경수로용 고유 지지격자 스프링의 탄소성 특성해석 및 시험

The elastic-plastic characteristic of the spacer grid spring in a nuclear fuel assembly is important to evaluate the supporting capability of a fuel rod. However, the characteristic for the fuel assembly design is usually obtained from the test. In this paper, the finite element analyses on the KAERI designed spacer grid springs are performed in order to get their characteristic curves. The appropriate boundary condition in the characteristic analysis of a spacer grid spring is proposed by comparisons with test results.