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Title: Hydride precipitation kinetics in Zircaloy-4 studied using synchrotron X-ray diffraction

Abstract

As a result of in-reactor corrosion during operation in nuclear reactors, hydrogen can enter the zirconium fuel cladding and precipitate as brittle hydride particles, which may reduce cladding ductility. Dissolved hydrogen responds to temperature gradients, resulting in transport and precipitation into cold spots so that the distribution of hydrides in the cladding is inhomogeneous. The hydrogen precipitation kinetics plays a strong role in the spatial distribution of the hydrides in the cladding. The precipitation rate is normally described as proportional to the supersaturation of hydrogen in solid solution. The proportionality constant, α2, for hydride precipitation in Zircaloy-4 is measured directly using in situ synchrotron X-Ray diffraction, at different temperatures and with three different initial hydrogen concentrations. The results validate the linear approximation of the phenomenological model and a near constant value of α2 = 4.5 × 10 -4 s -1 was determined for the temperature range studied.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy - Nuclear Energy University Programs (NEUP); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1239572
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 461; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Courty, Olivier Fabrice, Motta, Arthur T., Piotrowski, Christopher J., and Almer, Jonathan D. Hydride precipitation kinetics in Zircaloy-4 studied using synchrotron X-ray diffraction. United States: N. p., 2015. Web. doi:10.1016/j.jnucmat.2015.02.035.
Courty, Olivier Fabrice, Motta, Arthur T., Piotrowski, Christopher J., & Almer, Jonathan D. Hydride precipitation kinetics in Zircaloy-4 studied using synchrotron X-ray diffraction. United States. https://doi.org/10.1016/j.jnucmat.2015.02.035
Courty, Olivier Fabrice, Motta, Arthur T., Piotrowski, Christopher J., and Almer, Jonathan D. Thu . "Hydride precipitation kinetics in Zircaloy-4 studied using synchrotron X-ray diffraction". United States. https://doi.org/10.1016/j.jnucmat.2015.02.035.
@article{osti_1239572,
title = {Hydride precipitation kinetics in Zircaloy-4 studied using synchrotron X-ray diffraction},
author = {Courty, Olivier Fabrice and Motta, Arthur T. and Piotrowski, Christopher J. and Almer, Jonathan D.},
abstractNote = {As a result of in-reactor corrosion during operation in nuclear reactors, hydrogen can enter the zirconium fuel cladding and precipitate as brittle hydride particles, which may reduce cladding ductility. Dissolved hydrogen responds to temperature gradients, resulting in transport and precipitation into cold spots so that the distribution of hydrides in the cladding is inhomogeneous. The hydrogen precipitation kinetics plays a strong role in the spatial distribution of the hydrides in the cladding. The precipitation rate is normally described as proportional to the supersaturation of hydrogen in solid solution. The proportionality constant, α2, for hydride precipitation in Zircaloy-4 is measured directly using in situ synchrotron X-Ray diffraction, at different temperatures and with three different initial hydrogen concentrations. The results validate the linear approximation of the phenomenological model and a near constant value of α2 = 4.5 × 10-4 s-1 was determined for the temperature range studied.},
doi = {10.1016/j.jnucmat.2015.02.035},
url = {https://www.osti.gov/biblio/1239572}, journal = {Journal of Nuclear Materials},
issn = {0022-3115},
number = ,
volume = 461,
place = {United States},
year = {2015},
month = {1}
}