that must be protected against failure. The neutron irradiation on RPV in the beltline region, however, tends to cause localized damage accumulation, leading to crack initiation and propagation which raises RPV integrity issues. The objective of this paper is to estimate the integrity of RPV under hot leg leaking accident by applying the finite element analysis. In this paper, a parametric study was performed for various crack configurations based on 3-dimensional finite element models. The crack configuration, the crack orientation, the crack aspect ratio and the clad thickness were considered in the parametric study. The effect of these parameters on the maximum allowable nil-ductility transition reference temperature ($(RT_{NDT})$) was investigated on the basis of finite element analyses.
Zr-V-Mn-Ni 수소저장합금전극의 방전특성에 미치는 Ni 양의 효과에 관한 연구
이상민(Sang Min Lee),김동명(Dong Myung Kim),정재한(Jae Han Jung),이재영(Jai Young Lee) 한국수소및신에너지학회 1997 한국수소 및 신에너지학회논문집 Vol.8 No.1
ZrV<sub>0.7</sub>Mn<sub>0.5</sub>Ni<sub>1.2</sub> alloy is attractive for anode material in Ni/MH secondary battery because of its large hydrogen storage capacity in gas-solid reaction and long cycling durability in KOH electrolyte. In this work, in order to further improve the discharge performance of this alloy electrode, the alloy was annealed by optimal condition which is for 12 hours at 1000℃. The alloy annealed under optimal condition had higher rate capability and discharge capacity than as-cast one. The microstructure of the as-cast and annealed alloy was investigated by scanning electron microscopy and energy dispersive spectroscopy. Ni content in the matrix was increased, being this homogenized after annealing. Additionally, The measurement of the surface area by B.E.T. analysis showed that there was little difference as-cast and annealed alloy. Therefore, improvement in the rate capability of the annealed alloy is due to increase of Ni content in the matrix.