So here's a mystery. I was skimming an old AEC list of reactor proposals for article ideas, and I came across an entry for a reactor called "BRENDA", that was going to be built by the Societe Nationale D'Etudes et de Construction de Moteurs D'Aviation (SNECMA) and the Commissariat à l'Energie Atomique (CEA) in Cadarache, France. The reactor was gas-cooled, used ceramic-clad enriched uranium oxide fuel, and would be moderated by beryllium oxide. 1 MWth power, 1300 F temperature. Purpose: aircraft propulsion prototype.
Now that's certainly something.