Actions for Models for the configuration and integrity of partially oxidized fuel rod cladding at high temperatures -- Final Design Report [electronic resource].

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Models for the configuration and integrity of partially oxidized fuel rod cladding at high temperatures -- Final Design Report [electronic resource].

Published
Idaho Falls, Idaho : Idaho National Engineering and Environmental Laboratory, 1999.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
2,316 Kilobytes pages : digital, PDF file
Additional Creators
Idaho National Engineering and Environmental Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Models were designed to resolve deficiencies in the SCDAP/RELAP5/MOD3.2 calculations of the configuration and integrity of hot, partially oxidized cladding. The modeling was improved in five areas. First, the configuration defined for melted metallic cladding retained by an adjacent oxide layer was improved. Second, the empirical model to account for the effect on oxidation of intact cladding is not significantly reduced by the presence of a rather high concentration of relocated material. Third, models for the dissolution of the oxide layer by the metallic layer were implemented into the code. Fourth, a model was added to calculate the thermal stress applied to the oxide layer by the temperature gradient across the oxide layer and to compare this stress to the ultimate strength of the oxide layer. Fifth, a new rule based on theoretical and experimental results was established for identifying the regions of a fuel rod with oxidation of both the inside and outside surfaces of the cladding. The assessment of these models and their integration into SCDAP/RELAP5 showed that the calculated axial distribution in cladding oxidation and relocation are in significantly better agreement with experimental results than is currently the case. The modeling changes account for three aspects of behavior that were not previously calculated correctly. The implementation of these models eliminates to a significant extent the tendency of the SCDAP/RELAP5 code to overpredict the extent of oxidation of the upper part of fuel rods and to underpredict the extent of oxidation of the lower part of fuel rods and the part with a high concentration of relocated material.
Report Numbers
E 1.99:ineel/ext--99-00107
ineel/ext--99-00107
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
01/01/1999.
"ineel/ext--99-00107"
Siefken, L.J.
N/A (US)
Type of Report and Period Covered Note
Final; 01/01/1999 - 01/01/1999
Funding Information
AC07-94ID13223
View MARC record | catkey: 14356368