SPACE NUCLEAR POWER SYSTEMS.

were studied, as well as two radiator materials (Be and Nb). The use of Li in both the primary and secondary loops produced the lightest power plant. Use of Na- K in both loops gave a weight penalty of 3 to 4 pounds/kw. With Li the primary loop and Na- -K in the radiator system, the weight penalty was approximately half. A monolithic Nb radiator seems promising. Parametric data for major system components are included. (auth)