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Category:Meeting Briefing Package/Handouts
MONTHYEARML22251A2352022-09-14014 September 2022 Presentation Slides for September 14, 2022, Observation Public Meeting ML22130A0092022-04-28028 April 2022 Duke Presentation for April 28, 2022 Public Meeting - Bolting Integrity ML22130A0102022-04-28028 April 2022 Duke Presentation for April 28, 2022 Public Meeting - Containment Liner ML22067A1992022-03-0303 March 2022 Annual Assessment Meeting Presentation ML22063A1142022-01-17017 January 2022 Duke Presentation for Public Meeting on February 17, 2022 ML21235A0452021-08-25025 August 2021 August 25, 2021, Oconee Nuclear Station, Units 1, 2, and 3 Subsequent License Renewal Application Public Environmental Scoping Meeting Presentation ML21102A0632021-04-14014 April 2021 ONS Slides for Pre-Application Meeting to Discuss Proposed Relief Request Related to Code Case N-853 ML21089A1732021-03-30030 March 2021 EOC Slides Final ML21081A1242021-03-22022 March 2021 EOC Slides Final ML20300A0902020-10-27027 October 2020 Subsequent License Renewal Environmental Pre-Application Meeting - NRC Presentation ML20300A0872020-10-27027 October 2020 Subsequent License Renewal Application NRC Environmental Pre-Application Meeting - Duke Energy Presentation ML19318F2912019-11-18018 November 2019 Duke Energy Presentation for the Pre-submittal Meeting on November 18, 2019, Regarding the RPV Stud Examination Relief Request ML19302E0512019-11-0606 November 2019 High Energy Line Break License Amendment Public Meeting ML19214A0562019-08-0707 August 2019 Presentation: Duke Energy Presubmittal Meeting - August 7, 2019 ML19207A0172019-07-30030 July 2019 Summary of Meeting with Duke Energy Carolinas, LLC to Discuss Proposed License Amendment Request for Oconee Nuclear Station, Units 1, 2, and 3 Regarding High Energy Line Break Licensing Basis ML18227B3212018-09-0505 September 2018 Tornado License Amendment Pre-Application Meeting Slides ML18134A2292018-05-14014 May 2018 Summary of April 26, 2018, Public Teleconference with Duke Energy Carolinas, LLC to Discuss Proposed License Amendment and 3 Regarding Technical Specification 3.8.1 ML17258A0122017-09-26026 September 2017 Presentation Slide Regarding Committee to Review Generic Requirements Meeting on Oconee Nuclear Station Cable Separation TIA ML15348A2032015-12-14014 December 2015 Duke Energy Presentation in Support of December 15, 2015, Public Meeting with NRC Staff Cable Testing Discussion for Proposed 50.55a Alternative Request ML15343A1142015-12-0808 December 2015 NRC Questions to Duke Energy Regarding Cable Testing in Support of Public Meeting on 12/15/15 ML15321A1782015-11-17017 November 2015 Presentation Material in Support of November 18, 2015 Pre-Application Meeting Between NRC and Duke 50.55a(z) Alternative to Code and Standards Requirements ML15286A0762015-10-13013 October 2015 Duke Energy Presentation in Support of October 13, 2015, Public Meeting with NRC Staff Pre-Application Meeting for LAR to Support Khu Stator Replacement. (Revised) ML15282A0722015-10-0909 October 2015 Duke Energy Presentation in Support of October 13, 2015, Public Meeting with NRC Staff Pre-Application Meeting for LAR to Support Khu Stator Replacement ML15148A2632015-05-27027 May 2015 Meeting Slides from the May 27, 2015 Oconee Major Projects Between Duke Energy and NRC ML15113A6262015-04-23023 April 2015 April 14, 2015 Summary of Public Meeting on Oconee Nuclear Station, Units 1, 2 and 3 to Discuss the Annual Assessment ML14356A0062014-12-0303 December 2014 Presentation at December 3, 2014, Category 1 Public Meeting with Duke Energy Carolinas, LLC to Discuss NTTF Recommendation 2.1, Flooding Response ML14211A2132014-07-31031 July 2014 Duke Energy Presentation for 2014-07-31 Meeting ML14211A2162014-07-31031 July 2014 NRC Meeting Slides 7-31-14 Reg Conference ML14147A3652014-05-27027 May 2014 Annual Assessment Public Meeting Summary Memo ML14058A0772014-02-0404 February 2014 Slides on Oconee Ssf Flood Barrier Breach SDP Lessons Learned ML14058A0742014-02-0404 February 2014 Slides on Oconee Ssf Flood Barrier Breach SDP - Lessons Learned ML14058A0482014-02-0404 February 2014 NRR Briefing on Oconee Flood Protection (Nrr/Dra) ML13336A5452013-11-13013 November 2013 Presentation Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Keowee Hydro Unit Generator Field Pole Rewind Project - License Amendment Request ML13312A9882013-11-0808 November 2013 Summary of Public Meeting with Duke Energy Carolinas, LLC, to Provide Opportunities to Discuss the Planned Fukushima-Related Modifications ML13308A0072013-11-0101 November 2013 Open Phase Resolution Update Meeting Duke Energy Entitled Open Phase Detection and Protection. ML13275A2692013-10-0303 October 2013 10/3/13 Presentation Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Protected Service Water Alternate Cooling ML13275A2252013-09-24024 September 2013 9/24/13 Meeting Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Jocassee Dam Seismic Analysis ML13239A3372013-08-27027 August 2013 NRC Meeting Slides, Oconee Major Project Meeting - August 28, 2013 ML13239A3402013-08-27027 August 2013 Presentation for NRC Projects ML13099A4472013-04-10010 April 2013 Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Milestones