The pool tank of the research reactor has a pool door, which is located between the reactor pool and the service pool. It is used to separate the reactor pool from the service pool for the maintenance and/or removal of the equipment either in the reactor pool or in the service pool. The pool door consists of stainless steel plates supported by the structural steel frames and the sealing component. Also, it is contacted with the water in the pool tank. The pool door shall be designed considering the deadweight and the hydrostatic load of the water pressure. Also, it shall be designed to withstand loads induced by a seismic event. In this paper, the natural frequency for the free vibration of the rectangular plate in contact with the water is obtained using the ANSYS code. This result was compared with that of the theoretical analysis. Also, the impulsive force and convective force of the pool tank during an earthquake were calculated for an estimation of the structural integrity of the pool door.
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