Over a period of time from 2012 to 2023, a special program (computer code), which currently has no analogues in the Russian Federation, was created and modified. The FC-FNS code was developed for simulating fuel nuclide fluxes and their inventories in fuel cycle systems, with allowance for the fuel cycle architecture and candidate technology solutions, including the system for the injection of neutral beams of different isotopic compositions. The results of using the code for determining the parameters of fuel injection and for pumping and processing tritium-containing gas mixture are presented for various plasma parameters in fusion facilities with blankets.

Despite using a fairly simple interface and the Microsoft Excel environment instead of the special programming language, the code allows for simulating the coordinated operation of many fuel cycle systems, including the tokamak vacuum vessel with plasma. The distinctive feature of the model is not the precise modeling the entire system (including plasma), but the modeling of the joint operation of a large number of interconnected elements in which physical and chemical processes occur, which differ by several orders of magnitude both in duration and the amount of substance involved.