Etude du comportement des gaz de fission dans le dioxyde d'uranium : mécanismes de diffusion, nucléation et grossissement de bulles

Amelie Michel 1
1 LM2C - Laboratoire de Modélisation Multi-échelles des Combustibles
SESC - Service d'Etudes de Simulation du Comportement du combustibles : DEN/DEC/SESC
Abstract : During in-reactor irradiation of the nuclear fuel, fission gases, mainly xenon and krypton, are generated that are subject to several phenomena: diffusion and precipitation. These phenomena can have adverse consequences on the fuel physical and chemical properties and its in-reactor behavior. The purpose of this work is to better understand the behavior of fission gases by identifying diffusion, bubble nucleation and growth mechanisms. To do this, studies involving separate effects have been established coupling ion irradiations/implantations with fine characterizations on Large Scale Facilities. The influence of several parameters such as gas type, concentration and temperature has been identified separately. Interpretation of the Thermal Desorption Spectrometry (TDS) measurements has enabled us to determine xenon and krypton diffusion coefficients in uranium dioxide. A heterogeneous nucleation mechanism on defects was determined by means of experiments on the JANNuS platform in Orsay that consists of a coupling of an implantor, an accelerator and a Transmission Electron Microscope (TEM). Finally, TEM and X-ray Absorption Spectroscopy characterizations of implanted and annealed samples put in relieve a bubble growth mechanism by atoms and vacancies capture.
Complete list of metadatas

Cited literature [5 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00691286
Contributor : Amelie Michel <>
Submitted on : Wednesday, April 25, 2012 - 6:37:34 PM
Last modification on : Monday, February 25, 2019 - 11:02:02 AM
Long-term archiving on: Thursday, July 26, 2012 - 2:42:34 AM

Identifiers

  • HAL Id : tel-00691286, version 1

Collections

Citation

Amelie Michel. Etude du comportement des gaz de fission dans le dioxyde d'uranium : mécanismes de diffusion, nucléation et grossissement de bulles. Science des matériaux [cond-mat.mtrl-sci]. Université de Caen, 2011. Français. ⟨tel-00691286⟩

Share

Metrics

Record views

492

Files downloads

1924