The spent fuel taken out of a reactor in a nuclear power plant is temporarily stored in a spent
fuel rack until it is carried out to an intermediate storage facility or a reprocessing facility. The
spent fuel rack requires high earthquake resistance. The free-standing rack has no supporting
members around it and disperses seismic energy with friction by sliding, and the water around the
rack reduces the response. Therefore, it can be expected to provide high earthquake resistance. In
consideration of three-dimensional behavior, collisions and fluid-structure interaction
accompanied by sliding and rocking during a large excitation, the seismic evaluation method for
the free-standing rack was established, and its validity was confirmed through a comparison with
the results of the full-scale excitation test conducted at E-Defense. In this report, the seismic
evaluation method for the free-standing rack is described.
