Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
권호 표지

Sintering of a Mixture of $UO_2$ and $Gd_2 O_3$ Powders Doped With $Cr_2 O_3-SiO_2$

  • Published : 2001.08.01
Download PDF
⟨ Previous Next ⟩

Abstract

Mixtures Of AUC-UO$_2$and Gd$_2$O$_3$ Powders doped With Cr$_2$O$_3$ or Cr$_2$O$_3$-SiO$_2$ were Pressed and sintered at 1730 t in hydrogen gas witk various water-vapor contents. The density of UO$_2$- 6wt% Gd$_2$O$_3$ pellets can be increased from 91% TD to 94.5% TD in 1 vol% $H_2O$-H$_2$ gases by the addition of 0.02wt% Cr$_2$O$_3$-(0.01~0.04) wt% SiO$_2$. The magnitude of density increase is much larger in (1~3 vol%) $H_2O$-H$_2$ gases than in 0.05 vol% $H_2O$-H$_2$ gas. The densification of U0$_2$- Gd$_2$O$_3$ compact is significantly delayed in the temperature range between 1300 and 1500 t , but that of compacts with Cr$_2$O$_3$-SiO$_2$ is not. The role of Cr$_2$O$_3$ and SiO$_2$ in densification is discussed.

Keywords

References

  1. H. Assmann and J.P. Robin, 'Guidebook on Quality Control of Mixed Oxides and Gadolinium Bearing Fuels for Light Water Reactors,' p. 51-65, IAEA-TECDOC-584, IAEA, Vienna (1983)
  2. H.H. Davis, and R.A. Potter, '$UO_2-Gd_2O_3$ sintering behavior,' Mater. Sci. Res. 11, 515 (1974)
  3. H.G. Riella, M. Durazzo, M. Hirata and R.A. Nogueira, '$UO_2-Gd_2O_3$ solid solution from wet and dry processes,' J. Nucl. Mater. 178, 204 (1991) https://doi.org/10.1016/0022-3115(91)90387-M
  4. S.M. Ho, and K.C. Radfod, 'Structural chemistry of solid solutions in the $UO_2-Gd_2O_3$ systems,' Nucl. Tech. 73, 350 (1986)
  5. R. Yuda, and K. Une, 'Effect of sintering atmosphere on the densification of $UO_2-Gd_2O_3$ compacts,' J. Nucl. Mater. 178, 195 (1991) https://doi.org/10.1016/0022-3115(91)90386-L
  6. K.W. Song, K.S. Kim, Y.S. Yoo and Y.H. Jung, 'Effect of $UO_2$ powder property and oxygen potential on sintering characteristics of $UO_2-Gd_2O_3$ fuel,' J. Korean Nucl. Soc. 30, 128 (1998)
  7. H. Assmann, M. Peehs and H. Roepenack, 'Survey of binary oxide fuel manufacturing and quality control,' J. Nucl. Mater. 153, 115 (1988) https://doi.org/10.1016/0022-3115(88)90202-4
  8. K.W. Kang, K.S. Kim, K.W. Song, J.H. Yang, and Y.H. Jung, 'Effect of $TiO_2$ and {Al(OH)}_3$ on Sintering Behavior of $UO_2-Gd_2O_3$ Fuel Pellets,' J. Korean Nucl. Soc. 32,(2000)
  9. E. Brandau and W. Doerr, 'Characteristics of $UO_2$ Powder and Pellets for LWR fuel,' Trans. ANS. 31,148 (1979)
  10. HSC Chemistry for Windows, Outokump Research, (1994)
  11. R. Manzel and W.O. Doerr, 'Manufacturing and Irradiation Experience with $UO_2-Gd_2O_3$ Fuel,' Am. Ceram. Soc. Bull. 59, 601 (1980)
  12. K.W. Song, K.S. Kim, J.H. Yang, J. Nucl. Mater. (accepted)
  13. R.S. Roth, J.R. Dennis and H.F. McMurdie, Phase Diagrams for Ceramists, American Ceramic Society, (1975)
  14. Hj, Matzke, 'Diffusion in Nonstoichiometric Oxides' in: Nonstoichiometric Oxides, O.T. Sorensen (ed), p.156, Academic Press, (1981)
  15. O. Muller and R. Roy, The major Ternary Structural Families, Springer-Verlag Berlin, 5-7, (1974)