During this internship, you will have the opportunity to: Become familiar with Monte-Carlo simulation techniques. Test a set of modeling options and study their impact on the performance of a fuel evolution calculation. These studies will be carried out on simple two-dimensional geometries of the isolated pencil and assembly type. Compare the performance of the TRIPOLI-4® code to other Monte Carlo codes available internationally. Take charge of the Monte Carlo TRIPOLI-4® code as well as several of these latest developments, and particularly the evolution calculation. Appreciate the advantages and interests of evolution calculations, while studying these limitations.