Experimental validation of the seismic analysis methodology for free-standing spent fuel racks

Title: Experimental validation of the seismic analysis methodology for free-standing spent fuel racks
Authors: Gonzalez Merino, Alberto
Costas de la Peña, Luis
González, Arturo
Permanent link: http://hdl.handle.net/10197/10687
Date: 4-Jan-2019
Online since: 2019-05-28T14:09:58Z
Abstract: Spent fuel racks are steel structures used in the storage of the spent fuel removed from the nuclear power reactor. Rack units are submerged in the depths of the spent fuel pool to keep the fuel cool. Their free-standing design isolates their bases from the pool floor reducing structural stresses in case of seismic event. However, these singular features complicate their seismic analysis which involves a transient dynamic response with geometrical nonlinearities and fluid-structure interactions. An accurate estimation of the response is essential to achieve a safe pool layout and a reliable structural design. An analysis methodology based on the hydrodynamic mass concept and implicit integration algorithms was developed 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 rack mockups are submerged in free-standing conditions inside a rigid pool tank loaded with fake fuel assemblies and subjected to accelerations on a unidirectional shaking table. This article compares the experimental data with the numerical outputs of a finite element model built in ANSYS Mechanical. The in-phase motion of both units is highlighted and the water coupling effect is detailed. Results show a good agreement validating the methodology.
Funding Details: European Commission Horizon 2020
Type of material: Journal Article
Publisher: Elsevier
Journal: Nuclear Engineering and Technology
Volume: 51
Issue: 3
Start page: 884
End page: 893
Copyright (published version): 2019 Korean Nuclear Society
Keywords: Vibration testsFree-standingRackWater couplingHydroydynamic mass
DOI: 10.1016/j.net.2018.12.015
Language: en
Status of Item: Peer reviewed
Appears in Collections:Critical Infrastructure Group Research Collection
Earth Institute Research Collection
Civil Engineering Research Collection
TRUSS-ITN Research Collection

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