AEC research and development reports. BAW-1326. 1000 MWe LMFBR liquid metal fast breeder reactor follow-on study; Babcock & Wilcox, task 2 and 3 report, Topical report, Sodium parameter study, code "NAPS" (Computer program for parametric studies of sodium-cooled fast breeder reactor plants) [with list of references; by R. A. Crane and others].