NuFuel & MMSNF 2015

First Workshop on Research into Nuclear Fuel in Europe
and Materials Modeling and Simulation for Nuclear Fuels Workshop
Karlsruhe, Germany, November 16th to 18th, 2015

Updated: Tue 08 Dec 2015, 14:27

Talk 5.3: Xe diffusion and bubble nucleation around edge dislocations in UO2

Samuel T. Murphy, Paul C. M. Fossati,, Robin W. Grimes
  • Department of Materials and Centre for Nuclear Engineering, Imperial College London, London. SW7 2AZ.


As the primary phenomenon involved in plasticity, dislocation behaviour is of highest importance to describe creep mechanisms in UO2 nuclear fuel.

In particular, in high burnup fuels, dislocations interact with various radiation-induced defects such as voids, bubbles and intrinsic point defects.

In this study, we focus on the interaction of dislocations with fission gas bubbles. Whilst previous work have shown the role of dislocations in the formation of xenon bubbles[1], little is known about the effect of those bubbles on dislocation mobility once they have formed.

In UO2 the most active slip systems are {100}, {110} and {111}. The three dislocation types have been simulated interacting with xenon bubbles. The critical stresses of such systems have been calculated depending on bubble size and density. We also describe the effect of dislocations on bubble properties.

  1. S. T. Murphy, P. C. M. Fossati and R. W. Grimes, J. Nucl. Mater. (2015).