Irradiation effects and micro-structural changes in large grain uranium dioxide fuel investigated by micro-beam X-ray diffraction - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Journal of Nuclear Materials Year : 2014

Irradiation effects and micro-structural changes in large grain uranium dioxide fuel investigated by micro-beam X-ray diffraction

C. Mieszczynski
  • Function : Author
G. Kuri
  • Function : Author
C. Degueldre
  • Function : Author
M. Martin
  • Function : Author
J. Bertsch
  • Function : Author
C.N. Borca
  • Function : Author
D. Grolimund
  • Function : Author
Ch. Delafoy
  • Function : Author

Abstract

Microstructural changes in a set of commercial grade UO2 fuel samples have been investigated using synchrotron based micro-focused X-ray fluorescence (μ-XRF) and X-ray diffraction (μ-XRD) techniques. The results are associated with conventional UO2 materials and relatively larger grain chromia-doped UO2 fuels, irradiated in a commercial light water reactor plant (average burn-up: 40 MW d kg−1). The lattice parameters of UO2 in fresh and irradiated specimens have been measured and compared with theoretical predictions. In the pristine state, the doped fuel has a somewhat smaller lattice parameter than the standard UO2 as a result of chromia doping. Increase in micro-strain and lattice parameter in irradiated materials is highlighted. All irradiated samples behave in a similar manner with UO2 lattice expansion occurring upon irradiation, where any Cr induced effect seems insignificant and accumulated lattice defects prevail. Elastic strain energy densities in the irradiated fuels are also evaluated based on the UO2 crystal lattice strain and non-uniform strain. The μ-XRD patterns further allow the evaluation of the crystalline domain size and sub-grain formation at different locations of the irradiated UO2 pellets.
No file

Dates and versions

in2p3-00957834 , version 1 (11-03-2014)

Identifiers

Cite

C. Mieszczynski, G. Kuri, C. Degueldre, M. Martin, J. Bertsch, et al.. Irradiation effects and micro-structural changes in large grain uranium dioxide fuel investigated by micro-beam X-ray diffraction. Journal of Nuclear Materials, 2014, 444, pp.274-282. ⟨10.1016/j.jnucmat.2013.09.054⟩. ⟨in2p3-00957834⟩
18 View
0 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More