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Diablo Canyon NPP Probabilistic Risk Assessment Program

IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making. 2. Risk Management and It's Application at Diablo Canyon NPP (DCPP) . A process that evaluates the change in risk as a result of plant changes in hardware, configuration, commitments, processes, activities, and human and equipment performance. The process uses risk- and performance-based methods as opposed to traditional prescriptive methods. .

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Diablo Canyon NPP Probabilistic Risk Assessment Program

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    1. Diablo Canyon NPP Probabilistic Risk Assessment Program Workshop Information Lesson: IV 3_11.2 Purpose: To present and explain the Probabilistic Risk Assessment Program implemented in Diablo Canyon NP Learning objectives:To get an global overview of an Utility Risk Management Program and its motivation. To know PSA Program History. To know PSA applications and configuration control process. To know Expert Panel organisation and responsibilities Duration: 1 [hr] Resources: screen, video projector, PC, PowerPoint 2000®Lesson: IV 3_11.2 Purpose: To present and explain the Probabilistic Risk Assessment Program implemented in Diablo Canyon NP Learning objectives:To get an global overview of an Utility Risk Management Program and its motivation. To know PSA Program History. To know PSA applications and configuration control process. To know Expert Panel organisation and responsibilities Duration: 1 [hr] Resources: screen, video projector, PC, PowerPoint 2000®

    2. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 2 Risk Management and It’s Application at Diablo Canyon NPP (DCPP) The lecturer can substitute this presentation by other example more appropriate to the countryThe lecturer can substitute this presentation by other example more appropriate to the country

    3. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 3 Risk Management

    4. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 4 Definition of Rules Prescriptive-Based Rules These are rules that are based on arbitrary/judgmental assumptions taken to assess adequacy of plant response to certain bounding initiators. These arbitrary assumptions are often conservative to account for the knowledge and model uncertainties. For example, single failure criteria is a prescriptive rule which attempts to address the uncertainty about equipment unavailability by forcing at least two success paths for each function. Deterministic-Based Rules These are rules which are purely based on the deterministic analysis. For example, the amount of water required in the RWST for a PWR is usually based on the amount of water that is required to allow for recirculation via the sump. And the amount of water is calculated based on mechanistic calculations. Probabilistic-Based Rules These are rules that are based on probabilistic evaluation of the frequency of all possible initiators AND combination of deterministic and probabilistic evaluation of accident mitigating functions response to each (class of) initiators. The uncertainty in these rules can be statistically addressed. Defense-in-depth is an important consideration when implementing such rules.

    5. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 5 Long Term Seismic Plan PSA in 1988 LTSP is a full scope at power Level 1 PSA including External Events NRC staff issues SER on the DCPP Level 1 PSA (NUREG/CR-5726) DCPP IPE per Generic Letter 88-20 (Included Level 2 PSA) in 1991 DCPP IPEEE model (Update of External Events) in 1993 Living PSA program including updates in 1995, 1997, and 2001 Diablo Canyon NPP PSA Program Program History

    6. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 6 Diablo Canyon Power Plant Psa Program PSA APPLICATIONS IMPLEMENTED Maintenance Rule Configuration Risk Assessment (On-line Maintenance) Technical Specification Optimization Severe Accident Management Program Generation/Engineering Support Risk-Informed Inservice Inspection Motor Operated Valves DCPP RISK MODEL PROGRAM Configuration Control Program Risk-Informed Application Projects PSA Model Enhancements

    7. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 7 Diablo Canyon Power Plant Risk Management Program

    8. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 8 Diablo Canyon Power Plant PSA Program Major Elements of PSA Configuration Control PSA configuration control procedure PSA risk ranking procedure PSA risk assessment guidelines Periodic review of plant hardware and procedural changes Periodic update of PSA Model sub-models

    9. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 9 Diablo Canyon Power Plant PSA Program Risk Model Configuration Control Element

    10. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 10 Diablo Canyon Power Plant PSA Program Risk Insights Element

    11. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 11 Diablo Canyon Power Plant PSA Program Risk Insights Element

    12. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 12 Diablo Canyon Power Plant PSA Program Risk Insights Element

    13. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 13 Diablo Canyon Power Plant PSA Program Risk Insights Element Blends prescriptive and deterministic/probabilistic insights Considers factors outside the scope of PSA analyses Evaluates aggregate affects of all risk informed, performance based programs Provides an overall sanity check

    14. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 14 Diablo Canyon Power Plant Expert Panel Members and Responsibilities

    15. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 15 Diablo Canyon Power Plant PSA Program Conclusion

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