Modeling and Thermal Performance Evaluation of Porous Curd Layers in Sub-Cooled Boiling Region of PWRs and Effects of Sub-Cooled Nucleate Boiling on Anomalous Porous Crud Deposition on Fuel Pin Surfaces
A significant number of current PWRs around the world are experiencing anomalous crud deposition in the sub-cooled region of the core, resulting in an axial power shift or Axial Offset Anomaly (AOA), a condition that continues to elude prediction of occurrence and thermal/neutronic performance. This creates an operational difficulty of not being able to accurately determine power safety margin. In some cases this condition has required power ''down rating'' by as much as thirty percent and the concomitant considerable loss of revenue for the utility. This study examines two aspects of the issue: thermal performance of crud layer and effect of sub-cooled nucleate boiling on the solute concentration and its influence on initiation of crud deposition/formation on fuel pin surface.
- Research Organization:
- University of Illinois at Urbana-Champaign (US)
- Sponsoring Organization:
- (US)
- DOE Contract Number:
- FG07-00ID13924
- OSTI ID:
- 841238
- Report Number(s):
- DE/ID/13924; TRN: US0502414
- Resource Relation:
- Other Information: PBD: 27 Jun 2005
- Country of Publication:
- United States
- Language:
- English
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