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

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Download Gonzalez_etal_2016_Dynamic_analysis_of_the_nonlinear_response_of_HDSFS.pdf761.08 KB
Author(s)
Gonzalez Merino, Alberto 
Costas de la Peña, Luis 
González, Arturo 
Uri
http://hdl.handle.net/10197/7909
Date Issued
30 August 2016
Date Available
08T15:35:36Z September 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.
Sponsorship
European Commission Horizon 2020
Other Sponsorship
Marie Skłodowska Curie grant agreement
Type of Material
Conference Publication
Keywords
  • Racks

  • Free-standing

  • FEM

  • Dynamic analysis

  • Nonlinear

  • Fluid-structure inter...

  • Hydrodynamic mass

Web versions
http://www.cerai.net/
Language
English
Status of Item
Peer reviewed
Description
Civil Engineering Research in Ireland (CERI 2016), Galway, Ireland, 29-30 August 2016
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Owning collection
Civil Engineering Research Collection
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Feb 7, 2023
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