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
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ML081840360	List: ML081840398 ML081840534 ML081840731 ML081840735 ML081840744
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Download: ML081840735 (12)

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Harris Fire PRA Lessons Learned David Miskiewicz NFPA-805 Public Workshop June 20, 2008

Lesson Categories Planning Execution Deliverables Submittal Implementation Slide 2

Planning O Fire PRA scope Z NFPA-805 Z Other applications (a4, SDP, etc.)

O Internal Events PRA Z R.G. 1.200 Z Component mapping O Fire Protection/Safe Shutdown Z Fire zone data Z Cable routing data Z Circuit analysis Slide 3

Execution O Dedicated in-house resources Z Project management Z Technical direction & support Z Managing distractions O Contractor support Z Special skills Z Supplemental manpower Z Walkdowns, data collection O Interface with plant Z Fire protection Z SSA Z Operations O Interface with regulators and industry Slide 4

Deliverables O Fire PRA Z Baseline CDF and LERF Z Supporting Calculations (igf, etc.)

O Peer Reviews Z Self Assessment/Roadmap O Application support Z Delta-CDFs, LERFs Z Uncertainty/Sensitivity study Z Address open F&Os Z Change evaluations Z MSOs and OMAs Slide 5

Deliverables Flow Chart Slide 6

Lessons O Much more work than anticipated Z Defining/Understanding scope Z Communicating the expectations and status of input data and documentation Z Personnel turnover impacts Z Interpretation of guidance Z Evolving technology Z Interpretation of standard Z Managing data Z Managing task iterations Slide 7

Lessons-2 O Screening tools enhancements Z Impacts of combined conservatisms O Use of detailed fire modeling Z Limited benefit for source/tray HRR issues Z Hot Gas Layer development Z Target selection for electrical cabinets O Improved scoping tools would simplify the application of detailed fire modeling insights Z Updated guidance needed Slide 8

Lessons-3 O Development of risk insights Z Selecting risk metrics (ignition sources vs. equipment failures)

O Software limitations Z Modeling issues Z Quantification issues Z Cutset issues O Model maintenance issues Z Interface with fire protection requirements Z Tracking of ignition sources/targets Z Update scope and frequency Slide 9

Lessons-4 O Balancing schedule and resources O Prioritizing resources Z SSA and PRA competing for same resources Z Combining tasks O Effective communication Slide 10

Submittal & Implementation coming soon Slide 11

Questions Slide 12