Shear-bending buckling of the cylindrical part of Fast Breeder Reactor (FBR) main vessels under horizontal earthquake loading is one of the major problems in structural design. Therfore, the evaluation method of buckling strength is developed based on buckling tests and numerical calculations. The purpose of this paper is to describe the results of static and dynamic buckling tests of cylindrical shells and presented methods for buckling strength evaluation and seismic safety assessment. Shear buckling strength and bending buckling strength are evaluated under the assumption that both buckling modes interact slightly with each other. Then seismic safety assessment is performed, where effect of response reduction under dynamic loads is taken into account.
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