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Experimental validation of the seismic analysis methodology for free-standing spent fuel racks
Alberto Gonzalez Merino,Luis Costas de la Pena,Arturo Gonzalez 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.3
Spent fuel racks are steel structures used in the storage of the spent fuel removed from the nuclear powerreactor. Rack units are submerged in the depths of the spent fuel pool to keep the fuel cool. Their freestandingdesign isolates their bases from the pool floor reducing structural stresses in case of seismicevent. However, these singular features complicate their seismic analysis which involves a transientdynamic response with geometrical nonlinearities and fluid-structure interactions. An accurate estimationof the response is essential to achieve a safe pool layout and a reliable structural design. Ananalysis methodology based on the hydrodynamic mass concept and implicit integration algorithms wasdeveloped ad-hoc, but some dispersion of results still remains. In order to validate the analysis methodology,vibration tests are carried out on a reduced scale mock-up of a 2-rack system. The two rackmockups are submerged in free-standing conditions inside a rigid pool tank loaded with fake fuel assembliesand subjected to accelerations on a unidirectional shaking table. This article compares theexperimental data with the numerical outputs of a finite element model built in ANSYS Mechanical. Thein-phase motion of both units is highlighted and the water coupling effect is detailed. Results show agood agreement validating the methodology.
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