ML072980664

10/24/2007 Meeting Presentation on Update on Generic Safety Issue 191 Plant Audits

ML072980664
Person / Time
Site:	Millstone, Salem, Oconee, Indian Point, Saint Lucie, Watts Bar, Prairie Island, North Anna, Waterford, San Onofre
Issue date:	10/24/2007
From:	Scott M L Office of Nuclear Reactor Regulation
To:
References
GL-04-002, GSI-191
Download: ML072980664 (10)

Text

1Update on Generic Safety Issue 191 Plant AuditsPresented by: Michael ScottOffice of Nuclear Reactor RegulationPresented to: Public Meeting on GSI-191October 24, 2007 2 Purpose of Presentation*Briefly summarize audit process*Discuss results to date*Discuss future plans 3 Audit Purposes*Increase effectiveness and efficiency of NRC and industry efforts to

address Generic Letter (GL) 2004-02 by:-promoting more timely issue resolution-promoting uniform treatment of issues-identifying issues early to promote consistent responses and stable

regulatory environment 4 Selection Criteria and Audit Plans*Approximately 10 audits to be conducted -all scheduled, in progress, or complete (status follows) *Emphasis is on adequacy of design and supporting analyses 5 GSI-191 AuditsJanuary 2008 St LucieDecember 2007 Indian Point In progressOctober 2007 Salem In progress July 2007North AnnaNearly completeJune 2007Waterford CompleteMarch 2007Oconee CompleteJanuary 2007 Millstone CompleteOctober 2006Prairie Island CompleteAug/Sep 2006San Onofre CompleteMarch 2006Watts BarReport StatusSite Visit Plant 6 Process*Documents requested in advance*"Snapshot"of completion status

• Usually 1 week or less onsite, 7-8 auditors

• Usually no requests for additional information (RAIs)

• Product is an audit report

• Draft open items to be visible soon after audit as publicly available memo -see PWR Sump Performance web page*Open items to be addressed by licensees in 12/31/07 GL 2004-02 responses (or by supplement, for last audits)*Reports to be public (after affected licensees and contractors verify nonproprietary) on NRC'ssump websiteNote: Inspection of installation of modifications at each plant not within scope (TI-2515/166) 7 Audit Results*As expected, a number of open items identified in each audit to date*Recent audits indicate affected licensees aware of issues at other plants and

addressing them*List of recent example issues follows -not all-inclusive 8 Issues Identified (1 or more plants)*Chemical effects still not addressed*In-vessel and ex-vessel downstream effects not fully addressed*Nonprototypicaldebris preparation for head loss testing*Weak justification for choice of surrogate debris*LPSI pump failure to stop 9 Issues Identified (Continued) *No evaluation of potential for vapor flashing*Some upstream water holdup mechanisms not considered*Head loss scaling for parameters other than temperature*Inadequate basis for assumptions regarding time-dependent debris

arrival 10 What do results show?*Progress has been made*Some areas not demonstrated to be close to successful completion*Licensee Generic Letter 2004-02 submittals need to provide confidence

issues such as those noted have been

addressed*Staff plans limited-scope audits in 2008 to address chemical and downstream effects