Open-cell foam nuclear fuel has been previously shown to allow very high power density reactors for nuclear thermal propulsion (NTP). In previous work, heterogeneous, thermal reactor designs were proposed utilizing foam fuel. In this work, a homogeneous, fast design is explored using a uranium foam. Included is a scoping study for optimization of a homogeneous, fast reactor which minimizes the mass. The new design is compared to a previous NTP thermal reactor design. The fast reactor design is found to have a large reduction in complexity as well as mass as compared to the previous thermal reactor design.
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