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Thermal Conductivity of UO2–BeO–Gd2O3 Nuclear Fuel Pellets

  • D. M. CamaranoEmail author
  • F. A. Mansur
  • A. M. M. Santos
  • L. S. Ribeiro
  • A. Santos
TEMPMEKO 2019
  • 30 Downloads
Part of the following topical collections:
  1. TEMPMEKO 2019: Selected Papers of the 14th International Symposium on Temperature and Thermal Measurements in Industry and Science

Abstract

In the present paper, the influence of the beryllium oxide addition to increase the thermal conductivity in uranium dioxide fuel pellets containing gadolinium oxide as burnable poison was investigated. Fuel pellets of UO2, UO2–BeO–Gd2O3, and UO2–Gd2O3 were obtained in concentrations of 2–3 wt % of BeO and 6 wt % of Gd2O3. The thermal diffusivity was determined at room temperature and until 773 K by Laser Flash and Thermal Quadrupole methods, respectively. The thermal diffusivity and thermal conductivity were normalized to 95  % TD (theoretical density). The maximum relative expanded uncertainties of the thermal diffusivity and thermal conductivity measurements were estimated to be 7.5  % and 8.0  %, respectively. In addition, the obtained results were compared with the theoretical models and experimental data given in the literature. The results showed an increase in the thermal diffusivity and conductivity of the UO2 pellets with additions of BeO as compared to the values obtained with UO2 and UO2–Gd2O3 pellets.

Keywords

Beryllium oxide Gadolinium oxide Laser flash method Nuclear fuel pellets Thermal conductivity Thermal diffusivity Thermal quadrupole method Uranium dioxide 

Notes

Acknowledgments

The authors thank the financial support of Sistema Brasileiro de Tecnologia (Sibratec-Modernit-SisNANO).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • D. M. Camarano
    • 1
    Email author
  • F. A. Mansur
    • 1
  • A. M. M. Santos
    • 1
  • L. S. Ribeiro
    • 1
  • A. Santos
    • 1
  1. 1.Structural Integrity and Nuclear Materials ServiceCentro de Desenvolvimento da Tecnologia Nuclear, CDTNBelo HorizonteBrazil

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