The purpose is to document the accident scenarios and failure probabilities defined by NASA for the Space Transportation System (the Shuttle Data Book NSTS-08116 and supporting documentation) and used in the Ulysses Mission Safety Status Report (SSR). NASA utilized a systematic approach to identify the credible accident scenarios that might pose a threat to the radioisotope thermoelectric generator (RTG). First, the Shuttle system was divided into the following seven elements: (1) Launch Support Equipment (LSE); (2) Payload; (3) Orbiter; (4) External Tank (ET); (5) Solid Rocket Boosters (SRB); (6) Space Shuttle Main Engines (SSME); and (7) Range Safety System (RSS). Each element was further divided into its major components, and these components were then subdivided until all known failure modes were identified. The approach used to develop the different accident scenarios was to divide the mission into phases and subphases as necessary. The phases were keyed to specific events that resulted in significant changes in vehicle configuration and/or in the potential consequences to the RTG. After the phases were defined, the accident scenarios for each phase were analyzed by developing detailed fault trees for each of the seven major systems as applicable.


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    The General‐Purpose Heat Source Radioisotope Thermoelectric Generator: A Truly General‐Purpose Space RTG

    Bennett, Gary L. / Lombardo, James J. / Hemler, Richard J. et al. | American Institute of Physics | 2008


    Mission of Daring: The General-Purpose Heat Source Radioisotope Thermoelectric Generator

    Bennett, Gary / Lombardo, James / Hemler, Richard et al. | AIAA | 2006




    Next-generation radioisotope thermoelectric generator study

    Zakrajsek, June / Barklay, Chadwick / Oxnevad, Knut et al. | NTRS | 2018