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Title: Nanostructure of Metallic Particles in Light Water Reactor Used Nuclear Fuel

Abstract

The extraordinary nano-structure of metallic particles in light water reactor fuels points to possible high reactivity through increased surface area and a high concentration of high energy defect sites. We have analyzed the metallic epsilon particles from a high burn-up fuel from a boiling water reactor using transmission electron microscopy and have observed a much finer nanostructure in these particles than has been reported previously. The individual round particles that varying in size between ~20 and ~50 nm appear to consist of individual crystallites on the order of 2-3 nm in diameter. It is likely that in-reactor irradiation induce displacement cascades results in the formation of the nano-structure. The composition of these metallic phases is variable yet the structure of the material is consistent with the hexagonal close packed structure of epsilon-ruthenium. These findings suggest that unusual catalytic behavior of these materials might be expected, particularly under accident conditions.

Authors:
 [1];  [1];  [1];  [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:
1225137
Report Number(s):
PNNL-SA-101988
Journal ID: ISSN 0022-3115; AF5865010
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Nuclear Materials; Journal Volume: 461
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS

Citation Formats

Buck, Edgar C., Mausolf, Edward J., Mcnamara, Bruce K., Soderquist, Chuck Z., and Schwantes, Jon M. Nanostructure of Metallic Particles in Light Water Reactor Used Nuclear Fuel. United States: N. p., 2015. Web. doi:10.1016/j.jnucmat.2015.03.001.
Buck, Edgar C., Mausolf, Edward J., Mcnamara, Bruce K., Soderquist, Chuck Z., & Schwantes, Jon M. Nanostructure of Metallic Particles in Light Water Reactor Used Nuclear Fuel. United States. doi:10.1016/j.jnucmat.2015.03.001.
Buck, Edgar C., Mausolf, Edward J., Mcnamara, Bruce K., Soderquist, Chuck Z., and Schwantes, Jon M. Wed . "Nanostructure of Metallic Particles in Light Water Reactor Used Nuclear Fuel". United States. doi:10.1016/j.jnucmat.2015.03.001.
@article{osti_1225137,
title = {Nanostructure of Metallic Particles in Light Water Reactor Used Nuclear Fuel},
author = {Buck, Edgar C. and Mausolf, Edward J. and Mcnamara, Bruce K. and Soderquist, Chuck Z. and Schwantes, Jon M.},
abstractNote = {The extraordinary nano-structure of metallic particles in light water reactor fuels points to possible high reactivity through increased surface area and a high concentration of high energy defect sites. We have analyzed the metallic epsilon particles from a high burn-up fuel from a boiling water reactor using transmission electron microscopy and have observed a much finer nanostructure in these particles than has been reported previously. The individual round particles that varying in size between ~20 and ~50 nm appear to consist of individual crystallites on the order of 2-3 nm in diameter. It is likely that in-reactor irradiation induce displacement cascades results in the formation of the nano-structure. The composition of these metallic phases is variable yet the structure of the material is consistent with the hexagonal close packed structure of epsilon-ruthenium. These findings suggest that unusual catalytic behavior of these materials might be expected, particularly under accident conditions.},
doi = {10.1016/j.jnucmat.2015.03.001},
journal = {Journal of Nuclear Materials},
number = ,
volume = 461,
place = {United States},
year = {Wed Mar 11 00:00:00 EDT 2015},
month = {Wed Mar 11 00:00:00 EDT 2015}
}