X Rays methods applied to corium material - CEA - Commissariat à l’énergie atomique et aux énergies alternatives
Communication Dans Un Congrès Année : 2024

X Rays methods applied to corium material

Résumé

Due to their intrinsic properties, X-rays are at the basis of several methods of material investigation. In the case of crystals, X-ray scattering and diffraction allow structural and microstructural analysis. Whether the material under consideration is amorphous or crystallized, elemental analysis can be done through the measurement of the energies and intensities of the X-ray emission characteristic lines of the elements constituting a material. The detection of these X-rays emission lines allows local chemical analysis and mapping at the micrometric scale that can be performed by Electron Probe Micro-Analysis (EPMA). The lecture will give an example of the application of X-ray methods for the elementary and structural analysis of the corium, a complex material coming from the melting of the core of nuclear reactor at a very high temperature (2500-2800 K). Studies were carried out on prototypical corium according to the U1-x ZrxO2y solid solution obtained by Fuel Coolant Interaction experiments performed in the KROTOS facility at CEA Cadarache. The fragmented or exploded corium particles typical size of 200 µm or less than 50 µm have been studied to determine their microstructure, elemental composition and structural state. EPMA was used to determine with high accuracy the local variation of the composition. A specific methodology will be presented and results will be compared with the determination of the cationic composition fluctuations determined through coupled Rietveld refinement of X-rays and neutrons diffraction patterns recorded at the MARS beamline at the SOLEIL synchrotron and at the D2B beamline of the Institute Laue Langevin respectively. Moreover, micro texture analyses were performed through SEM/EBSD observations and Laue microdiffraction experiments done on the BM32 beamline at the ESRF synchrotron. We clearly evidenced intra-crystalline local cationic composition fluctuations that we were able to be associated to the different cooling process and the particles sizes.

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Dates et versions

cea-04726610 , version 1 (08-10-2024)

Identifiants

  • HAL Id : cea-04726610 , version 1

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Emmanuelle Brackx, Mohamed Jizzini, Denis Menut, P Piluso, René Guinebretière. X Rays methods applied to corium material. EXRS, EXRS, Jun 2024, Athènes, Greece. ⟨cea-04726610⟩
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