Gas Core Reactors for Deep Space Propulsion Mikhail V. Shubov University of MA Lowell, One University Ave, Lowell, MA 01854 E-mail:
[email protected] Abstract The operation of a nuclear power station powering Deep Space transport is presented in the pa- per. The power station consists of a Gas Core Reactor (GCR) with magnetohydrodynamic (MHD) generator. A new model of gas core reactor which has advantages by comparison with known models is suggested. It is shown that 200 ton system would generate 200 MW electricity. The gas core reactor consists of a spherical cavity of 1 m to 1.5 m radius surrounded by a 50 cm thick 235 liquid beryllium reflector within molybdenum–92 container. The fuel consists of UF4, KF, and K. It is demonstrated that such power station will work for gaseous fuel pressures of 50 atm to 100 atm. The Monte-Carlo simulations describing paths of thousands of neutrons are performed. These simulations yield neutronic results, i.e. the fractions of neutrons causing fission, being ab- sorbed by moderator, and escaping the reactor. From this information one can calculate minimum needed pressure inside the reactor, the reactor size, and moderator thickness. The conductivity of superheated fuel depending on temperature and pressure is also calculated. It is concluded that space propulsion is the best use of uranium resources. Keywords: Nuclear Space Power, Magnetohydrodynamic Energy Conversion, Gas Core Nuclear Reactors, Space Exploration Introduction Deep Space transportation of large payloads would use electrically powered magnetoplasmady- namic thrusters to provide momentum for maneuvers. These thrusters use lithium propellant. The 3 2 thrusters should provide a sustained acceleration of 10− m/s for the space transport.