The main objective of this study is to establish a simple method making it possible to analyze the dynamic characteristics of the nuclear fuel assembly considering the geometrical configuration and the supporting condition of reactor internals etc. without any prototype test or FE models. In this study, a general frequency expression has been suggested for Bernoulli-Euler beams with generally restrained boundary conditions using Fourier series as a mode function. And using the frequency expression, the natural frequencies and mode shapes of a conventional fuel assembly for OPR1000 plants with reactor end conditions are calculated and compared with the test results in order to figure out its applicability to estimation on vibration characteristics of the fuel assembly. As a result, since the method suggested in present study gives quite a similar one with test result, present method will be useful to perform design evaluation preliminarily on the vibration characteristic of developing new fuel assembly.

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