ML17004A049: Difference between revisions

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| author name =  
| author name =  
| author affiliation = Southern Nuclear Operating Co, Inc
| author affiliation = Southern Nuclear Operating Co, Inc
| addressee name = Orenak M D
| addressee name = Orenak M
| addressee affiliation = NRC/NRR/DORL/LPLII-1
| addressee affiliation = NRC/NRR/DORL/LPLII-1
| docket = 05000424, 05000425
| docket = 05000424, 05000425
| license number = NPF-068, NPF-081
| license number = NPF-068, NPF-081
| contact person = Orenak M D
| contact person = Orenak M
| document type = Meeting Briefing Package/Handouts, Slides and Viewgraphs
| document type = Meeting Briefing Package/Handouts, Slides and Viewgraphs
| page count = 9
| page count = 9
}}
}}
=Text=
{{#Wiki_filter:Vogtle 50.69 Enhancement Submittal
* Background
* Previous Review scopes
* Intentions of this submittal
* Seismic PRA model
* Peer Review Facts and Observations (F&Os)
* SPRA Adequacy 2
Vogtle 50.69 Background
* SNC requested pilot status 50.69 - Dec. 2010
* NRC granted VEGP pilot status - June 2011
* SNC 50.69 LAR submitted - Aug. 2012
* NRC approved VEGP 10 CFR 50.69 - Dec. 2014
* NRC 50.69 inspection - June 13- 30, 2016
* Inspection report provided to SNC Aug. 10, 2016
  - NO FINDINGS 3
Scope of Enhancement Submittal
* Replace Seismic Margins Approach with SPRA model insights
* No other changes to the currently approved risk categorization program RISC 1                          RISC 2 Safety Related          Non Safety Related High Safety                  High Safety Significance                Significance Safety Related          Non Safety Related Low Safety                  Low Safety Significance                Significance RISC 3                        RISC 4 RISC = Risk Informed Safety Class 4
Operating License Conditions Note: Unit 1 shown. Unit 2 is identical. See Amendment 155 5
Currently Approved Risk Categorization Tools
* Internal events PRA for internal risk
* Fire PRA for fire risk
* Seismic margin analysis for seismic risk <Update to SPRA>
  - Low risk contributor compared to other tools
* Individual Plant Examination of External Events (IPEEE) screening to asses risk from other external hazards (high winds external floods)
* Safety Plan to assess shutdown risk 6
Options to Address Contributions AREAS TO ADDRESS Internal        Fire      Seismic    Other    Shutdown Events Risk      Risk          Risk    External    Risk Events Risk O      Internal Events                              Other P    (including Seismic External Shutdown PRA                    PRA T      Internal    Fire                  Events PRA Flooding)    PRA I        PRA O                              Updated    Updated    S/D DID N                  FIVE        Seismic    IPEEE    Model via SSEL    Screening    EOOS S                              (SMA) 7
Seismic PRA Model
* High Quality SPRA model
  - PWROG Peer Review conducted November 2014
  - All F&Os have been dispositioned
* All SRs met at CC II per Addendum B of ASME/ANS Seismic PRA Standard
  - Sources of model uncertainty 8
Summary
* Long history of VEGP investment in 50.69
* 50.69 process has been extensively reviewed
* Intentions of this submittal
* NRC acceptance of SPRA in the Approved 50.69 Categorization process
* High quality Peer Reviewed model
* One aspect in the determination of safety significance in the Categorization process 9}}

Latest revision as of 10:44, 30 October 2019

Southern Nuclear - Vogtle 50.69 Enhancement Submittal Public Meeting Slides
ML17004A049
Person / Time
Site: Vogtle  Southern Nuclear icon.png
Issue date: 01/04/2017
From:
Southern Nuclear Operating Co
To: Michael Orenak
Plant Licensing Branch II
Orenak M
References
Download: ML17004A049 (9)
v • d • e


Text

Vogtle 50.69 Enhancement Submittal

  • Background
  • Previous Review scopes
  • Intentions of this submittal
  • Seismic PRA model
  • Peer Review Facts and Observations (F&Os)

Vogtle 50.69 Background

  • SNC requested pilot status 50.69 - Dec. 2010
  • NRC granted VEGP pilot status - June 2011
  • SNC 50.69 LAR submitted - Aug. 2012
  • NRC 50.69 inspection - June 13- 30, 2016
  • Inspection report provided to SNC Aug. 10, 2016

- NO FINDINGS 3

Scope of Enhancement Submittal

  • Replace Seismic Margins Approach with SPRA model insights
  • No other changes to the currently approved risk categorization program RISC 1 RISC 2 Safety Related Non Safety Related High Safety High Safety Significance Significance Safety Related Non Safety Related Low Safety Low Safety Significance Significance RISC 3 RISC 4 RISC = Risk Informed Safety Class 4

Operating License Conditions Note: Unit 1 shown. Unit 2 is identical. See Amendment 155 5

Currently Approved Risk Categorization Tools

  • Internal events PRA for internal risk
  • Fire PRA for fire risk
  • Seismic margin analysis for seismic risk <Update to SPRA>

- Low risk contributor compared to other tools

  • Individual Plant Examination of External Events (IPEEE) screening to asses risk from other external hazards (high winds external floods)
  • Safety Plan to assess shutdown risk 6

Options to Address Contributions AREAS TO ADDRESS Internal Fire Seismic Other Shutdown Events Risk Risk Risk External Risk Events Risk O Internal Events Other P (including Seismic External Shutdown PRA PRA T Internal Fire Events PRA Flooding) PRA I PRA O Updated Updated S/D DID N FIVE Seismic IPEEE Model via SSEL Screening EOOS S (SMA) 7

Seismic PRA Model

  • High Quality SPRA model

- PWROG Peer Review conducted November 2014

- All F&Os have been dispositioned

  • All SRs met at CC II per Addendum B of ASME/ANS Seismic PRA Standard

- Sources of model uncertainty 8

Summary

  • Long history of VEGP investment in 50.69
  • 50.69 process has been extensively reviewed
  • Intentions of this submittal
  • NRC acceptance of SPRA in the Approved 50.69 Categorization process
  • High quality Peer Reviewed model
  • One aspect in the determination of safety significance in the Categorization process 9
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