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Portal > Offres > Offre UMR5257-LAUCLA-001 - Ingénieur de recherche en radiochimie : lixiviation du combustible nucléaire usé en condition d'entreposage (H/F)

Research engineer in radiochemistry : nuclear fuel leaching under interim repository conditions (H/F)

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Français - Anglais

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General information

Reference : UMR5257-LAUCLA-001
Workplace : BAGNOLS SUR CEZE
Date of publication : Friday, July 17, 2020
Type of Contract : FTC Technical / Administrative
Contract Period : 12 months
Expected date of employment : 14 September 2020
Proportion of work : Full time
Remuneration : Gross monthly salary between 2300 € and 2500 €
Desired level of education : PhD
Experience required : 1 to 4 years

Missions

As part of the European EURAD EJP project, the Laboratory of the Evolving Interfaces in Materials (LIME) of the Institute of Partitioning Chemistry of Marcoule (ICSM) has to study the chemical durability of model sintered compounds for spent nuclear fuel to mimic their behavior during accidental cladding rupture under interim repository in nuclear pool.

In the present project, the applicant will be in charge of the preparation of a large variety of sintered UO2 pellets, which could contain :
- Fission Products (FP) such as lanthanide elements ;
- Fission Products such as Platinum Group Metals (Pd, Ru, Rh)
- Molybdenum.

The second part of the work will be to apply the micro-/macro- dual methodology to examine the role of several families of FP on the behavior of UO2 sintered samples during leaching tests in conditions representative for interim storage in nuclear pools (nature of water, temperature, ...).

Activities

The recruited people will be in charge / responsible for several tasks :

- Synthesis of lanthanide bearing UO2 ceramics (with various lanthanide compositions and incorporation rates);
- Synthesis of PGM bearing UO2 ceramics (with various incorporation rates);
- Synthesis of molybdenum based materials;
- Synthesis of sintered pellets containing simultaneously Ln + PGM + Mo;

- Microstructural and chemical characterization of the prepared samples;

Additionally, he/she will develop leaching tests by combining the micro- and macroscopic approach already applied with success to other kinds of oxide based ceramics. This task will include the:

- Design of the leaching tests and determination of the normalized dissolution rates;
- Sorting of the parameters of interest, which impact the chemical durability of the pellets;
- Analysis of the results and understanding of the mechanisms occurring during the alteration process.

The Recruited people will also have to manage his/her U based samples as nuclear materials.

The recruited people will be in charge / responsible for several tasks :

- Synthesis of lanthanide bearing UO2 ceramics (with various lanthanide compositions and incorporation rates);
- Synthesis of PGM bearing UO2 ceramics (with various incorporation rates);
- Synthesis of molybdenum based materials;
- Synthesis of sintered pellets containing simultaneously Ln + PGM + Mo;

- Microstructural and chemical characterization of the prepared samples;

Additionally, he/she will develop leaching tests by combining the micro- and macroscopic approach already applied with success to other kinds of oxide based ceramics. This task will include the:

- Design of the leaching tests and determination of the normalized dissolution rates;
- Sorting of the parameters of interest, which impact the chemical durability of the pellets;
- Analysis of the results and understanding of the mechanisms occurring during the alteration process.

The Recruited people will also have to manage his/her U based samples as nuclear materials.

Skills

The recruited people should have some competencies in Analytical chemistry (ICP-AES, ICP-MS) and Radiochemistry (working with radioactive materials and solutions, analysis of radioelements or radionuclides in solution)

He/she should have significant knowledge on the preparation of U-based materials (especially using wet chemistry routes), sintering (if possible) and chemistry of uranium in solution. A complementary knowledge on the nuclear fuel cycle should be strongly appreciated.

The candidate should be also able to manage various techniques of characterization of the material, solid-liquid interface and of the solution.

Work Context

The agent will join the Laboratory of Evolving Interfaces in Materials (LIME). This team is composed of 5 researchers, several PhD and post-doctoral students. Its fields of interest are mainly focused on the synthesis of actinide based materials, study of evolving solid/solid interfaces (during sintering process) and solid/liquid interfaces (during dissolution/leaching/alteration process). The studied materials are of interest either in the field of the front-end and of the back-end of the nuclear fuel cycle.
One important target is to link the conditions of elaboration and sintering of a material to the control of its properties in use (such as its chemical durability).

Constraints and risks

Experiments with natural or depleted uranium (and radioelements) will require specific training and authorization, which will also include medical control and authorization. The agent will have to attend specific training for the handling of radioactive matter and materials as well as safety. He/she will be able to attend such a training at the beginning of the contract.

Additional Information

ICSM is located in Bagnols sur Ceze (Gard, France). It is a part of the Pole Chimie Balard (Montpellier). It is a shared institute between four institutions : CNRS, University of Montpellier, High School of Chemistry of Montpellier and CEA.

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