FITX: a fast burn-up scheme based on the fitting of one-group cross-sections

Due to the high computational cost of detailed burn-up calculations, most scenario codes use burn-up tables or parametrized few group cross-sections to calculate fuel depletion in the reactors. As a special parametrization approach, a fast burn-up scheme called FITXS was developed at the BME Institute of Nuclear Techniques (BME NTI), which is based on the fitting of one-group cross-sections as polynomial functions of the detailed fuel composition. The FITXS scheme was used to develop burn-up models for the Generation IV Gas-cooled Fast Reactor (GFR), Lead-cooled Fast Reactor (LFR) and Sodium-cooled Fast Reactor (SFR), as well as MOX fuel assemblies of the Generation III European Pressurized Reactor (EPR) and VVER-1200. This document is composed of an introduction and the slides of the presentation.