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Title: Progressing Zirconium-Alloy Corrosion Models Using Synchrotron XANES

Abstract

The corrosion and hydrogen pickup of in-reactor zirconium-based cladding is currently limiting the maximum fuel burnup in light-water reactors. Since the oxidation rate and hydrogen pickup fraction of zirconium alloys vary significantly as a function of exposure time, burnup, and alloy composition, it is critical to better understand the underlying mechanisms to model and predict corrosion behavior. Following the analysis of ~500 autoclave coupons, a physically based zirconium-alloy corrosion model founded on first principles, named “Coupled Current Charge Compensation (C4)”, has been developed. The model reproduces the differences in oxidation kinetics and hydrogen pickup between different zirconium alloys, such as Zr-Nb and Zircaloy-4. Since oxidized solute elements affect the corrosion process through a space-charge compensation mechanism, synchrotron nano-beam X-ray Absorption Near-Edge Spectroscopy has been performed on multiple oxidized Zr-Nb alloys to determine the oxidation-state profile of niobium in the oxide layer. The results inform the C4 model and the associated hydrogen pickup fraction.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1481778
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: 18th International Conference on Environmental degradation of Materials in Nuclear Power Systems – Water Reactors, 08/13/17 - 08/17/17, Portland, OR, US
Country of Publication:
United States
Language:
English
Subject:
C4 Model; XANES; zirconium corrosion

Citation Formats

Moorehead, Michael, Couet, Adrian, Hu, Jing, and Cai, Zhonghou. Progressing Zirconium-Alloy Corrosion Models Using Synchrotron XANES. United States: N. p., 2017. Web. doi:10.1007/978-3-319-68454-3_44.
Moorehead, Michael, Couet, Adrian, Hu, Jing, & Cai, Zhonghou. Progressing Zirconium-Alloy Corrosion Models Using Synchrotron XANES. United States. doi:10.1007/978-3-319-68454-3_44.
Moorehead, Michael, Couet, Adrian, Hu, Jing, and Cai, Zhonghou. Sat . "Progressing Zirconium-Alloy Corrosion Models Using Synchrotron XANES". United States. doi:10.1007/978-3-319-68454-3_44. https://www.osti.gov/servlets/purl/1481778.
@article{osti_1481778,
title = {Progressing Zirconium-Alloy Corrosion Models Using Synchrotron XANES},
author = {Moorehead, Michael and Couet, Adrian and Hu, Jing and Cai, Zhonghou},
abstractNote = {The corrosion and hydrogen pickup of in-reactor zirconium-based cladding is currently limiting the maximum fuel burnup in light-water reactors. Since the oxidation rate and hydrogen pickup fraction of zirconium alloys vary significantly as a function of exposure time, burnup, and alloy composition, it is critical to better understand the underlying mechanisms to model and predict corrosion behavior. Following the analysis of ~500 autoclave coupons, a physically based zirconium-alloy corrosion model founded on first principles, named “Coupled Current Charge Compensation (C4)”, has been developed. The model reproduces the differences in oxidation kinetics and hydrogen pickup between different zirconium alloys, such as Zr-Nb and Zircaloy-4. Since oxidized solute elements affect the corrosion process through a space-charge compensation mechanism, synchrotron nano-beam X-ray Absorption Near-Edge Spectroscopy has been performed on multiple oxidized Zr-Nb alloys to determine the oxidation-state profile of niobium in the oxide layer. The results inform the C4 model and the associated hydrogen pickup fraction.},
doi = {10.1007/978-3-319-68454-3_44},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {10}
}

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Works referenced in this record:

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