Which PSA techniques are considered primary?

Which PSA techniques are considered primary?

• A. Mean Time to Repair (MTTR), Failure Modes, Effects & Criticality Analysis (FMECA), Fault Tree Analysis (FTA), Level of Repair Analysis (LORA) are primary techniques used in PSA.
• B. Only MTTR and FMEA are used in PSA.
• C. The PSA uses inventory control methods such as EOQ.
• D. PSA techniques include MTTR and FMECA but not LORA.

Answer: (A)

PSA focuses on quantifying risk by mapping how failures occur and how maintenance affects system availability. The primary techniques used to do this are Mean Time to Repair, Failure Modes, Effects & Criticality Analysis (FMECA), Fault Tree Analysis, and Level of Repair Analysis. MTTR provides the expected downtime after a failure, which is essential for calculating availability and risk. FMECA takes failure mode analysis a step further by adding a criticality ranking, so you can prioritize which failures and repairs matter most for safety and reliability. Fault Tree Analysis builds a logical, graphical picture of how combinations of component failures lead to a top-event, helping identify the most influential failures and their relationships. Level of Repair Analysis assesses what level of maintenance and repair is appropriate for each component, affecting spares, maintenance planning, and overall system availability. Inventory methods like EOQ aren’t part of PSA, and while FMEA relates to failure analysis, the PSA uses the structured, criticality-enhanced FMECA rather than FMEA alone.

PSA focuses on quantifying risk by mapping how failures occur and how maintenance affects system availability. The primary techniques used to do this are Mean Time to Repair, Failure Modes, Effects & Criticality Analysis (FMECA), Fault Tree Analysis, and Level of Repair Analysis. MTTR provides the expected downtime after a failure, which is essential for calculating availability and risk. FMECA takes failure mode analysis a step further by adding a criticality ranking, so you can prioritize which failures and repairs matter most for safety and reliability. Fault Tree Analysis builds a logical, graphical picture of how combinations of component failures lead to a top-event, helping identify the most influential failures and their relationships. Level of Repair Analysis assesses what level of maintenance and repair is appropriate for each component, affecting spares, maintenance planning, and overall system availability. Inventory methods like EOQ aren’t part of PSA, and while FMEA relates to failure analysis, the PSA uses the structured, criticality-enhanced FMECA rather than FMEA alone.