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Thermal Fatigue in Mixing Tees: On-Going Program to Support Code Rule Improvements

[+] Author Affiliations
Claude Faidy

Electricité de France, Villeurbanne Cedex, France

Paper No. PVP2003-2000, pp. 129-135; 7 pages
doi:10.1115/PVP2003-2000
From:
  • ASME 2003 Pressure Vessels and Piping Conference
  • Fatigue, Fracture, and Damage Analysis
  • Cleveland, Ohio, USA, July 20–24, 2003
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4152-9
  • Copyright © 2003 by ASME

abstract

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 summarise the procedure, the background and some R&D results that support this procedure. The procedure is based on: • screening criteria without any duration consideration, only ΔT and material; • a simplified and conservative estimation of usage factor; • a detailed analyses of usage factor and crack growth rate, based on specific data collection of operating transients and fabrication parameters. Around that procedure, EDF launched an R&D program on fatigue curves and different fatigue reduction factors; thermal fatigue test on structures and review the agreement of predictions with French RHR system field experience. The major results confirm that, to-day, present Code rules (RCCM or ASME) are not totally in agreement with our results. Proposals and suggestions of future works are discussed in the paper.

Copyright © 2003 by ASME
Topics: Fatigue

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