"Mobility of fissile materials (U, Pu) in a geological disposal location for nuclear waste in clay formations”
Start: as soon as possible
Duration 2 years
Context of the subject:
The Post-Doctoral position is financed by the chair "STORAGE AND DISPOSAL OF RADIOACTIVE WASTE", a chair in partnership with Andra, EDF, Orano and IMT Atlantique. By pooling their expertise, the members of the chair aim to carry out a scientific programme based on a concerted vision to develop a sustainable radioactive waste conditioning and disposal system.
Cigéo is the French project to establish an industrial facility for the disposal of high-level and medium-level long-lived radioactive waste in deep geological clay formations. Within the Cigéo facilities, it is planned to dispose the radioactive waste in locations, excavated in the Callovo-Oxfordian clay formation, lined by cementitious materials. The proposed Post-Doctoral study focuses more specifically on the fate of plutonium and uranium within a disposal cell following their release over time from certain types of long-lived medium level radioactive wastes. The aim is to provide new scientific insight in the phenomenology constraining potentially existing reconcentration phenomena of fissile material within the repository allowing demonstrations of criticality safety after the closure of the repository.
Scientific programme of the Post Doctoral study:
The work envisaged during this 2 years research program aims to provide new knowledge on the behaviour of plutonium and uranium in the hydrogeochemical conditions of a HLW repository. The aim is to study the solid/solution reactivity phenomena (precipitation, co-precipitation, dissolution, retention, etc.) in a complex geochemical environment characterised by the absence of any trace of oxygen, the presence of hydrogen and a hyperalkaline pH that changes over time.
The experimental work in radiochemistry will be carried out at the joint research unit, SUBATECH (IMT-Atlantique, CNRS-IN2P3, University of Nantes) in Nantes, France. The concentrations of Plutonium that can be handled in the laboratory will limit us to measurements and quantifications in aqueous solution. The laboratory has experimental equipment and analytical instruments (glove boxes, IC, ICP-MS, gamma spectrometer, liquid scintillation counting) allowing to work safely in inactive and radioactive environments.
The scientific questions will concern:
The scientific challenges to be addressed during this Post-Doctoral study are the following:
We are looking for a candidate who considers these experimental difficulties as a challenge. He/she will have a PhD thesis in radiochemistry, geochemistry, analytical chemistry, environmental chemistry or materials chemistry.
Please send your questions or applications to
|Title||Post-Doctoral position in Radiochemistry at SUBATECH / Nantes|
|Job location||4 rue Alfred Kastler – La chantrerie – BP 20722, 44307 Nantes|
|Published||September 15, 2021|
|Job types||Postdoc  |
|Fields||Materials Chemistry,   Analytical Chemistry,   Environmental Chemistry,   Radiochemistry,   Geochemistry  |