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2. PSA Methodology - Level1 PSA overview -

2. PSA Methodology - Level1 PSA overview -. Procedure. Initiating Events. Quantification. Event Trees. CDF. Uncertainty analysis Sensitivity analysis Importance Factor. ・ Accident Sequences ・ Success Criteria. Selection Quantification. Fault Trees. System Design

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2. PSA Methodology - Level1 PSA overview -

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  1. 2. PSA Methodology- Level1 PSA overview - Procedure Initiating Events Quantification Event Trees CDF • Uncertainty analysis • Sensitivity analysis • Importance Factor ・Accident Sequences ・Success Criteria • Selection • Quantification Fault Trees • System Design • Technical Specifications • Operating Procedures • Human Reliability • Component Failure Data CDF: Core Damage Frequency

  2. 2. PSA Methodology- Level1 PSA overview (cont.) - Event Trees Initiating Events Fault Trees CDF Quantification average Failure Probability

  3. 2. PSA Methodology- Initiating Events - Categorized mainly into 2 groups ; LOCAs and transients - Small LOCA, - Medium LOCA - Large LOCA LOCAs - Turbine Trip - Other Transient Transients YES PCS Available YES - MSIV Closure - Loss of Condenser Vacuum - Loss of Feed Water Off Site Power Available NO YES RCS Integrity NO - Loss of Offsite Power NO - Spurious Open of SRV Initiating event frequency is evaluated based on operating experiences.

  4. 2. PSA Methodology- Event Tree Analysis - Example of Event Tree (Large LOCA) HPCF LPFL Scram Success Fail CD : Core Damage

  5. 2. PSA Methodology- Success Criteria - • Criteria for Core Damage: • Peak Cladding Temp. 1200C “Thermal-hydraulic Analysis” to confirm “minimum combination” of mitigation systems to satisfy the criteria Start to Core Cooling 1200℃ PCT Water Level Time Time

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