International Conference on Fast Reactors and Related Fuel Cycles FR22: Sustainable Clean Energy for the Future (CN-291)

France-Japan Collaboration on Thermodynamic and Kinetic Studies of Core Material Mixture in Severe Accidents of Sodium-Cooled Fast Reactors

22 Apr 2022, 14:30

12m

Vienna, Austria

ORAL Track 5. Test Facilities and Experiments 5.3 Experimental Programs II

Speaker

Dr Andrea Quaini (ISAS, Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), CEA, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France)

Description

In the framework of the current implementing arrangement on France-Japan collaboration on Sodium-cooled Fast Reactors (SFRs) from 2020 to 2024, the R&D tasks called “Thermodynamic and Kinetic Studies of Core Material Mixture” is intended to improve models on material interactions at thermodynamic equilibrium and kinetics of reactions for use in severe accident simulation codes with experimental data production. This task includes experimental study on chemical interaction between (U,Pu)O2, B4C and stainless steel (SS), high temperature thermodynamic and thermo-physical properties of complex mixtures studies, and modelling of mixtures thermodynamics and liquefaction kinetics.
The previous implementing arrangement (2014-2019) was organized in two phases:
• The first phase (2014-2015) focused on the comparison between French and Japanese thermodynamic databases using the Calphad method. The French and Japanese teams developed a modelling approach for the severe accident simulation code SIMMER based on possible accidental scenarios during the reactor degradation.
• In the second phase (2016-2019), CEA and JAEA has conducted thermodynamics studies, experimental programs to support core material mixture modelling, and the development of models for severe accident simulation code.
These collaborative tasks were successfully accomplished and continuous R&D items were identified.
Based on the previous collaboration, CEA and JAEA defined the following sub-tasks under the current implementing arrangement:
 Kinetics of interaction in core material mixtures,
 Physical properties of core material mixtures,
 High temperature thermodynamic data for the UO2-Fe-B4C system,
 Experimental studies on B4C-SS kinetics and B4C-SS eutectic material relocation (freezing) with/without sodium,
 B4C/SS eutectic and kinetics models for SIMMER code systems,
 Methodology for the modelling of mixtures liquefaction kinetics.
This paper describes major R&D results obtained in the France-Japan collaboration under the previous implementing arrangement as well as experimental and analytical roadmaps under the current arrangement.

Presentation materials

FR22-ID86_final.docx

Peer reviewing

Paper

Accepted on 1 Jul 2022 by Nikoleta MORELOVA

Paper files:

• FR22-ID86_final.docx