ML061790363
| ML061790363 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 03/08/2006 |
| From: | Sowers G Arizona Public Service Co |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| Download: ML061790363 (8) | |
Text
P A
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E PRA Standards The View from Below (The Licensee Perspective)
Gerald Sowers PRA Section Leader Palo Verde Nuclear Generating Station RIC 2006 Session W4D Risk Informed Activities March 8, 2006
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E 2
PRA Standards
- Internal Events (ASME, RA-S-2002)
- External Events (ANS 58.21)
- Fire
- Low Power and Shutdown (ANS 58.22)
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E 3
PVNGS Objective
- Maintain a PRA that is acceptable:
- For required applications
- Maintenance Rule
- Significance Determinations
- For Optional Applications
- AOT extensions
- Risk Informed ISI
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E 4
Whats Acceptable If I know what the target is, I can hit it!
(With enough practice.)
How do I Define the Target?
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E 5
To Hit The Target NRC Phased Approach PRA Quality - Phase II Application Specific Requirements Regulatory Guide 1.200 Applicable Standards
- Internal Events
- Fire
- External Events
- Low Power and Shutdown Implementing Guidance
- EPRI
- Owners Group
- NRC
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E 6
The Perfect World Establish PRA Quality Requirements and all applicable guidance Verify PRA Meets Requirements - Make Any Necessary Changes Do Application Work Submit Application For Staff Approval NO PRA QUALITY ISSUES!
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The Real World Establish PRA Quality Requirements and all applicable guidance Verify PRA Meets Requirements - If PRA Quality Issues then Do Work Over!
Do Application Work Submit Application For Staff Approval Uh Oh!
Use Peer Reviews and Available Industry Methods Documentation to Develop PRA
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E 8
What I (We) Need
- Standards that validate current accepted methods, faster
- PVNGS has a Fire PRA, I would like to update it in 2006
- EPRI just released a new fire method I can use for guidance
- Fire Standard in 2007?
- Reg Guide 1.200 endorsement in ?
- I do not want to waste my 2006 effort on the wrong target.
- Consensus Methods
- Common Cause - Good, one way, one data set, good cooperation
- Loss of Offsite Power Initiating Event Frequency - Bad, a lot of good work, but too many individual efforts (EPRI, WOG, NRC)
- Application Specific - Phase II PRA Requirements