Here’s the historical information on the nuclear Soyuz variants I have been able to find. My Russian is not great, in some cases the translation is awkward or not completely clear. Nick
The draft design of the rockets started on the basis of the Decree of June 30, 1958. Two bureaus, OKB-456, and OKB-670 were involved. The design chosen was based on direct heating of the working fluid, and it’s ejection through the nozzle. An open core reactor, in other words.
OKB-456 is now known as NPO Energomash, and at the time was run by the brilliant but prickley rocket engine designer, V P Glushko. OKB-670 was run by M M Bondariuk. Bondariuk had been working on nuclear ammonia rockets since 1954. Continue reading “RN-2, the Nuclear R7, The Historical Reference Information”