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Transient 3D Stability Analysis of SCWR Rod Bundle Subchannels by a CFD Code

[+] Author Affiliations
M. Sharabi, W. Ambrosini

Università di Pisa, Pisa, Italy

S. He

University of Aberdeen, Aberdeen, UK

Pei-Xue Jiang, Chen-Ru Zhao

Tsinghua University, Beijing, China

Paper No. ICONE16-48701, pp. 727-733; 7 pages
  • 16th International Conference on Nuclear Engineering
  • Volume 3: Thermal Hydraulics; Instrumentation and Controls
  • Orlando, Florida, USA, May 11–15, 2008
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-4816-7 | eISBN: 0-7918-3820-X
  • Copyright © 2008 by ASME


The paper describes the application of CFD in simulating density wave oscillations in triangular and square pitch rod bundles. The FLUENT code is used for this purpose, addressing typical conditions proposed for SCWR conceptual design. The RELAP5 code and an in-house 1D linear stability code are also adopted to compare the results for instability thresholds obtained by different techniques. Transient analyses are performed both by the CFD code and RELAP5, with increasing heating rates and constant pressure drop across the channel, up to the occurrence of unstable behaviour. The obtained results confirm that the density wave mechanism is similar in rod bundle and in axisymmetric configurations.

Copyright © 2008 by ASME



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