Many times, I thought I had left my history in the dust, only to have a new team bring it back to me. In case you are wondering about the title of this paper, it is a type of nuclear fission reactor that was in my deep past. I graduated from college (BSEE) in 1975. My first job out of college was with Rockwell Atomics International. The projects I worked on there all involved a type of reactor called a Liquid Metal Fast Breeder Reactor.
The “Liquid Metal” was its heat-transfer fluid: either liquid sodium or a sodium-potassium alloy (NaK). “Fast” refers to the neutrons emitted by the nuclear reaction that are “fast” (high-energy), and remain fast until they undergo additional reactions. In a standard water-cooled fission reactor, the neutrons are moderated (have their energy reduced). Breeder means that the LMFBR breeds its own fuel.