Electronic model «FC-FNS» of the fusion neutron source DEMO-FNS fuel cycle and modeling hydrogen isotopes flows and inventories in fueling systems

Abstract

The conceptual design of the fuel cycle systems of a hybrid fusion neutron source DEMO-FNS is conducted in this paper. Fusion neutron source is promising for research, testing of structural materials of future fusion and fusion-fission hybrid reactors, utilization of nuclear waste, fuel breeding and control of subcritical nuclear systems. The facility operation requires the continuous injection of the fuel mixture of hydrogen isotopes (deuterium and tritium) into the vacuum chamber, as well as its subsequent pumping and processing. The key task of the fuel cycle (FC) design is to create a closed system providing the conditions for fusion burning in plasma, with reduce tritium inventory in the system elements. For this purpose “FC-FNS” electronic model has been actively developing as a tool for estimating fluxes of DT fuel and T inventories in systems where tritium is used. The paper describe the conceptual fuel cycle design for the DEMO-FNS facility and results of the modeling of hydrogen isotopes flows and inventories in fuel systems for steady-state operation mode. The paper compares various conceptual approaches to neutral beam injection system gas supply and chooses the optimal variant for its integration into the DEMO-FNS FC.