d the severity of the hazards and potential consequences (e.g., human safety and health, mission success, strategic importance).
Additionally, PRA also supports outside stakeholder requirements such as the safety analyses conducted for space nuclear missions (see NSC/PD-25, Scientific or Technological Experiments with Large-Scale Adverse Environmental Effects and Launch of Nuclear Systems into Space).
3.2.1 During the life-cycle of a program/project, risk assessments and risk information can be used to support specific phase activities and decisions and as input to the following technical reviews and phases: SDR/MDR, CDR, and ORR/FRR, and Phase E, Operations and Sustainment. The types of decisions that occur prior to and during these life-cycle phases involve:
a. Mission architecture, proposed system architecture and design, definition of functional and performance requirements, and the flow down of functional elements of the mission to ensure that the overall concept is complete and feasible.
b. Detailed design based on a demonstration that the preliminary design meets all system requirements with acceptable risk. Inputs to these decisions involve the selection of design options, the identification of interfaces, and the description of verification methods.
c. Completion of flight and ground system development and mission operations, meeting mission performance requirements, and authorizing operations (launch, flight, space, or infrastructure) based on system technical maturity, documentation, test data, and analyses that support verification.
3.2.2 A well designed PRA is structured and developed incrementally to be suited to "grow" though the life-cycle phases involving these activities. Detailed discussions of program/project life-cycle phases and technical reviews are given in NPD 7120.4, Program/Project Management, NPR 7120.5, NASA Space Flight Program and Project Management Requirements, NPR 7123.1, NASA Systems Engineering Process and Requirements, and the NASA Systems Engineering Handbook, NASA/SP-2007-6105.
3.3.1 For each program/project life-cycle phase, the PRA lead, in coordination with the PRA team, reviews the decisions that need to be made. Based on the type of program/project (crewed space flight, robotic, nuclear, infrastructure), the specific objectives, input from the program/project manager, and the program/project maturity, the PRA lead and PRA team define the scope and level of detail of the PRA. The PRA addresses technical, mission success, and safety and health risk. It does not address programmatic risk involving the consideration of cost and schedule.
Note: Comments on the development of the scope and level of detail of the PRA are given in Appendix C. A discussion of cost risk assessment is given in the NASA Cost Estimating Handbook (2008).
3.3.2 The PRA lead shall:
a. Document the plans (level, scope, and approach) for implementing and conducting the PRA in a program/project risk management plan or other planning documentation (e.g., PRA plan, program plan, reliability and maintainability plan) (Requirement 69290).
b. Ensure that the PRA plan is approved by the program/project manager and has concurrence from the Center SMA Director prior to conducting the PRA (see Section 4.6.1.c) (Requirement 69291).
| TOC | Preface | Chapter1 | Chapter2 | Chapter3 | Chapter4 | Chapter5 | AppendixA | AppendixB | AppendixC | ALL |
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