Several key elements are to be expected in view of the numerical twin: - The testing and adaptation of existing neutron models initially developed at CNRS based on the Transient Fission Matrix (TFM) approach as well as Correlated Sampling (CS). - The interfacing with the 3DEXPERIENCE platform containing the thermal- hydraulic modelling tools. - The development of advanced thermal-hydraulic models such as melting and pressure wave.
In addition, the numerical twin aims to allow accurate calculations in a reasonable time. For this reason, the thermal-hydraulic modelling will probably focus on system code and/or porous medium modelling due to the complexity of the flow in the plate network. Additional computational tools will be useful in terms of code-to-code validation of the numerical twin and for future exchanges with other institutes such as IRSN using common tools. For this reason, a third objective concerns the adaptation of the neutron- thermohydraulic coupling based on TFM and the Computational Fluid Dynamics (CFD) code OpenFOAM to the NAAREA core design in order to allow very accurate, albeit significantly longer, calculations. Regular technical will have to written (synthetic reports every 3 months and detailed reports every 6 months). A minimum of one publication and participation in an international conference is also expected, either on an equivalent geometry for intellectual property reasons or on a different system to focus on the methods.
Within the framework of the development of an XSMR regenerator operating with molten salts and with a power of the order of a few tens of MW, The LPSC MSFR team is working in close collaboration with NAAREA and Assystem on the development of a digital twin of the reactor based on the 3DEXPERIENCE platform. This tool aims to reproduce the behavior of the system in order to design such an object and also study its safety. Ultimately, for an existing reactor, the digital twin aims to predict its behavior at each moment of its life cycle. This twin starts from the description of the reactor and integrates the different physics of interest depending on the type of output considered: thermo-mechanics, thermal-hydraulics, physico-chemistry, neutron kinetics (short time) or neutron evolution calculations (long time). Some of these disciplines interact directly and their integration in the same tool will make it possible to obtain a numerical model as close as possible to a real system. The developments to be carried out and the post-doctoral work are positioned at the level of neutron kinetics as well as its interaction with thermal- hydraulics. This type of coupling is useful for studying the behavior of the reactor at equilibrium (temperature distribution) and also outside equilibrium for normal operation (change in core power level) and accidental operation (safety transients).
The Grenoble Laboratory of Subatomic Physics and Cosmology (LPSC) (https:// lpsc.in2p3.fr) is a joint research unit associating CNRS-IN2P3, Grenoble Alpes University (UGA) and Grenoble INP school, for an average staff of about 230 people.
The postdoc will be assigned́(e) to the MSFR team composed of 3 permanent researchers of the LPSC and will be placed under the direct hierarchical authority of the team leader, Mrs Elsa Merle. He/she will be technically supervised by a researcher of the team, Axel Laureau.Eligibility criteria
The candidate should have a PhD in reactor physics or equivalent. He/she should: - Have a good knowledge of reactor physics (neutronics, thermal-hydraulics, safety...) - Have a good knowledge of the use of a neutronic code and a thermal- hydraulic code - Be able to work in a team in the context of a wide range of collaborations - Be used to developing computer code, particularly in Python, C++ and Java - Be able to produce a large amount of data - Be fluent in French and scientific English, spoken and written - Use of classical Microsoft Office communication tools (word and powerpoint) - Be rigorous: know how to report (write scientific reports and make scientific presentations), respect deadlinesWeb site for additional job details
https: // emploi.cnrs.fr/Offres/CDD/UMR5821-CHRVEL-132/Default.aspxRequired Research Experiences
1 - 4Offer Requirements
Physics: PhD or equivalent
FRENCH: BasicContact Information