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Title: Rover fuel element development activities: July-September 1970

Abstract

Experimental studies designed to fabricate NERVA fuel elements capable of operating up to 600 minutes at exit gas temperatures of 4400/degree/R have continued. A variety of raw materials are being investigated in an endeavor to achieve these goals. The studies include carbon precursor materials, coating of metal carbide films, and analysis of impurities in the matrix and coated bores. Accomplishments include the following: procedures were established for the manufacture of 450 pounds of cinnamylideneindene (CAI); potassium impurity in CAI was found to cause grass changes in the microstructure of the carbonized material; the coefficient of thermal expansion of molded CAI carbon is the highest obtained to date; elements were extruded with low-fired Poco and low-fired ITX carbons. Physical properties are not yet available; thermal stress studies show that major improvements in the thermal stress resistance can be obtained; the pilot plant ten-element, gas impregnation furnace (pulse vacuum) was operated; uranium beads made using ion exchange resins were heat treated to +2800/degree/C without failure; the CTE value of vapor-deposited tubes of NbC were determined under different processing conditions. 9 refs., 47 figs., 38 tabs.

Authors:
;
Publication Date:
Research Org.:
Oak Ridge Y-12 Plant, TN (USA)
OSTI Identifier:
7083790
Report Number(s):
Y-DA-3940
ON: DE88012655
DOE Contract Number:  
AC05-84OS21400
Resource Type:
Technical Report
Resource Relation:
Other Information: Declassified 26 Mar 1974
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; FUEL ELEMENTS; FABRICATION; NERVA REACTOR; CARBON; EXTRUSION; GRAPHITE; MICROSTRUCTURE; NIOBIUM CARBIDES; PROGRESS REPORT; THERMAL EXPANSION; CARBIDES; CARBON COMPOUNDS; CRYSTAL STRUCTURE; DOCUMENT TYPES; ELEMENTAL MINERALS; ELEMENTS; EXPANSION; GAS COOLED REACTORS; HYDROGEN COOLED REACTORS; MATERIALS WORKING; MINERALS; MOBILE REACTORS; NIOBIUM COMPOUNDS; NONMETALS; POWER REACTORS; PROPULSION REACTORS; REACTOR COMPONENTS; REACTORS; REFRACTORY METAL COMPOUNDS; SPACE POWER REACTORS; SPACE PROPULSION REACTORS; TRANSITION ELEMENT COMPOUNDS; NESDPS Office of Nuclear Energy Space and Defense Power Systems; 220800* - Nuclear Reactor Technology- Propulsion Reactors; 050700 - Nuclear Fuels- Fuels Production & Properties

Citation Formats

Napier, J M, and Marrow, G B. Rover fuel element development activities: July-September 1970. United States: N. p., 1970. Web.
Napier, J M, & Marrow, G B. Rover fuel element development activities: July-September 1970. United States.
Napier, J M, and Marrow, G B. Wed . "Rover fuel element development activities: July-September 1970". United States.
@article{osti_7083790,
title = {Rover fuel element development activities: July-September 1970},
author = {Napier, J M and Marrow, G B},
abstractNote = {Experimental studies designed to fabricate NERVA fuel elements capable of operating up to 600 minutes at exit gas temperatures of 4400/degree/R have continued. A variety of raw materials are being investigated in an endeavor to achieve these goals. The studies include carbon precursor materials, coating of metal carbide films, and analysis of impurities in the matrix and coated bores. Accomplishments include the following: procedures were established for the manufacture of 450 pounds of cinnamylideneindene (CAI); potassium impurity in CAI was found to cause grass changes in the microstructure of the carbonized material; the coefficient of thermal expansion of molded CAI carbon is the highest obtained to date; elements were extruded with low-fired Poco and low-fired ITX carbons. Physical properties are not yet available; thermal stress studies show that major improvements in the thermal stress resistance can be obtained; the pilot plant ten-element, gas impregnation furnace (pulse vacuum) was operated; uranium beads made using ion exchange resins were heat treated to +2800/degree/C without failure; the CTE value of vapor-deposited tubes of NbC were determined under different processing conditions. 9 refs., 47 figs., 38 tabs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1970},
month = {11}
}

Technical Report:
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