skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Models for the Configuration and Integrity of Partially Oxidized Fuel Rod Cladding at High Temperatures

Abstract

Models were designed to resolve deficiencies in the SCDAP/RELAP5/MOD3.2 calculations of the configuration and integrity of hot, partially oxidized cladding. These models are expected to improve the calculations of several important aspects of fuel rod behavior. First, an improved mapping was established from a compilation of PIE results from severe fuel damage tests of the configuration of melted metallic cladding that is retained by an oxide layer. The improved mapping accounts for the relocation of melted cladding in the circumferential direction. Then, rules based on PIE results were established for calculating the effect of cladding that has relocated from above on the oxidation and integrity of the lower intact cladding upon which it solidifies. Next, three different methods were identified for calculating the extent of dissolution of the oxidic part of the cladding due to its contact with the metallic part. The extent of dissolution effects the stress and thus the integrity of the oxidic part of the cladding. Then, an empirical equation was presented for calculating the stress in the oxidic part of the cladding and evaluating its integrity based on this calculated stress. This empirical equation replaces the current criterion for loss of integrity which is based onmore » temperature and extent of oxidation. Finally, 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 implementation of these models is expected to eliminate 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. This report is a revision and reissue of the report entitled, Improvements in Modeling of Cladding Oxidation and Meltdown.« less

Authors:
Publication Date:
Research Org.:
Idaho National Engineering and Environmental Lab., Idaho Falls, ID (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
6067
Report Number(s):
INEEL/EXT-98-00661,Rev.1
TRN: US0101706
DOE Contract Number:  
AC07-94ID13223
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Jan 1999
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; DISSOLUTION; FUEL RODS; IMPLEMENTATION; OXIDATION; MATHEMATICAL MODELS; FUEL CANS; S CODES; R CODES; MODIFICATIONS; MELTING; PARTIALLY OXIDIZED CLADDING, CALCULATIONS; FUEL ROD BEHAVIOR; SCDAP/RELAP5/MOD3.2; CLADDING MAPPING; MELTED METALLIC CLADDING; OXIDE LAYER; RELOCATION; MODELING OF CLADDING OXIDATION AND MELTDOWN

Citation Formats

Siefken, L.J. Models for the Configuration and Integrity of Partially Oxidized Fuel Rod Cladding at High Temperatures. United States: N. p., 1999. Web. doi:10.2172/6067.
Siefken, L.J. Models for the Configuration and Integrity of Partially Oxidized Fuel Rod Cladding at High Temperatures. United States. doi:10.2172/6067.
Siefken, L.J. Fri . "Models for the Configuration and Integrity of Partially Oxidized Fuel Rod Cladding at High Temperatures". United States. doi:10.2172/6067. https://www.osti.gov/servlets/purl/6067.
@article{osti_6067,
title = {Models for the Configuration and Integrity of Partially Oxidized Fuel Rod Cladding at High Temperatures},
author = {Siefken, L.J.},
abstractNote = {Models were designed to resolve deficiencies in the SCDAP/RELAP5/MOD3.2 calculations of the configuration and integrity of hot, partially oxidized cladding. These models are expected to improve the calculations of several important aspects of fuel rod behavior. First, an improved mapping was established from a compilation of PIE results from severe fuel damage tests of the configuration of melted metallic cladding that is retained by an oxide layer. The improved mapping accounts for the relocation of melted cladding in the circumferential direction. Then, rules based on PIE results were established for calculating the effect of cladding that has relocated from above on the oxidation and integrity of the lower intact cladding upon which it solidifies. Next, three different methods were identified for calculating the extent of dissolution of the oxidic part of the cladding due to its contact with the metallic part. The extent of dissolution effects the stress and thus the integrity of the oxidic part of the cladding. Then, an empirical equation was presented for calculating the stress in the oxidic part of the cladding and evaluating its integrity based on this calculated stress. This empirical equation replaces the current criterion for loss of integrity which is based on temperature and extent of oxidation. Finally, 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 implementation of these models is expected to eliminate 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. This report is a revision and reissue of the report entitled, Improvements in Modeling of Cladding Oxidation and Meltdown.},
doi = {10.2172/6067},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}

Technical Report:

Save / Share: