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Procedures for Assessing Risks

Procedures for Assessing Risks . Chapter 9 – Failure Modes and Effects Analysis (FMEA). Failure Modes and Effects Analysis. Failure Mode A1. Failure Mode D1. Failure Mode B1. Failure Mode A2. Component A. Component B. Component D. Failure Mode C2. Failure Mode C1. Accidents*.

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Procedures for Assessing Risks

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  1. Procedures for Assessing Risks Chapter 9 – Failure Modes and Effects Analysis (FMEA)

  2. Failure Modes and Effects Analysis Failure Mode A1 Failure Mode D1 Failure Mode B1 Failure Mode A2 Component A Component B Component D Failure Mode C2 Failure Mode C1 Accidents* Accidents* Component C *If applicable safeguards fail Accidents*

  3. Limitations of FMEA • Examination of human error is limited • Focus is on single-event initiators of problems • Examination of external influences is limited • Results are dependent on the mode of operation

  4. Procedure for FMEA 1.0 Define the system of interest 2.0 Define the problems of interest for the analysis 3.0 Choose the type of FMEA approach for the study 4.0 Subdivide the system for analysis 5.0 Identify potential failure modes for elements of the system 9.0 Use the results in decision making 8.0 Transition the analysis to another level of resolution (if necessary or otherwise useful) 7.0 Perform quantitative evaluation (if necessary) 6.0 Evaluate potential failure modes capable of producing problems of interest

  5. Procedure for FMEA 1.0 Define the system of interest 2.0 Define the problems of interest for the analysis 3.0 Choose the type of FMEA approach for the study 4.0 Subdivide the system for analysis 5.0 Identify potential failure modes for elements of the system 9.0 Use the results in decision making 8.0 Transition the analysis to another level of resolution (if necessary or otherwise useful) 7.0 Perform quantitative evaluation (if necessary) 6.0 Evaluate potential failure modes capable of producing problems of interest

  6. 1.0 Define the system of interest • Intended functions • Boundaries

  7. Procedure for FMEA 1.0 Define the system of interest 2.0 Define the problems of interest for the analysis 3.0 Choose the type of FMEA approach for the study 4.0 Subdivide the system for analysis 5.0 Identify potential failure modes for elements of the system 9.0 Use the results in decision making 8.0 Transition the analysis to another level of resolution (if necessary or otherwise useful) 7.0 Perform quantitative evaluation (if necessary) 6.0 Evaluate potential failure modes capable of producing problems of interest

  8. 2.0 Define the problems of interest for the analysis • Safety problems • Environmental issues • Economic impacts

  9. Procedure for FMEA 1.0 Define the system of interest 2.0 Define the problems of interest for the analysis 3.0 Choose the type of FMEA approach for the study 4.0 Subdivide the system for analysis 5.0 Identify potential failure modes for elements of the system 9.0 Use the results in decision making 8.0 Transition the analysis to another level of resolution (if necessary or otherwise useful) 7.0 Perform quantitative evaluation (if necessary) 6.0 Evaluate potential failure modes capable of producing problems of interest

  10. 3.0 Choose the type of FMEA approach for the study • Hardware approach (bottom-up) • Functional approach (top-down) • Hybrid of the two

  11. Procedure for FMEA 1.0 Define the system of interest 2.0 Define the problems of interest for the analysis 3.0 Choose the type of FMEA approach for the study 4.0 Subdivide the system for analysis 5.0 Identify potential failure modes for elements of the system 9.0 Use the results in decision making 8.0 Transition the analysis to another level of resolution (if necessary or otherwise useful) 7.0 Perform quantitative evaluation (if necessary) 6.0 Evaluate potential failure modes capable of producing problems of interest

  12. 4.0 Subdivide the system by equipment or functions for analysis Systems Subsystems Components Subassemblies Parts

  13. Example of the Hardware Approach (Bottom-up)

  14. Example of the Functional Approach (Top-down)

  15. Procedure for FMEA 1.0 Define the system of interest 2.0 Define the problems of interest for the analysis 3.0 Choose the type of FMEA approach for the study 4.0 Subdivide the system for analysis 5.0 Identify potential failure modes for elements of the system 9.0 Use the results in decision making 8.0 Transition the analysis to another level of resolution (if necessary or otherwise useful) 7.0 Perform quantitative evaluation (if necessary) 6.0 Evaluate potential failure modes capable of producing problems of interest

  16. 5.0 Identify potential failure modes for elements of the system • Premature operation • Failure to operate at a prescribed time • Intermittent operation • Failure to cease operation at a prescribed time • Accident of output or failure during operation • Degraded output or operational capability • Other unique failure conditions

  17. Procedure for FMEA 1.0 Define the system of interest 2.0 Define the problems of interest for the analysis 3.0 Choose the type of FMEA approach for the study 4.0 Subdivide the system for analysis 5.0 Identify potential failure modes for elements of the system 9.0 Use the results in decision making 8.0 Transition the analysis to another level of resolution (if necessary or otherwise useful) 7.0 Perform quantitative evaluation (if necessary) 6.0 Evaluate potential failure modes capable of producing problems of interest

  18. 6.0 Evaluate potential failure modes capable of producing problemsof interest • Mission phase/operational mode • Effects • Causes • Indications • Safeguards • Recommendations/remarks

  19. Procedure for FMEA 1.0 Define the system of interest 2.0 Define the problems of interest for the analysis 3.0 Choose the type of FMEA approach for the study 4.0 Subdivide the system for analysis 5.0 Identify potential failure modes for elements of the system 9.0 Use the results in decision making 8.0 Transition the analysis to another level of resolution (if necessary or otherwise useful) 7.0 Perform quantitative evaluation (if necessary) 6.0 Evaluate potential failure modes capable of producing problems of interest

  20. 7.0 Perform quantitative evaluation (if necessary) • Characterization of failure mode frequency • Characterization of failure mode severity • Characterization of failure mode risks

  21. Procedure for FMEA 1.0 Define the system of interest 2.0 Define the problems of interest for the analysis 3.0 Choose the type of FMEA approach for the study 4.0 Subdivide the system for analysis 5.0 Identify potential failure modes for elements of the system 9.0 Use the results in decision making 8.0 Transition the analysis to another level of resolution (if necessary or otherwise useful) 7.0 Perform quantitative evaluation (if necessary) 6.0 Evaluate potential failure modes capable of producing problems of interest

  22. 8.0 Transition the analysis to another level of resolution (if necessary or otherwise useful) Systems Subsystems Components Subassemblies Parts

  23. Procedure for FMEA 1.0 Define the system of interest 2.0 Define the problems of interest for the analysis 3.0 Choose the type of FMEA approach for the study 4.0 Subdivide the system for analysis 5.0 Identify potential failure modes for elements of the system 9.0 Use the results in decision making 8.0 Transition the analysis to another level of resolution (if necessary or otherwise useful) 7.0 Perform quantitative evaluation (if necessary) 6.0 Evaluate potential failure modes capable of producing problems of interest

  24. 9.0 Use the results in decision making • System improvements • Maintenance task planning • Spare parts inventories • Troubleshooting guidelines

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