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Residual Stress Modeling of Warm-Bent Tight-Radius CANDU Feeder Bends

[+] Author Affiliations
Y. Ding

Atomic Energy of Canada Limited, Chalk River, ON, Canada

M. Yetisir

Atomic Energy of Canada Limited, Mississauga, ON, Canada

Paper No. PVP2008-61113, pp. 449-455; 7 pages
doi:10.1115/PVP2008-61113
From:
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 7: Operations, Applications and Components
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4830-2 | eISBN: 0-7918-3828-5
  • Copyright © 2008 by Atomic Energy of Canada Ltd.

abstract

In one CANDU® nuclear station, a few feeder piping failures have occurred because of stress corrosion cracking. All the cracks were located in tight-radius bends. Root cause analyses indicated that the residual stress played a significant role in these failures. Residual stress measurements using the neutron diffraction technique have been performed to quantify the residual stresses for a large number of feeder bends. Numerical simulations have also been performed to supplement the measurement data. This paper presents the modeling work carried out for 2.5” warm-bent tight-radius feeder bends using LS-DYNA®. The warm-bending process was divided into heating, bending, springback and cooling stages. The simulation results were compared to the measurement data using the neutron diffraction technique. Good agreement was achieved between the trends of simulation results and the measured residual stresses in feeder bends. Additionally, it was found that the predicted cross-sectional shape and wall thickness distribution agreed well with the measurements. Limitations of the simulation work were summarized and recommendations for future research were made based on this study.

Copyright © 2008 by Atomic Energy of Canada Ltd.
Topics: Stress , Modeling

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