Accession Number : AD0620151

Title :   NUCLEAR ENGINE CLUSTERING CONSIDERATIONS,

Corporate Author : DOUGLAS AIRCRAFT CO INC SANTA MONICA CALIF MISSILE AND SPACE SYSTEMS DIV

Personal Author(s) : Langley,R. W. ; Woyski,J. S.

Report Date : 1965

Pagination or Media Count : 37

Abstract : Some considerations involved in the clustering of solid-core nuclear engines are examined parametrically in order to determine their importance and to indicate the effect of system tradeoffs on vehicle performance. These include neutronic coupling effects, structural requirements, shielding, and reliability. A potentially important consideration is the propulsion system reliability. To satisfy typical propulsion reliability requirements for a manned mission, it is shown that clustering with engine-out capability is very effective in relaxing the reliability constraints of the individual engines. For example, for a Mars landing mission, engine-out capability on the first three stages results in an initial weight-out-of-orbit penalty of only 15%, but reduces the individual engine reliability requirement from 0.992 to 0.96. This can represent a sifnificant difference in engine development effort. (Author)

Descriptors :   (*NUCLEAR PROPULSION, SPACE PROPULSION), (*ENGINE CLUSTERS, NUCLEAR PROPULSION), (*SPACE PROPULSION, NUCLEAR PROPULSION), ASTRONAUTICS, SPACE PROBES, SPACECRAFT, PROPULSION SYSTEMS, FEASIBILITY STUDIES, NUCLEAR ENGINEERING

Distribution Statement : APPROVED FOR PUBLIC RELEASE