Thèse Modélisation de la vitrification de déchets de haute activité en creuset froid en alimentation liquide

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The vitrification of high level liquid waste (HLLW) resulting from the reprocessing of spent fuel is carried out, in part, in a furnace known as an inductive cold crucible melter at 1200 ° C. The waste initially in liquid form is introduced into the oven after a drying and calcination step.

The work of this thesis is part of studies aiming to feed the waste in the furnace directly in liquid form. The objective is to be able to simulate the mixture between molten glass and liquid waste at the surface from the point of view of fluid mechanics, thermal and chemical engineering.

Initially, it will be a question of developing a modeling of the transformation of the material fed in liquid form into glass by adapting an approach already developed by American research teams [1-2] for ceramic furnaces.

This modeling will be integrated into the magneto-thermo-hydraulic simulations of the processes already developed in the laboratory [3]. Comparisons between simulations and prototype experiments at a 1: 1 scale inactive, as well as discussions with American research teams are planned.

1- Chun, J .; Pierce, D. A .; Pokorny, R. & Hrma, P .; Cold-cap reactions in vitrification of nuclear waste glass: Experiments and modeling; Thermochimica Acta, 2013, 559, 32 – 39

2- Pokorny, R .; Pierce, D. A. & Hrma, P .; Melting of glass batch: Model for multiple overlapping gas-evolving reactions; Thermochimica Acta, 2012, 541, 8 – 14

3- Barba Rossa, PhD thesis, Multiphysics modeling of cold crucible glass production, 2018

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