A Study on Dissolution Characteristics of UO2 Pellet in Nitric Acid

질산용액에 UO2 Pellet의 용해특성에 관한 연구

  • Received : 1998.01.09
  • Accepted : 1998.03.21
  • Published : 1998.06.10

Abstract

The effects of surface area of $UO_2$ pellets($s:0.034{\sim}0.282cm^2/g-UO_2$), concentration of nitric acid(1.5~10N) and temperature($40{\sim}105^{\circ}C$) on the dissolution rate were investigated in this experiment. The results showed that dissolution rate of $UO_2$ pellets was in direct proportion to effective surface area(s) and well fit to linear plot in high surface area. The dissolution rate was expressed as dc/dt = 10.6s at $90^{\circ}C$, [$HNO_3$]=8N, and proportioned to the power 1.42 of $HNO_3$ concentration. And also, the results showed that dissolution rate was sharply increased according to temperature increase in temperature below $90^{\circ}C$, but decreased in temperature above $90^{\circ}C$. Activation energy(E) was evaluated to be 36.3KJ/mol.

Keywords

References

  1. J. Nucl. Mater v.138 Mechanism of the Oxidative Dissolution of UO₂ in HNO₃ Solution A. Inoue
  2. AACE/E v.344 Development of Processes for Pilot Plant Production of Purified Uranyl Nitrate Solution P. G. Al Fredson(et al.)
  3. Ind. Eng. Chem v.60 C. Y. Wen
  4. Radiochimia Acta 41 Production Techniques of Fission Molibdenum-99 A. ALi. SAMEH;ACHE. HANS. J
  5. IAEA-TECDOC-515 Fission Molybdenum for Medical Use IAEA
  6. J. Nucl. Sci. and Tech v.32 Effect of Nitrous Acid on Dissolution of UO₂ Powders in Nitric Acid Optimal Conditions for Dissolving UO₂ K. Ikeda(et al.)
  7. J. Appl. Chem v.19 Kinetics of the Dissolution of Uranium Dioxide in Nitric Acid Ⅱ M. Shabbir;R. G. Robins
  8. KAERI/AR-401/94 Mo-99 제조기술 개발현황에 관한 연구 박진호(외)
  9. J. Appl. Chem v.13 F. Taylor(et al.)
  10. J. Appl. Chem v.18 Kinetics of the Dissolution of Uranium Dioxide in Nitric Acid Ⅰ M. Shabbir;R. G. Robins
  11. Acta. Chem. Scand v.8 S. Ahrland(et al.)
  12. AECP-3212 C. A. Blake(et al.)
  13. Uranium Production Technolgy D. H. Charles
  14. J. Nucl. Mater v.224 Kinetic Study on Dissolution of UO₂ Powders in Nitric Acid K. Ikeda(et al.)