Effect of UO2+x Powders Produced at Different Oxidation Temperatures on the Properties of Pellet

  • Yoo, Ho-Sik (Fuel Technology Center, KEPCO Nuclear Fuel Co. LTD) ;
  • Lee, Seung-Jae (Fuel Technology Center, KEPCO Nuclear Fuel Co. LTD) ;
  • Kim, Jae-Ik (Fuel Technology Center, KEPCO Nuclear Fuel Co. LTD) ;
  • Song, Kun-Woo (Korea Atomic Energy Research Institute)
  • Published : 2003.05.01


Characteristics of $UO_{2+x}$ powders oxidized at different temperatures were examined. Pellets were fabricated by adding these oxidation powders and their properties were also investigated. Particle size of the $UO_{2+x}$ powders decreased with increasing oxidation temperature while surface area increased. Only the powders oxidized at 35$0^{\circ}C$ enhanced the strength of green pellet. However, 35$0^{\circ}C$ oxidized powders added pellet had many surface defects. The difference of shrinkage rate between the oxidized and UO$_2$ powders was thought to be the cause of them.


  1. International Symposium on Advanced Ceramics Fabrication, Characteristics and in Pile Performance of Pellets Prepared from Dry Route powder A.Chotard;A.Ledac
  2. FR 2599883-A1 Method of Manufacturing Uranium Oxide base Nuclear Fuel Pellets FBFC patent
  3. Overview of Nuclear Fuel Cycle Engineering I.S.Chang;M.H.Yoon
  4. J. Nucl. Mater. v.88 An X-ray Diffraction Study of the Formation of β-$UO_{2.33}$ on UO₂Pellet Surface in Air at 229 to 275℃ P.Taylor;E.A.Burgess;D.G.Owen
  5. J. Inorg. Nucl. Chem. v.39 Thermal Expansion and Phase Transformations of the U₃$O_{8-Z}$ Phase in Air R.J.Ackermann;A.T.Chang
  6. J. Solid State Chem. v.84 A Neutron Diffraction Study of Anion Clusters in Non stoichiometric Uranium Dioxide A.D.Murry;B.T.M.Willis
  7. J. Appl. Cryst. v.3 The Phase Transition in α-U₃$O_{8}$at 210℃ B.O.Loopstra