ML061790363

RIC 2006 Presentation - W4D - Gerry Sowers - Risk-Informed Activities - Status and Direction

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

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 VERDE PALO

PRA Standards

• Internal Events (ASME, RA-S-2002)

• External Events (ANS 58.21)

• Fire

• Low Power and Shutdown (ANS 58.22)

VERDE PALO

PVNGS Objective

• Maintain a PRA that is acceptable:

- For required applications

• Maintenance Rule

• ROP - MSPI

• Significance Determinations

- For Optional Applications

• AOT extensions

• Risk Informed ISI

• Valve Programs (MOVs, AOVs)

VERDE PALO

Whats Acceptable If I know what the target is, I can hit it!

(With enough practice.)

How do I Define the Target?

VERDE PALO

To Hit The Target Regulatory Guide 1.200 NRC Phased Approach PRA Quality - Phase II Application Specific Requirements Applicable Standards

• Internal Events

• Fire

• External Events

• Low Power and Shutdown Implementing Guidance

• EPRI

• Owners Group

• NRC PALO VERDE

The Perfect World Establish PRA Quality Requirements and all Verify PRA Meets applicable guidance Requirements - Make Any Necessary Changes Submit Application For Staff Approval NO PRA QUALITY Do Application Work ISSUES!

VERDE PALO

The Real World Use Peer Reviews and Do Application Work Available Industry Methods Documentation to Submit Application Develop PRA For Staff Approval Uh Oh!

Verify PRA Meets stablish PRA Quality Requirements - If PRA equirements and all Quality Issues then Do pplicable guidance Work Over!

VERDE PALO

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 VERDE PALO