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Progressing Zirconium-Alloy Corrosion Models Using Synchrotron XANES

  • Michael MooreheadEmail author
  • Adrien Couet
  • Jing Hu
  • Zhonghou Cai
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

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.

Keywords

XANES C4 Model Zirconium corrosion 

Notes

Acknowledgements

The authors would like to thank those at Westinghouse for providing the samples used in this experiment as well as those at Oxford University and in the MUZIC community. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Michael Moorehead
    • 1
    Email author
  • Adrien Couet
    • 1
  • Jing Hu
    • 2
  • Zhonghou Cai
    • 3
  1. 1.Department of Engineering PhysicsUniversity of Wisconsin-MadisonMadisonUSA
  2. 2.Department of MaterialsUniversity of OxfordOxfordUK
  3. 3.Advanced Photon SourceArgonne National LaboratoryLemontUSA

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