Following the CIVAUX 1 incident of a leak on RHR system, EDF has developed a step by step procedure to screen and analyse similar locations: mixing tees with long duration at high ΔT between the 2 fluids. The paper presents the procedure, the background of the methodology and few R&D work that support this procedure. The procedure is based on: - screening criteria on maximum DT and minimum duration; - screening criteria without any duration consideration, only DT and material; - a simplified and conservative estimation of a usage factor; - a detailed analysis of usage factor and crack growth rate, based on specific data collection of operating transients. Around that procedure EDF launched an R&D program on fatigue curves and fatigue reduction factors for high cycle fatigue. The procedure is compared with field experience and recent R&D fatigue tests.
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12th International Conference on Nuclear Engineering
April 25–29, 2004
Arlington, Virginia, USA
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
0-7918-4688-1
PROCEEDINGS PAPER
Thermal Fatigue in Mixing Tees: Status and Justification of French Assessment Method Available to Purchase
Claude Faidy
Claude Faidy
Electricite´ de France, Villeurbanne Cedex, France
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Claude Faidy
Electricite´ de France, Villeurbanne Cedex, France
Paper No:
ICONE12-49584, pp. 197-204; 8 pages
Published Online:
November 17, 2008
Citation
Faidy, C. "Thermal Fatigue in Mixing Tees: Status and Justification of French Assessment Method." Proceedings of the 12th International Conference on Nuclear Engineering. 12th International Conference on Nuclear Engineering, Volume 2. Arlington, Virginia, USA. April 25–29, 2004. pp. 197-204. ASME. https://doi.org/10.1115/ICONE12-49584
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