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Hydrogen pick-up of zirconium-based fuel cladding and structural materials during in-reactor corrosion can degrade fuel component, as the ingress of hydrogen can lead to the formation of brittle hydrides. In the BWR environment, Zircaloy-2 fuel cladding and structural components such as water rods and channels can experience accelerated hydrogen pick-up, while Zircaloy-4 components exposed to similar conditions do not. Because the principal difference between the two alloys is that Zircaloy-2 contains nickel, accelerated hydrogen pick-up has been hypothesized to result from the presence of nickel. However, an understanding of the mechanism by which this acceleration occurs is still lacking. This research investigates the link between hydrogen pick-up and the oxidation behavior of alloying elements when incorporated into the oxide layers formed on zirconium alloys when corroded in-reactor. In this study, synchrotron radiation microbeam Xray absorption near edge spectroscopy (XANES) at the Advanced Photon Source was performed on carefully selected BWR-corroded Zircaloy-2 water rods at assembly-averaged burn-up ranging from 32.8 to 74.6 GWd/MTU to determine the oxidation states of alloying elements, such as iron and nickel, within the oxide layers, as a function of distance from the oxide-metal interface at high burn-up. Samples were chosen for comparison based on having similar oxide thicknesses, 1 Dept. of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA, 16802, United States of America 2 Electric Power Research Institute, Palo Alto, CA, 94304, United States of America 3 Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, United States of America

Microbeam X-Ray Absorption Near-Edge Spectroscopy of Alloying Elements in the Oxide Layers of Irradiated Zircaloy-2