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Predicting the sloshing motion of a coolant during a seismic assessment of a rectangular spent fuel poolis of critical concern. Linear theory, which provides a simple analytical method, has been used to predictthe sloshing motion in rectangular pools and tanks. However, this theory is not suitable for the highfrequencyexcitation problem. In this study, the authors developed a simple analytical method for predictingthe sloshing motion in a rectangular pool for a wide range of excitation frequencies. The correlationamong the linear theory parameters, influencing on excitation and convective waves, and theexcitation frequency is investigated. Sloshing waves in a rectangular pool with several liquid heights arepredicted using the original linear theory, a modified linear theory and computational fluid dynamicsanalysis. The results demonstrate that the developed method can predict sloshing motion over a widerange of excitation frequencies. However, the developed method has the limitations of linear solutionssince it neglects the nonlinear features of sloshing motion. Despite these limitations, the authors believethat the developed method can be useful as a simple analytical method for predicting the sloshingmotion in a rectangular pool under various external excitations

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