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Dick Bolt David Bogart June 28, 2001

Dick Bolt David Bogart June 28, 2001. Supernova/Acceleration Probe (SNAP). Reliability & System Safety. Reliability Requirements. Mission/System Mission life of 2 years required, and a goal of 5 years desired Probability of mission success Instrument

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Dick Bolt David Bogart June 28, 2001

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  1. Dick Bolt David Bogart June 28, 2001 Supernova/Acceleration Probe (SNAP) Reliability & System Safety

  2. Reliability Requirements • Mission/System • Mission life of 2 years required, and a goal of 5 years desired • Probability of mission success • Instrument • Spectroscopy data, while ~1% of total data stream, is high priority since small loss of this data is not recoverable through statistical techniques SNAP, June 25-28, 2001 Goddard Space Flight Center

  3. Launch Ground Instruments Spacecraft Vehicle System R(mission) = R(LV) x R(Satellite) x R(Ground System) ¨ R(Satellite) = R(Spacecraft) x R(Instrument) ¨ Mission Success Diagram SNAP, June 25-28, 2001 Goddard Space Flight Center

  4. Launch Vehicle • Delta III • Reliability of launch vehicle not well established at this time • Atlas IV • Reliability of launch vehicle not well established at this time • Sea Launch - Zenit-3SL • Demonstrated reliability of 85.7% (6 successful launches out of 7) • Sea Launch calculated reliability of 93.7% • Sea Launch people likely have reevaluated reliability based on fixes for their launch failure • Need to see data and numbers • Need to see if any other failures occurred in past 6 launches that did not result in launch failure SNAP, June 25-28, 2001 Goddard Space Flight Center

  5. RSDO Bus Reliability • RSDO Buses Proposed as Base Design • StarBus: 98% @ 2 years, 95% @ 5 years • MidStar: 95% @ 2 years, 88.6% @ 5 years • BCP 2000: 95% @ 2 years, 88.6% @ 5 years • SA-200HP: 91% @ 2 years, 79% @ 5 years • Full Redundancy Option: 99% @ 2 years, 96% @ 5 years • LM 900: 87.6% @ 2 years, 72% @ 5 years • Each of the RSDO Buses require significant modifications to meet mission requirements. These modifications will likely have a significant effect on reliability estimates. SNAP, June 25-28, 2001 Goddard Space Flight Center

  6. Instrument Reliability Requirement SNAP, June 25-28, 2001 Goddard Space Flight Center

  7. Reliability Considerations • Recommend Probabilistic Risk Assessment (PRA) to identify key areas for redundancy/high qual parts • Reliability Predictions, Fault Tree Analysis, Failure Modes and Effects Analysis • Spectroscopy Data • Storage of Spectroscopy Data to Ensure Data • Allow Spectroscopy to be sent via S-Band as back up. • RF • High Data Rates - Ka Unit • Ka Band XMTR Reliability Data from DoD sources • Optical Imager • Effects of lost pixels on science data • Consider redundant means to open instrument shutter • Consider redundant means to select filter position SNAP, June 25-28, 2001 Goddard Space Flight Center

  8. Safety Overview-(Delta/Atlas) • Safety Process Overview (Delta/Atlas) • Protection of Public, Personnel, and Assets • Preliminary Hazard Analysis • Tailoring of EWR 127-1 • Preparation and Submittal of Missile System Prelaunch Safety Package (MSPSP) • Review and Approval of MSPSP by Range Safety • Closure of any action items/verifications required by MSPSP/Range Safety SNAP, June 25-28, 2001 Goddard Space Flight Center

  9. System Safety-(SeaLaunch) • SeaLaunch Safety Considerations • Evaluation and approval of SeaLaunch S&MA Director • Licensing by the U.S. DOT of the Associate Administrator for Commercial Space Transportation (FAA/AST) • Safety review schedule and data submittal agreements established during initial customer interface meeting. Basic requirements identified in the SeaLaunch User’s Guide, Boeing Doc D688-10009-1, Section 11. • Sea Launch Safety Plan, Boeing Document D688-10014-1. • Three phase safety review process • Preliminary Design Review (PDR) • Critical Design Review (CDR) • Ground Operations Readiness Review (GORR) • Iterative process of • Defining requirements • Identifying hazards • Identify hazard controls • Verify hazard controls SNAP, June 25-28, 2001 Goddard Space Flight Center

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