A simplified evaluation method of impact loads for the nuclear power plant structures due to the waterborne debris is proposed. In this study, the maximum shock response displacement is obtained on the assumption that the impulse of the collision is constant. Then the maximum shock response displacement is used to evaluate structural damage by the classical elastic and elasto-plastic analysis. To verify the proposed method, impact analysis with FEM was performed. Comparisons of the maximum displacement and the maximum effective strain between the impact analysis and the proposed method show the conservative estimation of these values by the proposed method.
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