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Boron Concentration Model and Effects of Boron Holdup on Axial Offset Anomaly (AOA) in PWRs

[+] Author Affiliations
Dawei Zhou, Barclay G. Jones

University of Illinois at Urbana-Champaign, Urbana, IL

Paper No. ICONE10-22636, pp. 829-834; 6 pages
  • 10th International Conference on Nuclear Engineering
  • 10th International Conference on Nuclear Engineering, Volume 4
  • Arlington, Virginia, USA, April 14–18, 2002
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-3598-7 | eISBN: 0-7918-3589-8
  • Copyright © 2002 by ASME


A significant number of current PWRs are experiencing axial offset anomaly (AOA), a condition that continues to elude prediction and thus creates an operational difficulty of being unable to accurately estimate safety margin. The cause of AOA is complex, involving both thermal-hydraulics and chemistry of core operation and design. This paper considers the structure of crud layers, which lead to AOA, and presents a thermal performance and neutron absorber concentration model for the crud layer that satisfactorily predicts the amount of boron accumulated to match that required to cause the observed power shifts.

Copyright © 2002 by ASME



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