Skip to Main content Skip to Navigation

Propriétés électriques de verres d'intérêt nucléaire

Abstract : The vitrification of high-level nuclear waste is an important step to master in order to ensure their immobilization. Since 2010, a cold crucible induction melter is used in the La Hague plant due to its advantages. This process is based on electromagnetic currents directly induced on the load of the crucible whose walls are water-cooled. Thanks to the thermal gradient established between these cooled walls and the molten glass, a solid glass layer called self-crucible is created which protects the crucible from corrosion effects and acts as an electrical insulator. Due to their complex composition and microstructure, the study of electrical and dielectric properties of nuclear glasses and the understanding of the related phenomena are necessary in order to efficiently master the cold crucible process and the associated thermo-hydraulic simulations.This study is dealing with the description of the electric charge motion phenomena involving the electrical and dielectric properties of the nuclear borosilicate glasses. Relationships between these properties, the composition and the microstructure are also given. These issues are firstly broached through the investigation of two industrial inactive glasses of complex composition thanks to microstructure characterizations and complex impedance measurements in the solid-state. A more detailed description of the phenomena is performed thanks to the characterization of simplified glasses containing 5 oxides (SiO2-B2O3-Na2O-CaO -RuO2 or -MoO3) allowing a better understanding of the charge motion according to the electrical field frequency, the temperature, the composition and the microstructure of the material.
Document type :
Complete list of metadatas
Contributor : Abes Star :  Contact
Submitted on : Thursday, April 18, 2019 - 3:23:10 PM
Last modification on : Thursday, March 5, 2020 - 6:49:48 PM


Version validated by the jury (STAR)


  • HAL Id : tel-02103590, version 1



Dylan Jouglard. Propriétés électriques de verres d'intérêt nucléaire. Autre. Université d'Orléans, 2018. Français. ⟨NNT : 2018ORLE2036⟩. ⟨tel-02103590⟩



Record views


Files downloads