Issue |
EPJ Web Conf.
Volume 253, 2021
ANIMMA 2021 – Advancements in Nuclear Instrumentation Measurement Methods and their Applications
|
|
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Article Number | 07005 | |
Number of page(s) | 5 | |
Section | Nuclear Fuel Cycle, Safeguards and Homeland Security | |
DOI | https://doi.org/10.1051/epjconf/202125307005 | |
Published online | 19 November 2021 |
https://doi.org/10.1051/epjconf/202125307005
Development of UO2 thermal diffusivity measurement with laser techniques
1
CEA, DES, IRESNE, DEC, Cadarache F-13108 Saint-Paul-lez-Durance, France
2
Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
Published online: 19 November 2021
The knowledge of the thermal conductivity of nuclear fuel and its evolution as a function of temperature and burn up is a major challenge in the context of the evaluation and understanding of irradiated fuel performances in current reactors. It is also the case for the development and qualification of fuel for future reactors. Indeed, numerical simulations of the fuel behaviour under various conditions require the accurate knowledge of thermal conductivity over a wide range of temperature (from ambient to melting point temperature) but also at the scale of few tens of micrometres to take into account the microstructural effects on the thermomechanical evolution of the fuel in normal or incidental irradiation conditions. Different methods, using laser matter interactions, can deduce the thermal conductivity from a thermal diffusivity measurement. In this paper, the potential of two techniques, which present spatial resolution from millimetre to few tens microns, are discussed in the context of the determination of the fuel thermal conductivity: laser flash method and infrared microscopy. Experiments on graphite, as material model, have been conducted and validate these two thermal diffusivity measurement techniques. We present a measurement example for both methods on graphite and then a first experiment carried out with the infrared microscopy technique on UO2.
Key words: UO2 / thermal diffusivity measurements / laser
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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