General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
SL-DES-24-0184
Thesis topic details
Category
Condensed Matter Physics, chemistry, nanosciences
Thesis topics
Model development and simulation of coupling between plume migration and chemical perturbations
Contract
Thèse
Job description
The fate of chemicals in the environment is of importance in fields, including fuel-cycle or radioecology. Migration models describe the behaviour of radionuclides and relationships with properties: e.g. electrical charge, redox state. In addition, the retention on mineral surfaces strongly delays migration. This later mechanism may be described using various approaches and levels of complexity:
- Non-reactive approach, considering retention (Kd) without species chemistry,
- Reactive-transport, considering speciation in solution and on surfaces,
- Multi-component approaches, specifying diffusion for each compounds, e.g. NO3, EDTA, Th(IV), etc.
- Multi-species approaches, specifying the behaviour of each species for a given compound, e.g. [UO2] 2+, [CaUO2(CO3)3]2-, [Ca2UO2(CO3)3]0.
The work will focus on the development of multi-component and multi-species migration models. Models will be applied to assess more accurately the spread of chemical perturbations in natural barriers (soils, sediments). To this aim, available experimental data will be used as input data. A main objective is to quantify the differences between approaches and potential implications for radionuclide migration & corresponding mitigation strategies.
University / doctoral school
Sciences Chimiques: Molécules, Matériaux, Instrumentation et Biosystèmes (2MIB)
Paris-Saclay
Thesis topic location
Site
Saclay
Requester
Position start date
01/10/2024
Person to be contacted by the applicant
Dagnelie Romain romain.dagnelie@cea.fr
CEA
DES/DRMP//L3MR
CEA Saclay,
DES/ISAS/DPC/SECR/L3MR
Bât450N, p82,
91191, Gif-sur-Yvette, Cedex
0169087498
Tutor / Responsible thesis director
Dagnelie Romain romain.dagnelie@cea.fr
CEA
DES/DRMP//L3MR
CEA Saclay,
DES/ISAS/DPC/SECR/L3MR
Bât450N, p82,
91191, Gif-sur-Yvette, Cedex
0169087498
En savoir plus
https://www.researchgate.net/profile/Romain-Dagnelie-2
https://www.linkedin.com/company/cea-isas