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Title: Grain and burnup dependence of spent fuel oxidation: geological repository impact

Abstract

Further refinements to the oxidation model of Stout et al. have been made. The present model incorporates the burnup dependence of the oxidation rate in addition to an allowance for a distribution of grain sizes. The model was tested by comparing the model results with the oxidation histories of spent fuel samples oxidized in Thermogravimetric Analysis (TGA) or Oven Dry-Bath (ODB) experiments. The comparison between the experimental and model results are remarkably close and confirm the assumption that grain-size distributions and activation energies are the important parameters to predicting oxidation behavior. The burnup dependence of the activation energy was shown to have a greater effect than decreasing the effective grain size in suppressing the rate of the reaction U{sub 4}O{sub 9}(rightwards arrow)U{sub 3} O{sub 4}. Model results predict that U{sub 3}O{sub 8} formation of spent fuels exposed to oxygen will be suppressed even for high burnup fuels that have undergone restructuring in the rim region, provided the repository temperature is kept sufficient.

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
USDOE Office of Civilian Radioactive Waste Management (RW) (US)
OSTI Identifier:
2831
Report Number(s):
UCRL-JC-131592
TRN: US0101336
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Materials Research Society 1998 Fall Meeting, Boston, MA (US), 11/30/1998--12/04/1998; Other Information: PBD: 15 Oct 1998
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; ACTIVATION ENERGY; BURNUP; GRAIN SIZE; OXIDATION; SPENT FUELS; RADIOACTIVE WASTE DISPOSAL; MATHEMATICAL MODELS; URANIUM OXIDES

Citation Formats

Hanson, B D, Kansa, E J, and Stoot, R B. Grain and burnup dependence of spent fuel oxidation: geological repository impact. United States: N. p., 1998. Web. doi:10.2172/291169.
Hanson, B D, Kansa, E J, & Stoot, R B. Grain and burnup dependence of spent fuel oxidation: geological repository impact. United States. doi:10.2172/291169.
Hanson, B D, Kansa, E J, and Stoot, R B. Thu . "Grain and burnup dependence of spent fuel oxidation: geological repository impact". United States. doi:10.2172/291169. https://www.osti.gov/servlets/purl/2831.
@article{osti_2831,
title = {Grain and burnup dependence of spent fuel oxidation: geological repository impact},
author = {Hanson, B D and Kansa, E J and Stoot, R B},
abstractNote = {Further refinements to the oxidation model of Stout et al. have been made. The present model incorporates the burnup dependence of the oxidation rate in addition to an allowance for a distribution of grain sizes. The model was tested by comparing the model results with the oxidation histories of spent fuel samples oxidized in Thermogravimetric Analysis (TGA) or Oven Dry-Bath (ODB) experiments. The comparison between the experimental and model results are remarkably close and confirm the assumption that grain-size distributions and activation energies are the important parameters to predicting oxidation behavior. The burnup dependence of the activation energy was shown to have a greater effect than decreasing the effective grain size in suppressing the rate of the reaction U{sub 4}O{sub 9}(rightwards arrow)U{sub 3} O{sub 4}. Model results predict that U{sub 3}O{sub 8} formation of spent fuels exposed to oxygen will be suppressed even for high burnup fuels that have undergone restructuring in the rim region, provided the repository temperature is kept sufficient.},
doi = {10.2172/291169},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Oct 15 00:00:00 EDT 1998},
month = {Thu Oct 15 00:00:00 EDT 1998}
}

Conference:
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