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Etude de l’interaction laser surface pour le développement de procédé de décontamination de surfaces métalliques avec fissures micrométriques par ablation laser

Luisa Carvalho 1
1 LISL - laboratoire d'ingénierie des surfaces et lasers
SEARS - Service d'études analytiques et de réactivité des surfaces : DEN/DPC/SEARS
Abstract : The preparation of future decommissioning of nuclear installations is currently facing economical and sanitary challenges. The metallic-surface decontamination by laser ablation is here studied as an appropriate and efficient technique, which involves ejection of surface contamination by subjecting the surface to high-energy laser pulses followed by subsequent trapping to avoid environmental dispersion. This process has many advantages such as the minimization of secondary waste, no production of effluents and the reduction of the exposition of workers by the automation of the process. Previous studies highlighted the need to optimize the process in order to limit the residual contamination. The identified reasons for this limitation are the contamination penetration into the metal bulk induced by the laser treatment and the entrapment of the radionuclides in surface defects like micro cracks. The aim of this work is the study and the cleaning optimization of metallic surfaces with an oxide layer implemented with a non-radioactive contamination (Eu). Secondly, the cleaning efficiency has been improved in case of damaged surfaces with defects such as cracks. Beyond an experimental study, The ablation of a metallic substrate with a submicrometric oxide layer is currently modeled using a numerical and multiphysics approach in order to determine the mechanism involved during the process.
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Luisa Carvalho. Etude de l’interaction laser surface pour le développement de procédé de décontamination de surfaces métalliques avec fissures micrométriques par ablation laser. Génie civil nucléaire. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLS462⟩. ⟨tel-01971559⟩

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