Commissariat à l'Énergie Atomique
Job title:
Post-Doc in aerosol and/or material science
Company:
Commissariat à l’Énergie Atomique
Job description
Entité de rattachement Le CEA est un acteur majeur de la recherche, au service des citoyens, de l’économie et de l’Etat.Il apporte des solutions concrètes à leurs besoins dans quatre domaines principaux : transition énergétique, transition numérique, technologies pour la médecine du futur, défense et sécurité sur un socle de recherche fondamentale. Le CEA s’engage depuis plus de 75 ans au service de la souveraineté scientifique, technologique et industrielle de la France et de l’Europe pour un présent et un avenir mieux maîtrisés et plus sûrs.Implanté au cœur des territoires équipés de très grandes infrastructures de recherche, le CEA dispose d’un large éventail de partenaires académiques et industriels en France, en Europe et à l’international.Les 20 000 collaboratrices et collaborateurs du CEA partagent trois valeurs fondamentales :
- La conscience des responsabilités
- La coopération
- La curiosité
Référence 2025-35545Description de l’unitéLaboratory (LEAG) in charge of carrying out experimental R&D on the PLINIUS platform to simulate nuclear reactor severe accident materials. 20+ staff including 7 students and post-docs.Description du posteDomaineMatériaux, physique du solideContratPost-doctoratIntitulé de l’offrePost-Doc in aerosol and/or material scienceSujet de stageThis postdoctoral research aims at studying aerosol generation and transformation mechanisms for both thermal and mechanical cutting during the future decommissioning of Fukushima Daiichi nuclear power reactors. It will be based on CEA large experimental database on this issue.Durée du contrat (en mois)12Description de l’offreDuring Fukushima Daiichi nuclear reactor accident, several hundred tons of fuel debris (the mixture generated by the reactor core melting and its interaction with structural materials) have been formed. Japanese government plans to dismantle with 30 to 40 years Fukushima Daiichi nuclear power station, which implies recovering these fuel debris.CEA is participating with French partners to several projects funded by the Japanese government aiming at developing fuel debris cutting. Mastering the risks due to radioactive aerosols generated during these operations is one important aspect of this R&D. In this framework, CEA has fabricated fuel debris prototypes corresponding to chemical compositions that have been estimated for these severe accidents. The French consortium has collected and analysed the aerosols produced during mechanical cutting as well as during high temperature heating simulating thermal cutting.For thermal cutting, an important source of aerosol seems to be partial evaporation/condensation of many chemical species that are present in the fuel debris. A thermodynamic modelling shall be proposed, using the NUCLEA or TAF-ID thermodynamic databases, coupled with some kinetic effects.For mechanical cutting, relations between the phases observed on the bulk samples and the observed aerosols will be considered in view of determining a phenomenological understand and in a second stage modelling it. Then, the observed of the cutting atmosphere (humidity, air vs. nitrogen) should be explained and its mechanisms could be quantified.Your missions would be:– a bibliographical study in which, in addition to the state of the art on aerosols produced by mechanical and thermal cutting, there shall be a comparison with the literature dedicated to radioactive aerosol release during severe accidents.– a critical synthesis of the experimental results achieved by this French consortium that encompass several fuel debris simulant block compositions.– chemical or crystallographic analyses of some samples already in the laboratory but not yet analysed.– model development for fuel debris aerosols generation and transformation phenomena, in particular, evaporation/condensation during thermal processes and/or agglomeration of aerosol particles.Moyens / Méthodes / LogicielsExisting experimental database, microstructural analysis, ThermoCalc thermodynamic softaware, AerosoProfil du candidatPhD or equivalent in material engineering, aerosol science, chemical thermodynamics and/or nuclear engineering.Localisation du posteSiteCadaracheLocalisation du posteFrance, Provence-Côte d’Azur, Bouches du Rhône (13)VilleSaint Paul lez DuranceCritères candidatFormation recommandéeDoctoratPossibilité de poursuite en thèseNonDemandeurDisponibilité du poste01/09/2025
Expected salary
Location
Bouches-du-Rhône
Job date
Fri, 14 Mar 2025 06:21:00 GMT
To help us track our recruitment effort, please indicate in your email/cover letter where (vacanciesin.eu) you saw this job posting.