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Title: Fission recoil-induced microstructural evolution of the fuel-cladding interface [FCI] in high burnup BWR fuel

Abstract

Understanding the structural evolution of nuclear fuel and cladding during operation is essential for predicting performance during and after service in a light water reactor. In this work, we utilized focused ion beam-based preparation techniques to make transmission electron microscopy samples of the cross-section of the fuel-cladding interface oxide region of high burn-up BWR fuel. Using diffraction contrast STEM imaging and precession electron diffraction, we demonstrated that not only does fission product radiation stabilize the tetragonal phase of zirconium oxide at temperatures well below the equilibrium temperature, but it also causes grain growth that is proportional to the fission production radiation damage. The tetragonal phase ZrO 2 was exclusively present only in the region where fission product metal particles were found (~6µm), and then the tetragonal phase was also present, but mixed with monoclinic phase, up to the max depth at which fission product radiation is expected to be reached - ~8µm. Also, the grain size distribution of tetragonal phase was proportional to the integrated damage (excess vacancies generated) profile of the implanted fission product atoms.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1547444
Alternate Identifier(s):
OSTI ID: 1543318
Report Number(s):
PNNL-SA-139875
Journal ID: ISSN 0022-3115
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Published Article
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 521; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; Nuclear Fuel Cladding; Fission Product Radiation; Transmission Electron Microscopy; Precession Electron Diffraction; Fuel-cladding interface; Noble metal phase particles; Tetragonal phase zirconia

Citation Formats

Lach, Timothy G., Edwards, Danny J., Buck, Edgar C., McNamara, Bruce K., Schwantes, Jon M., and Clark, Richard A. Fission recoil-induced microstructural evolution of the fuel-cladding interface [FCI] in high burnup BWR fuel. United States: N. p., 2019. Web. doi:10.1016/j.jnucmat.2019.04.044.
Lach, Timothy G., Edwards, Danny J., Buck, Edgar C., McNamara, Bruce K., Schwantes, Jon M., & Clark, Richard A. Fission recoil-induced microstructural evolution of the fuel-cladding interface [FCI] in high burnup BWR fuel. United States. doi:10.1016/j.jnucmat.2019.04.044.
Lach, Timothy G., Edwards, Danny J., Buck, Edgar C., McNamara, Bruce K., Schwantes, Jon M., and Clark, Richard A. Wed . "Fission recoil-induced microstructural evolution of the fuel-cladding interface [FCI] in high burnup BWR fuel". United States. doi:10.1016/j.jnucmat.2019.04.044.
@article{osti_1547444,
title = {Fission recoil-induced microstructural evolution of the fuel-cladding interface [FCI] in high burnup BWR fuel},
author = {Lach, Timothy G. and Edwards, Danny J. and Buck, Edgar C. and McNamara, Bruce K. and Schwantes, Jon M. and Clark, Richard A.},
abstractNote = {Understanding the structural evolution of nuclear fuel and cladding during operation is essential for predicting performance during and after service in a light water reactor. In this work, we utilized focused ion beam-based preparation techniques to make transmission electron microscopy samples of the cross-section of the fuel-cladding interface oxide region of high burn-up BWR fuel. Using diffraction contrast STEM imaging and precession electron diffraction, we demonstrated that not only does fission product radiation stabilize the tetragonal phase of zirconium oxide at temperatures well below the equilibrium temperature, but it also causes grain growth that is proportional to the fission production radiation damage. The tetragonal phase ZrO2 was exclusively present only in the region where fission product metal particles were found (~6µm), and then the tetragonal phase was also present, but mixed with monoclinic phase, up to the max depth at which fission product radiation is expected to be reached - ~8µm. Also, the grain size distribution of tetragonal phase was proportional to the integrated damage (excess vacancies generated) profile of the implanted fission product atoms.},
doi = {10.1016/j.jnucmat.2019.04.044},
journal = {Journal of Nuclear Materials},
number = C,
volume = 521,
place = {United States},
year = {2019},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.jnucmat.2019.04.044

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