THERMAL STABILITY TESTING OF GRAPHITE-MATRIX FUEL COMPACTS CONTAINING PYROLYTIC-CARBON COATED CARBIDE PARTICLES WITH COMMENTS ON THE AMOEBA EFFECT

Title: THERMAL STABILITY TESTING OF GRAPHITE-MATRIX FUEL COMPACTS CONTAINING PYROLYTIC-CARBON COATED CARBIDE PARTICLES WITH COMMENTS ON THE AMOEBA EFFECT

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Authors:: Goeddel, W V

Publication Date:: 1961-09-26

Research Org.:: General Atomic Div. General Dynamics Corp., San Diego, Calif.

OSTI Identifier:: 4782877

Report Number(s):: GAMD-2675

NSA Number:: NSA-16-015777

DOE Contract Number:: AT(04-3)-314

Resource Type:: Technical Report

Resource Relation:: Other Information: Orig. Receipt Date: 31-DEC-62

Country of Publication:: United States

Language:: English

Subject:: REACTOR TECHNOLOGY; COATING; COMPACTING; DISPERSIONS; FISSION PRODUCTS; FUELS; GRAPHITE; HEAT TREATMENTS; HIGH TEMPERATURE; LOSSES; MIXING; PARTICLES; PELLETS; PERFORMANCE; REACTORS; STABILITY; TESTING; THORIUM CARBIDES; URANIUM CARBIDES; XENON 133

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                    Goeddel, W V. THERMAL STABILITY TESTING OF GRAPHITE-MATRIX FUEL COMPACTS CONTAINING PYROLYTIC-CARBON COATED CARBIDE PARTICLES WITH COMMENTS ON THE AMOEBA EFFECT.  United States: N. p., 1961. 
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                    Goeddel, W V. THERMAL STABILITY TESTING OF GRAPHITE-MATRIX FUEL COMPACTS CONTAINING PYROLYTIC-CARBON COATED CARBIDE PARTICLES WITH COMMENTS ON THE AMOEBA EFFECT.  United States.

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                    Goeddel, W V. Tue .  
        "THERMAL STABILITY TESTING OF GRAPHITE-MATRIX FUEL COMPACTS CONTAINING PYROLYTIC-CARBON COATED CARBIDE PARTICLES WITH COMMENTS ON THE AMOEBA EFFECT".  United States.

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@article{osti_4782877,

  title        = {THERMAL STABILITY TESTING OF GRAPHITE-MATRIX FUEL COMPACTS CONTAINING PYROLYTIC-CARBON COATED CARBIDE PARTICLES WITH COMMENTS ON THE AMOEBA EFFECT},

  author       = {Goeddel, W V},

  abstractNote = {},

  doi          = {},

  url          = {https://www.osti.gov/biblio/4782877},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1961},

  month        = {9}

}

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PYROLYTIC-CARBON-COATED CARBIDE FUEL PARTICLES AND THEIR USE IN GRAPHITE- MATRIX FUEL COMPACTS

Technical Report Goeddel, W.V. ed.

A summary of the development and evaluation of pyrolytic-carbon-coated carbide fuel particles and graphitematrix fuel compacts is presented. A process that was developed for the preparation of particles of thorium-uranium dicarbide is described. Granulated particles composed of powdered UO/sub 2/, ThO/sub 2/, and carbon are suspended in a bed of graphite flour and heated to convert the oxides to dicarbides. The particles are then melted to densify and spheroidize them, while the graphite flour keeps them separated so they will not flow together. Coating the (Th, U)C/sub 2/ particles with pyrolytic carbon is accomplished in a fluidizedbed apparatus using amore »« less
THERMAL STABILITY STUDIES OF GRAPHITE-MATRIX FUEL SYSTEMS. UNCOATED URANIUM-THORIUM CARBIDE FUEL AND PYROLYTIC-CARBON-COATED CARBIDE FUEL

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The thermal stability of graphite-matrix fuel systems containing both uncoated and pyrolytic-carbon-coated carbide fuel particles was evaluated in the temperature range of 1400 to 2000 deg C and for times of up to one year. No gross migration of uranium or thorium within the compacts was observed. Preferential vaporization of carbon from the surface of compacts was noted. Failure of some of the coated particles in thermal-gradient tests was found to be caused by the movement of the particle through the coating on the high- temperature side; this was named the amoeba effect.'' Tests at temperatures of 1500 deg Cmore »« less
PROCEDURES FOR THE PREPARATION OF GRAPHITE MATRIX FUEL COMPACTS CONTAINING CARBON COATED (Th,U)C$sub 2$ FUEL PARTICLES

Technical Report Goeddel, W V

Details of the warm press fabrication processes are described. It is noted that only 10 wt% of pitch binder is required of which only 5% remains after warm pressing. The resulting product is a high density matrix of 95 vol% graphite and 5 vol% C. (J.R.D.)
PROCEDURES FOR THE PREPARATION OF GRAPHITE MATRIX FUEL COMPACTS CONTAINING CARBON COATED (Th,U)C$sub 2$ FUEL PARTICLES

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Details of fabrication processes for the HTGR fuel compacts are presented. These compacts consist of Th-U dicarbide particles dispersed in a graphite matrix. A 10 wt% pitch binder is used in a warm pressing process to produce a high density matrix of 95 vol% graphite and 5 vol% C. (J.R.D.)
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Results of extensive irradiation testing of graphitematrix fuel compacts are presented. The compacts containing uncoated (Th,U)C/sub 2/ particles were dimensionally stable after burnups of 6.9 x 10/sup 19/ fissions/cm/sup 3/ at 1100 to 1500 un. Concent 85% C. Compacts containing coated particles were tested to burnups of 1.2 x 10/sup 20/ fissions/cm/sup 3/ at temperatures as high as 2000 un. Concent 85% C. A few percent of the particle coatings were found to be broken after these tests. Possible explanations for these failures are presented. (auth)

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