ML081840735

06/20/2008 NFPA-805 Workshop Handouts - Harris Fire PRA Lessons Learned

ML081840735
Person / Time
Site:	Harris
Issue date:	06/20/2008
From:	Miskiewicz D Nuclear Generation Group, Progress Energy Co
To:	Office of Nuclear Reactor Regulation
Shared Package
ML081840360	List: ML081840398 ML081840534 ML081840731 ML081840735 ML081840744
References
Download: ML081840735 (12)

Text

Harris Fire PRA Lessons LearnedDavid Miskiewicz NFPA-805 Public Workshop June 20, 2008 Slide 2 Lesson Categories Planning Execution Deliverables Submittal Implementation Slide 3 PlanningFire PRA scopeNFPA-805 Other applications (a4, SDP, etc.) Internal Events PRA R.G. 1.200 Component mapping Fire Protection/Safe Shutdown Fire zone data Cable routing data Circuit analysis Slide 4 Execution Dedicated in-house resourcesProject managementTechnical direction & supportManaging distractions Contractor support Special skillsSupplemental manpowerWalkdowns, data collection Interface with plant Fire protection SSAOperations Interface with regulators and industry Slide 5 Deliverables Fire PRA Baseline CDF and LERF Supporting Calculations (igf, etc.) Peer Reviews Self Assessment/Roadmap Application supportDelta-CDFs, LERFsUncertainty/Sensitivity study Address open F&Os Change evaluations MSOs and OMAs Slide 6 Deliverables Flow Chart Slide 7 Lessons Much more work than anticipated Defining/Understanding scopeCommunicating the expectations and status of input data and documentation Personnel turnover impacts Interpretation of guidance Evolving technology Interpretation of standard Managing data Managing task iterations Slide 8 Lessons-2 Screening tools enhancements Impacts of combined conservatisms Use of detailed fire modeling Limited benefit for source/tray HRR issues Hot Gas Layer developmentTarget selection for electrical cabinets Improved scoping tools would simplify the application of detailed fire modeling insights Updated guidance needed Slide 9 Lessons-3 Development of risk insightsSelecting risk metrics (ignition sources vs. equipment failures) Software limitations Modeling issues Quantification issues Cutset issues Model maintenance issues Interface with fire protection requirements Tracking of ignition sources/targets Update scope and frequency Slide 10 Lessons-4 Balancing schedule and resources Prioritizing resources SSA and PRA competing for same resources Combining tasksEffective communication Slide 11 Submittal & Implementation coming soon Slide 12 Questions