Vibration tests of an underwater free-standing 2-rack system

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Title: Vibration tests of an underwater free-standing 2-rack system
Authors: Gonzalez Merino, Alberto
Costas de la Peña, Luis
González, Arturo
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Date: 30-Aug-2018
Online since: 2018-11-08T10:05:21Z
Abstract: Nuclear power plants are responsible for the spent fuel management. Closely spaced racks submerged in a pool are generally used to store and to cool the nuclear fuel. A free-standing design allows to isolate the rack base from the pool floor and therefore to reduce the impact of seismic loads. However, the seismic response of free-standing racks is difficult to predict accurately using theoretical models given the uncertainties associated with inertial forces, geometrical nonlinearities, and fluid-structure interactions. An ad-hoc analysis methodology has been developed to overcome these difficulties in a cost-effective way, but some dispersion of results still remains. In order to validate the analysis methodology, experimental tests are carried out on a scaled 2-rack mock-up equipped with fake fuel assemblies. The two rack units are submerged in free-standing conditions inside a rigid pool tank and subjected to accelerations on a unidirectional shaking table. A hydraulic jack induces a given acceleration time-history while a set of sensors and gauges monitor the transient response of the system. Accelerometers track the acceleration of the pool and units. Load cells measure the impact forces on the rack supports as well as the fluid forces at the centre of the rack faces. Video cameras record the transient displacements and rotations. Results provide evidence of a water-coupling effect leading to an in-phase motion of the units.
Funding Details: European Commission Horizon 2020
Type of material: Conference Publication
Publisher: CERAI
Keywords: Vibration testFree-standingRackWater coupling
Language: en
Status of Item: Peer reviewed
Is part of: Proceedings of the Civil Engineering Research In Ireland Conference (CERI 2018)
Conference Details: The 2018 Civil Engineering Research in Ireland Conference (CERI 2018), Dublin, Ireland, 29-30 August
Appears in Collections:Critical Infrastructure Group Research Collection
Earth Institute Research Collection
Civil Engineering Research Collection
TRUSS-ITN Research Collection

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