Microstructure changes and thermal conductivity reduction in UO2 following 3.9 MeV He2+ ion irradiation

J Pakarinen, M Khafizov, L He, C Wetteland… - Journal of Nuclear …, 2014 - Elsevier
The microstructural changes and associated effects on thermal conductivity were examined
in UO 2 after irradiation using 3.9 MeV He 2+ ions. Lattice expansion of UO 2 was observed …

Thermal diffusion of helium in 238Pu-doped UO2

Z Talip, T Wiss, V Di Marcello, A Janssen… - Journal of nuclear …, 2014 - Elsevier
Abstract UO 2 samples doped with 0.1 wt.% plutonium oxide have been investigated with
the aim to study alpha-damage effects and the behaviour of radiogenic helium in spent …

Helium thermal diffusion in a uranium dioxide matrix

D Roudil, X Deschanels, P Trocellier, C Jégou… - Journal of Nuclear …, 2004 - Elsevier
The behavior of helium and its diffusion mechanisms in uranium dioxide significantly impact
the possible evolution of the spent fuel matrix in interim storage or in a disposal repository …

Xenon versus helium behavior in UO2 single crystals: A TEM investigation

G Sattonnay, L Vincent, F Garrido, L Thome - Journal of nuclear materials, 2006 - Elsevier
The behavior of He and Xe implanted into UO2 single crystals is studied by in situ TEM
experiments before and after annealing up to 700° C. TEM micrographs show that annealing …

Thermal conductivity and diffusion mechanisms of noble gases in uranium dioxide: a DFT+ U study

E Torres, TP Kaloni - Journal of Nuclear Materials, 2019 - Elsevier
The bulk properties of uranium dioxide (UO 2) have been investigated using Hubbard
corrected density functional theory (DFT+ U) calculations. Monitoring of the occupation …

Predicted mechanisms for radiation enhanced helium resolution in uranium dioxide

DC Parfitt, RW Grimes - Journal of Nuclear Materials, 2008 - Elsevier
Classical molecular dynamics has been performed to predict the behaviour of helium gas
bubbles in uranium dioxide, UO2, when subjected to displacement cascades that mimic the …

In situ controlled modification of the helium density in single helium-filled nanobubbles

ML David, K Alix, F Pailloux, V Mauchamp… - Journal of Applied …, 2014 - pubs.aip.org
We demonstrate that the helium density and corresponding pressure can be modified in
single nano-scale bubbles embedded in semiconductors by using the electron beam of a …

Specific outcomes of the research on the spent fuel long-term evolution in interim dry storage and deep geological disposal

C Ferry, C Poinssot, C Cappelaere… - Journal of Nuclear …, 2006 - Elsevier
This paper presents an overview of the main results of the French research on the long-term
evolution of spent fuel. The behavior of the spent fuel rods in the various conditions likely to …

He migration in implanted UO2 sintered disks

S Guilbert, T Sauvage, P Garcia, G Carlot… - Journal of Nuclear …, 2004 - Elsevier
The behaviour of helium implanted in sintered uranium dioxide disks has been investigated
as a function of annealing temperature. UO2 disks have been implanted with 1 MeV 3He …

Diffusion of radiogenic helium in natural uranium oxides

D Roudil, J Bonhoure, R Pik, M Cuney, C Jégou… - Journal of Nuclear …, 2008 - Elsevier
The issue of nuclear waste management–and especially spent fuel disposal–demands
further research on the long-term behavior of helium and its impact on physical changes in …