Evolution of extended defects in UO2 during high temperature annealing

Hung, Chang-Yu; Ferrigno, Joshua; Gentile, Robert O.; Khafizov, Marat; He, Lingfeng

doi:10.1016/j.jnucmat.2024.154997

Title: Evolution of extended defects in UO₂ during high temperature annealing

Journal Article · 01 March 2024 · Journal of Nuclear Materials

DOI: https://doi.org/10.1016/j.jnucmat.2024.154997 · OSTI ID:2432419

Hung, Chang-Yu ^[1]; Ferrigno, Joshua ^[2];

^[3];

^[2]; He, Lingfeng ^[4]

Idaho National Laboratory (INL), Idaho Falls, ID (United States); National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
The Ohio State Univ., Columbus, OH (United States)
North Carolina State University, Raleigh, NC (United States)
Idaho National Laboratory (INL), Idaho Falls, ID (United States); North Carolina State University, Raleigh, NC (United States)

The evolution of thermophysical characteristics of uranium oxide (UO₂) under irradiation is a critical aspect of nuclear fuel performance of light water reactors. This study examines the effect of high-temperature annealing at 1000 °C - 1600 °C on defect evolution in krypton irradiated UO₂ at room temperature. Transmission electron microscopy analysis reveals that the size of irradiation-induced bubbles and dislocation loops increases but their density decreases with annealing temperatures. Perfect dislocation loops with = <110> dominate, regardless of the annealing temperature. A rate theory model for extended defect evolution is applied to conclude that current understanding of dynamical loop and bubble evolution at high-temperature annealing is governed by defect coalescence.

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Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 2432419

Report Number(s):: INL/JOU--24-79881-Rev000

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: - Vol. 593; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Evolution of extended defects in UO₂ during high temperature annealing