Developments in Flaw Evaluation for CANDU Reactor Zr-Nb Pressure Tubes

[+] Author and Article Information
Douglas A. Scarth

Kinectrics, Inc., Toronto, Ontario, Canadae-mail: doug.scarth@kinectrics.com

Ted Smith

Manchester University-UMIST, Materials Science Centre, Manchester, U.K.

J. Pressure Vessel Technol 123(1), 41-48 (Oct 23, 2000) (8 pages) doi:10.1115/1.1339978 History: Received October 18, 2000; Revised October 23, 2000
Copyright © 2001 by ASME
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Blunt flaw DHC initiation acceptance criteria used in fitness-for-service evaluations
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Hydrided regions at a notch root in a Zr-2.5Nb DHC initiation test specimen (magnification is 150×)
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Process zone emanating from a flaw root
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Various pH versus νT behavior as a hydrided region develops at a flaw root
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Model of blunt semi-elliptical flaw with associated process zone in surface of semi-infinite solid
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Illustration of method of superposition for developing the engineering process-zone model
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Notch-tip elastic stress distribution and cubic fit for a/t=0.25 and a/ρ=1.0
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Comparison of predicted threshold peak stress for DHC initiation from engineering process-zone model with experiment
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Predicted threshold peak stress for DHC initiation from engineering process-zone model for applied membrane stress
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Predicted effect of semi-circular flaw depth on nominal applied membrane stress for DHC initiation



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