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CFD Analysis of the Flow in Crud-Coated Nuclear Rod Bundles

[+] Author Affiliations
Nicolas Cinosi, Simon P. Walker, Mike Bluck, Raad I. Issa

Imperial College, London, UK

Paper No. ICONE22-30788, pp. V004T10A035; 9 pages
  • 2014 22nd International Conference on Nuclear Engineering
  • Volume 4: Radiation Protection and Nuclear Technology Applications; Fuel Cycle, Radioactive Waste Management and Decommissioning; Computational Fluid Dynamics (CFD) and Coupled Codes; Reactor Physics and Transport Theory
  • Prague, Czech Republic, July 7–11, 2014
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-4594-3
  • Copyright © 2014 by ASME


This paper presents a methodology to assess the effects of crud surface roughnesses on the normal operation of a PWR reactor.

A CFD methodology based on the use of RANS models and the implementation of roughness embedded in STAR-CCM+ CFD code has been developed and applied.

A typical PWR reactor case is investigated in details.

Results show how the presence of crudded rough rods induces a modification of the flow distribution as compared to the ideal case with clean smooth rods.

Notably, these modifications reflect a reduction of the mass flow rate, which in turn has a deteriorating consequence on the efficiency of the fuel-to-coolant heat transfer.

Copyright © 2014 by ASME



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