An ASME Section III Task Group (TG) was formed in 2012 to develop alternate rules for the design assessment of Section III Class 1 nuclear components subject to fatigue service with environmental effects. A Section III Code Case has been proposed with the purpose of providing a method for performing fatigue evaluations of Class 1 components when the effects of a light water reactor environment on fatigue life are judged to be significant and cumulative usage factor (CUF) limits may not be satisfied. The Code Case implements a flaw tolerance approach by postulating that a fatigue crack initiates at the beginning of life and is subjected to fatigue crack growth under the specified design cycles. It must be demonstrated that the crack would remain stable with set margin throughout the design life of the component or part under consideration, and would remain confined to an acceptable fraction of the wall thickness. At this time, the application is limited to type 304/304L and 316/316L austenitic steel. This paper discusses the methodology and technical background of the proposed Code Case.
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ASME 2015 Pressure Vessels and Piping Conference
July 19–23, 2015
Boston, Massachusetts, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5692-5
PROCEEDINGS PAPER
Fatigue Evaluation for Section III, Class 1 Components Using Flaw Tolerance Method to Consider Environmental Effects
David Roarty,
David Roarty
Westinghouse Electric Company, Cranberry Township, PA
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Wolf Reinhardt,
Wolf Reinhardt
Candu Energy Inc., Mississauga, ON, Canada
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David Dewees
David Dewees
The Babcock & Wilcox Company, Barberton, OH
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David Roarty
Westinghouse Electric Company, Cranberry Township, PA
Wolf Reinhardt
Candu Energy Inc., Mississauga, ON, Canada
David Dewees
The Babcock & Wilcox Company, Barberton, OH
Paper No:
PVP2015-45888, V01AT01A048; 9 pages
Published Online:
November 19, 2015
Citation
Roarty, D, Reinhardt, W, & Dewees, D. "Fatigue Evaluation for Section III, Class 1 Components Using Flaw Tolerance Method to Consider Environmental Effects." Proceedings of the ASME 2015 Pressure Vessels and Piping Conference. Volume 1A: Codes and Standards. Boston, Massachusetts, USA. July 19–23, 2015. V01AT01A048. ASME. https://doi.org/10.1115/PVP2015-45888
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