ML081840735
| 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: |
| References | |
| Download: ML081840735 (12) | |
Text
Harris Fire PRA Lessons Learned David Miskiewicz NFPA-805 Public Workshop June 20, 2008
Slide 2 Lesson Categories Planning Execution Deliverables Submittal Implementation
Slide 3 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 4 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 5 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 6 Deliverables Flow Chart
Slide 7 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 8 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 9 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 10 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 11 Submittal & Implementation coming soon
Slide 12 Questions