Dormancy effects on the reliability of nuclear thermal propulsion systems for long-term manned space missions

Details Dormancy effects on the reliability of nuclear thermal propulsion systems for long-term manned space missions Dormancy effects on the reliability of nuclear thermal propulsion systems for long-term manned space missions

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aipc..271..287s&link_type=abstract

Proceedings of the tenth symposium on space nuclear power and propulsion. AIP Conference Proceedings, Volume 271, pp. 287-294 (

Computer Science

Propulsion Reactors

Scientific paper

This paper explores the effects of dormancy on the reliability of a Nuclear Thermal Propulsion (NTP) system for long-term manned space missions, such as Mars exploration. Dormancy refers to the portion of space systems operation where the power and stress levels are significantly reduced from nominal values and the authors have identified dormancy as a significant effect. Three approaches are used to evaluate the relative importance of failure rates during dormant operation: use of failure rate models involving dormancy, power cycling and fully energized operation; study of data bases which include both dormant and energized failure rates; predictions based on an Arrhenius rate process formulation. The results of these approaches suggest that for a long term manned mission the dormancy, cycle, and energized failure rates will all be important. Reliability in the energized state normally receives utmost attention and care during design, however, unless equal attention is directed to dormancy, the mission reliability may be severely compromised.

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