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큰 외경 튜브집합체를 위한 삽입형 지지체의 충격강도해석
김재용(JeaYong Kim),윤경호(KyungHo Yoon),이영호(YoungHo Lee),이강희(KangHee Lee),김형규(HyungKyu Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Insertion type spacer grid structure for dual cooled nuclear fuel is developed to support a dual cooled fuel and to keep guide tubes straight. To evaluate the impact characteristics such as critical impact velocity, buckling strength and duration time, single impact analysis has been performed to simulate pendulum type impact test. Initial impact velocity is increased from 561 ㎜/s until the spacer grid support is buckled. 12 by 12 size spacer grid and Zircaloy-4 material are used for impact analysis. Explicit analysis is conducted by using commercial finite element analysis program, ABAQUS. The local buckling point is decided when the slope for increment of impact force is sharply descending after ascending in impact force curve via velocity. Through this analysis the dynamic failure behavior of insertion type spacer grid is predicted.
외압을 받는 이중동심튜브의 신장차이에 의한 변형거동해석
김재용(JaeYong Kim),윤경호(KyungHo Yoon),김형규(HyungKyu Kim),고성호(SungHo Ko) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The diameter of a dual cooled fuel (DUO) including an inner flow passage to enhance thermal efficiency and safety is larger than that of a conventional fuel rod by about 1.6 times. It consists of annular pellets, coaxial inner/outer tubes and upper/lower end-plugs. Generally, the diameter and length of conventional fuel rods in a nuclear fuel assembly are differently altered due to neutron irradiation and high temperature in a reactor. Reflecting this, the coaxial inner and outer tubes will certainly grow differently. So, there occurs a technical issue, that is, whether soundness of them is maintained or not, and how those are deformed. It is necessary to investigate whether Euler’s buckling equation could be applied to DUOs or not. In this paper, we suggest a numerical methodology to predict the deformation of DUOs due to the different growth of inner and outer coaxial tubes. It was found that Euler's equation cannot be applied since the deformed shape of the fuels were different.