NDLI: Effects of Hydrided Region Overload on Delayed Hydride Cracking Initiation From Flaws in Zr-2.5 Nb Pressure Tubes

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Gordon, K. Shek Cui, Jun
Copyright Year	2003
Abstract	The Zr-2.5 Nb pressure tubes of CANDU™ (CANada Deuterium Uranium) reactors are susceptible to a crack initiation and growth mechanism known as Delayed Hydride Cracking (DHC), which is a process that involves hydrogen diffusion, hydride precipitation, hydrided region formation and fracture at a flaw-tip. An overload occurs when the hydrided region at a flaw is loaded to a stress higher than that at which this region is formed. Flaw disposition requires justification that the hydrided region overload from normal reactor operating and transient loading conditions will not fracture the hydrided region, and will not initiate DHC. To evaluate the effects of hydrided region overload on DHC initiation, a series of monotonically increasing load experiments were performed on specimens prepared from unirradiated pressure tube materials with the hydrided region formed at flaws with root radii varying from 15 to 350 μm, and blunt notches with and without secondary flaws. Test results indicate that the resistance to overload fracture is dependent on a variety of parameters including flaw geometry, hydride formation stress, loading history, and overload test temperature.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	117
Ending Page	128
Page Count	12
File Format	PDF
ISBN	0791841537
DOI	10.1115/PVP2003-2015
Volume Number	Application of Fracture Mechanics in Failure Assessment
Conference Proceedings	ASME 2003 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2003-07-20
Publisher Place	Cleveland, Ohio, USA
Access Restriction	Subscribed
Subject Keyword	Geometry Fracture (process) Zirconium Precipitation Temperature Uranium Hydrogen Fracture (materials) Pressure Diffusion (physics) Stress Transients (dynamics)
Content Type	Text
Resource Type	Article

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Delayed Hydride Cracking Initiation at Simulated Secondary Flaws in Zr-2.5 Nb Pressure Tube Material

Overload Fracture of Hydrided Region at Simulated Blunt Flaws in Zr-2.5Nb Pressure Tube Material

Statistical Assessment of Crack Initiation at Simulated Flaws due to Hydrided Region Overload in CANDU Zr-2.5%Nb Pressure Tube Material

Validation of Weight Function Based Process-Zone Model for Evaluation of Delayed Hydride Cracking Initiation in Zr-2.5Nb Pressure Tubes

Effect of Flaw Orientation on Delayed Hydride Crack Initiation in Zr-2.5Nb Pressure Tubes

Statistical Modeling of Resistance to Crack Initiation due to Hydrided Region Overloads at Simulated Flaws in CANDU Pressure Tubes

Effect of Hydrogen Concentration on the Threshold Stress Intensity Factor for Delayed Hydride Cracking in Zr-2.5Nb Pressure Tubes

Effects of Temperature and Thermal Cycling on the Threshold Stress Intensity Factor for Delayed Hydride Cracking in Zr-2.5Nb Pressure Tubes

Modeling stress and temperature history effects on the initiation of hydride cracks at blunt flaws in Zr-2.5%Nb pressure tubes

Effects of Hydrided Region Overload on Delayed Hydride Cracking Initiation From Flaws in Zr-2.5 Nb Pressure Tubes

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