Conceptual design of the bimodal nuclear power system based on the ‘‘Romashka’’ type reactor with thermionic energy conversion system

The paper presents conceptual design of the bimodal space nuclear power system (NPS) based on the high‐temperature reactor of ROMASHKA type with thermoninic energy conversion system. At the heart of the design is an employment of close‐spaced thermionic diodes, operating in a quasi‐vacuum mode. The paper gives preliminary estimates of the NPS neutron‐physical, electric, thermophysical and mass‐dimensional parameters for the reactor electric power of 25 kW and propulsive thrust of about 80 N. Discussed are peculiarities of the combined mode wherein electric power is generated along with propulsive thrust. The paper contains results of the design studies performed by the Small Business ‘‘NP Energotech’’ under the Agreement with Rockwell International/Rocketdyne Division and according to the Rocketdyne Division provided Design Requirements. Involved in the work was the team of specialists of RRC ‘‘Kurchatov Institute’’, ‘‘Red Star’’ State Enterprise and Research Institute of SPA ‘‘Luch’’