The Effect of Hydrogen and Hydrides on the Integrity of Zirconium Alloy Components: Hydride Reorientation

Hydride orientation has an important effect on fracture toughness of hydride-containing zirconium alloys because hydrides form as approximately linear arrays of platelet-shaped microscopic precipitates with habits on or near the basal planes of the α–Zr matrix in which they form.

This Stand Alone Report (SAR) addresses a key aspect of the issues raised in the foregoing by providing a comprehensive, self-contained and up-to-date review and analyses of the results of studies carried out on the conditions governing hydride orientation in zirconium alloy pressure and fuel cladding tubes used in nuclear reactors. The report combines a detailed theoretical and experimental overview of this subject with the author’s own analyses of these results. These analyses make use of theoretical advances documented in the author’s 2012 book dealing with the effects of hydrogen and hydrides on the integrity of zirconium alloy components. In the author’s 2012 book, emphasis is placed on delayed hydride cracking, which is a localised failure mechanism.


Effect of Hydrogen on Zirconium Alloy Performance (Normal Operaton, LOCA/RIA and Dry Storage) – Vol. II

The intent of these two reports is to discuss the basics of hydrogen, hydrides and their effect on the zirconium alloy properties in Volume I and in-pile performance during normal and accident conditions as well as dry storage in Volume II. A better understanding of the mechanisms by which hydrogen/ hydrides impacts zirconium alloy properties and in-pile performance may enable the nuclear industry to find means to reduce the harmful effects of hydrogen/hydrides on the material in-pile performance.