Safe affordable fission engine

Safe affordable fission engine (SAFE) were NASA's small experimental nuclear fission reactors for electricity production in space.

[1] Most known was the SAFE-400 reactor concept intended to produce 400 kW thermal and 100 kW electrical using a Brayton cycle closed-cycle gas turbine.

[2] The fuel was uranium nitride in a core of 381 pins clad with rhenium.

It was developed at the Los Alamos National Laboratory and the Marshall Space Flight Center under the lead of Dave Poston.

[7] The project was funded with discretionary money in the lab's budget and done mostly outside the researchers' normal work.