EXPERIMENT OF FLOATING SEISMIC ISOLATION SYSTEM FOR SMR

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<p>Experiment of a floating seismic isolation technology for application to small modular reactor (SMR) is conducted on a small-scale apparatus. The SMR is assumed to be located on land rather than offshore, and installed on a newly proposed floating structure in pool. The floating structure acts to mitigate the propagation of the horizontal component of seismic motion between the ground and the SMR buildings, and to reduce the excitation force on the buildings caused by the vertical wave propagation through water. The floating structure is designed to have a gaseous space called Air Cavity at the bottom of the structure. Experiment is conducted to verify the performance of the floating seismic isolation structure against various spectrums of seismic motions. The results demonstrate that the performance varies with earthquake input frequency and that the Air Cavity is effective to reduce peak response to horizontal and vertical earthquake accelerations particularly in the range of frequencies that are sensitive to nuclear plant piping.</p>

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