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Development and application of Inverse Uncertainty Quantification methods in thermal-hydraulics

Vacancy details

General information


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



Position description


Thermohydraulics and fluid mechanics



Job title

Development and application of Inverse Uncertainty Quantification methods in thermal-hydraulics


The Service of Thermal-hydraulics and Fluid dynamics (STMF) at CEA-Saclay has proposed a new international project within the OECD/NEA WGAMA working group. It is called ATRIUM (Application Tests for Realization of Inverse Uncertainty quantification and validation Methodologies in thermal-hydraulics). Its main objectives are to perform a benchmark on relevant Inverse Uncertainty Quantification (IUQ) exercises, to prove the applicability of the SAPIUM guideline and to promote best practices for IUQ in thermal-hydraulics.
It is proposed to quantify the uncertainties associated to some physical phenomena relevant during a Loss Of Coolant Accident (LOCA) in a nuclear reactor. Two main IUQ exercises with increasing complexity are planned. The first one is about the critical flow at the break and the second one is related to the post-CHF heat transfer phenomena.

Contract duration (months)

24 months

Job description

The Post-Doc candidate will participate in the ATRIUM project in support and in coordination with the CEA team. In details, the candidate will:

·       Analyze the available experimental data and evaluate their adequacy for IUQ via the decision making process.

·       Carry out the proposed IUQ exercises. The thermal-hydraulic simulations will be performed with the system code CATHARE, which is the reference code for the safety analysis of French nuclear reactors. The model uncertainties will be quantified with the statistical methodology CIRCE. Both CATHARE and CIRCE are developed by CEA.

·       Bring new insights on the applicability of the SAPIUM best-practices and on the possible improvements necessary when quantifying model uncertainties with CIRCE.

·       Perform the uncertainty propagation on the IET and analyze the results.

·       Collect, analyze and summarize the results obtained by the different participants of the benchmark (more than 20 participants worldwide).

·       Write scientific articles in peer-reviewed journals and technical reports.

·       Present the work at OECD/NEA meetings and at international conferences.

·       The work will lead the candidate to develop his/her skills in the modelling of complex thermal-hydraulic systems, in two-phase fluid dynamics and in statistical analysis. These skills are of great interest in the current industrial sector (e.g. nuclear, automotive, and aerospace). The candidate will work in a multidisciplinary, dynamic and stimulating environment in direct contact with experts in the domain.

Applicant Profile

We are seeking an innovative self-motivated person that will be able to work independently as well as in a team. The candidate should have a PhD degree with a strong interest in fluid dynamics/thermal-hydraulic applications, experimental data and statistical modelling and analysis. Experience in nuclear reactor thermal-hydraulic modeling is highly appreciated. Knowledge of a programming language (e.g. C++, Fortran, Python or Matlab) is required. A good knowledge of English is a requirement. Knowledge of French is appreciated, but not mandatory.

Position location



Job location

France, Ile-de-France, Essonne (91)


Gif sur Yvette

Candidate criteria


  • English (Fluent)
  • French (Intermediate)

Prepared diploma

Sans diplôme

Recommended training

PhD degree with a strong interest in fluid dynamics/thermal-hydraulic and experimental data


Position start date