The design of fuel charges includes fuel design, fuel and fuel charges modeling, and calculations to demonstrate whether a given fuel charge complies with all safety requirements for the operation of the core zone and the nuclear reactor. ÚJV Řež develops methodological procedures and software for these activities.

ANDREA software is an advanced software for the neutron-physical computation of active zones of pressurized water reactors.

CycleKit software is used to automate large-scale calculations for safety assessments of fuel charges.