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Performance of CVR Coatings for PBR Fuels

  • Jay W. Adams (a1), R. E. Barletta (a1), J. Svandrlik (a1) and P. E. Vanier (a1)

Abstract

As a part of the component development process for the particle bed reactor (PBR), it is necessary to develop coatings for fuel particles which will be time and temperature stable. These coatings must not only protect the particle from attack by the hydrogen coolant, but must also help to maintain the bed in a coolable geometry and mitigate against fission product release. In order to develop these advanced coatings, a process to produce chemical vapor reaction (CVR) coatings on fuel for PBRs has been developed.

The initial screening tests for these coatings consisted of testing in flowing hot hydrogen at one atmosphere. Surrogate fuel particles consisting of pyrolytic graphite coated graphite particles have been heated in flowing hydrogen at constant temperature. The carbon loss from these particles was measured as a function of time. Exposure temperatures ranging from 2500 to 3000 K were used and samples were exposed for up to 14 minutes in a cyclical fashion, cooling to room temperature between exposures. The rate of weight loss measured as a function of time is compared to that from other tests of coated materials under similar conditions. Microscopic examination of the coatings before and after exposure was also conducted and these results are presented.

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References

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1. Barletta, R. E., Vanier, P. E., Dowell, M. B. and Lennartz, J. A., “The Development of CVR Coatings for PBR Fuels”, in Covalent Ceramics II: Non-Oxides, editied by Barron, A. R. (Mat. Res. Soc. Proc. 327, Pittsburgh, PA, 1994).
2. Barletta, R. E., Vanier, P. E., Adams, J. W. and Svandrlik, J. F., “Carbon Erosion in Hydrogen - The “Midband” Problem Revisited”, Tenth Symposium on Space Nuclear Power and Propulsion, M. S. El-Genk and Hoover, M. D., eds., AIP Conference Proceedings 271, CONF930103,1993, p 245.
3. Dowell, M., Advanced Ceramics Corporation, private communication.
4. Adams, J. W., Barletta, R. E., Svandrlik, J. and P. E., , , Vanier, “Performance of CVD and CVR Coated Carbon-Carbon in High Temperature Hydrogen”, in Covalent Ceramics II: Non-Oxides, editied by Barron, A. R. (Mat. Res. Soc. Proc. 327, Pittsburgh, PA, 1994).
5. Barletta, R. E., P. E., , , Vanier, J. W., , , Adams, Svandrlik, J. F. and Powell, J. R., “Performance of Carbon Based Hot Frit Substrates. 2. Coating Performance Studies in Hydrogen at Atmospheric Pressure”, BNL Informal Report, BNL-49385, 1993.
6. Clarke, J. T. and Fox, R. R., J. Chem. Phys., 46, 827 (1967).

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