In this work, two different thermodynamic softwares, ANGE using the TBASE database, and OPENCALPHAD using the TAF-ID (Thermodynamics of Advanced Fuels – International Database), have been integrated into the GERMINAL V2 fuel performance code (of the PLEIADES platform) in order to evaluate the chemical state of (U,Pu)O2 fuel and fission products in sodium cooled fast reactors. | An improved method to evaluate the Joint Oxyde-Gaine formation in U Pu O2 irradiated fuels using the GERMINAL V2 code coupled to Calphad thermodynamic computations EPJ Nuclear Sci. Technol. 6 47 2020 Nuclear Sciences c K. Samuelsson et al. published by EDP Sciences 2020 amp Technologies https epjn 2020008 Available online at https REGULAR ARTICLE An improved method to evaluate the Joint Oxyde-Gaine formation in U Pu O2 irradiated fuels using the GERMINAL V2 code coupled to Calphad thermodynamic computations Karl Samuelsson 1 Jean-Christophe Dumas 2 Bo Sundman 3 and Marc Lainet 2 1 KTH Royal Institute of Technology Nuclear Engineering 106 91 Stockholm Sweden 2 CEA DEN DEC Centre de Cadarache 13108 Saint-Paul-lez-Durance France 3 OPENCALPHAD 9 All ee de l Acerma 91190 Gif-sur-Yvette France Received 20 September 2019 Received in final form 2 December 2019 Accepted 21 February 2020 Abstract. In this work two different thermodynamic softwares ANGE using the TBASE database and OPENCALPHAD using the TAF-ID Thermodynamics of Advanced Fuels International Database have been integrated into the GERMINAL V2 fuel performance code of the PLEIADES platform in order to evaluate the chemical state of U Pu O2 fuel and fission products in sodium cooled fast reactors. A model to calculate the composition and the thickness of the Joint-Oxyde Gaine JOG fission product layer in the fuel-clad gap has been developed. Five fuel pins with a final burnup ranging between and FIMA Fissions per Initial Metal Atom have been simulated and the calculated width of the fission product layer have been compared with post irradiation examinations. The two different thermodynamic softwares have been compared in terms of computation time and predicted fuel-to-clad gap chemistry. The main elements and phases encountered in the fission productlayer have been identified and the impact of the changing oxygen potential has been explored. 1 Introduction transported .
