Dynamic analysis of the nonlinear response of high density fuel storage racks

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Title: Dynamic analysis of the nonlinear response of high density fuel storage racks
Authors: Gonzalez Merino, Alberto
Costas de la Peña, Luis
González, Arturo
Permanent link: http://hdl.handle.net/10197/7909
Date: 30-Aug-2016
Abstract: High Density Spent Fuel Storage racks are steel structures designed to hold nuclear spent fuel assemblies removed from the nuclear power reactor. Weighing around 60 tons, they are 5m high free-standing structures resting on the floor of a 12m depth pool and separated by only a few centimetres. Their underwater seismic response is a troubling safety issue, especially after Fukushima nuclear disaster. However, only limited basic guidelines have been provided as regulatory design criteria to date. The racks’ design deals with a very highly nonlinear behaviour, a transient dynamic response and a fluid-structure interaction problem. Industry is currently using available computer-aided finite element analysis software to solve the design problem in a cost-effective manner but some dispersion of results still exists. Hence, the nuclear regulatory authorities are requiring an evaluation of the current uncertainty associated to the assessment of rack displacements, rocking and maximum forces on supports. This paper discusses the main difficulties faced during the seismic analysis and presents an ad-hoc analysis methodology based on the hydrodynamic mass concept which takes advantage of a simplifying thermal analogy. The methodology, implemented in ANSYS FE Mechanical is hereby described for a reduced scale 2-rack model where the coupling effect of water in the dynamic motion of immersed racks is quantified and displacements and forces are provided. Finally, methodology assumptions are discussed and lessons learnt about the behaviour trends are summarized.
Funding Details: European Commission Horizon 2020
Type of material: Conference Publication
Keywords: RacksFree-standingFEMDynamic analysisNonlinearFluid-structure interactionHydrodynamic mass
Other versions: http://www.cerai.net/
Language: en
Status of Item: Peer reviewed
Conference Details: Civil Engineering Research in Ireland (CERI 2016), Galway, Ireland, 29-30 August 2016
Appears in Collections:Earth Institute Research Collection
Civil Engineering Research Collection
TRUSS-ITN Research Collection

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