for Corrective Actions for an Apparent Violation of a License Condition on Fire Protection ML13095A2132013-04-0909 April 2013 Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, External Flood Reevaluation ML13123A2042013-03-25025 March 2013 Slides from Meeting with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Concerning the Flooding Hazard Reevaluation Report ML13064A1022013-03-0505 March 2013 Slides from Predecisional Enforcement Conference with Duke Energy Carolinas, LLC, Oconee Nuclear Station Units 1, 2, and 3, Apparent Violation of a License Condition on Fire Protection ML13056A1042013-02-0606 February 2013 Briefing Slides on the Fliod Scenario Rupture of Jocassee Dam ML13056A1032013-02-0606 February 2013 Briefing on Draft Information Notice - Potential Nonconservative Screening Value for Dam Failure Frequency in Probabilistic Risk Assessments. ML13056A1022013-02-0606 February 2013 Meeting Slides on Oconee Flood Issue Jocassee Dam Failure Frequency ML13056A0992013-02-0606 February 2013 Meeting Slides on Oconee Ssf Flood Barrier Breach Sdsp - Lessons Learned ML13052A7822013-02-0606 February 2013 Slides on Oconee Ssf Flood Barrier Breach SDP - Lessons Learned ML13035A2442013-01-30030 January 2013 Projects Meeting - NRC Slides ML13035A2332013-01-30030 January 2013 Projects Meeting - Licensee'S Public Meeting Slides 2022-09-14
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' / O~~ffcil, ý$e nly - Sensiti/ve j**-S.NRC0--ntrnt Oconee Flood Protection and the 10 CFR 50.54() Response NRR LT Meeting October 21, 2008 October 21, 2008 1
U Pm.NRC
,I LAl COM \CU*11Interna Objectives Purpose
-Summarize the licensee's responses
-Discuss the staff's evaluation and options
-Discuss possible paths forward
-To receive LT feedback on the merits of possible paths forward October 21, 2008 2
t PmS.linR
-* L*I't IIInItera S
Background
II rmt" Duke Hydro/FERO Inundation Study completed inearly 1990s. Estimated flood heights up to 16.8 ft above SSF grade level
- First identified by inspectors in1994.
- Floods inexcess of 5ft lead to three-unit core damage event.
, Staff identified an under-estimate inlicensee's random dam failure frequency for Jocassee.
, Staff discovery that the Jocassee dam failure issue had not been adequately resolved.
, Issued 10 CFR 50.54(f) letter for Duke to address flooding concerns.
October 21, 2008 3
.NARC Principal 10 CFR 50.54(f Questions Regarding Oconee Flood 1.Explain the bounding external flood hazard at Oconee and the basis for excluding consideration of other external flood hazards, such as those described inthe Inundation Study, as the bounding case.
2.Provide your assessment of the Inundation Study and why itdoes or does not represent the expected flood height following a Jocassee Dam failure.
3.Describe indetail the nuclear safety implications of floods that render unavailable the SSF and associated support equipment with aconcurrent loss of all Alternating Current power.
October 21, 2008 4
\Unhcia us e Iy-ens ive
-US,NRC I
.,jnrnal I n Prokix;Propkaidt du Emnment 50.54(f Letter Review Team Scope
- Review submittal as ifNRC isreconstituting adesign basis flood for Oconee
- All modes/events causing external flooding will be assessed
- All modes/events causing Jocassee dam failure will be assessed s Topics considered indevelopment of.options:
- Likelihood of dam failure
- Flood analysis
- Seismology
- Basis for continued operation
- Security October 21, 2008 5
se Only - SeniTlive
NiedinghPopk .diEivrome, Overall Summary of Licensee's Response
, Inundation levels based on current drought conditions
-Supports continued operation
, Commitment to increase current flood walls to 7.5 feet by February 2009.
- Further analysis by February 2010.
, Heavy reliance on test and inspection of dam
, Seismic failure is"not credible" Other dam failure modes (i.e., overtopping) "not credible" October 21, 2008 6
IKUS.NRC frTLULAICOWW.u cvI UTUR u yeUHoov Overall Summary of Staff's Review of Licensee's
Response
Interim continued operation appears feasible with additional licensee commitment of water management Licensee failed to fully address site flood height (e.g,,
adequate protection)
- No analysis for random Jocassee Dam failure at full pond level
- An inadequate seismic analysis
- Did not perform a Probable Maximum Precipitation (PMP) analysis
, Future planned analysis for dam failure isnot acceptable
- Issues on time-to-failure, breach size, and choice of flood model
, Current and future reliance on probability arguments is not acceptable October 21, 2008 7
U.S.NRC '~K~nIIrt.j9 2 Options for Path Forward adt6 Euwoanma Izulicq Peapk
, Options represent choice between engineered and analytical approaches
- Installation of watertight doors to the SSF
- Has not been committed to by licensee
- Analysis was proposed by the licensee October 21, 2008 8
of Option 1
\ý I'dMUDITUDS UM [Li.IL*l ARIM CNMMlI.%*
h'°*a ped&Summary -
Engineered Solution (Installation of watertight doors)
Pros Cons
- Independent of all Licensee might delay sources of flood and acceptance of this inundation level solution
- Fully addresses adequate protection
- Fewer NRC staff resources required for inspections and review Timely and defensible to internal and external stakeholders October 21, 2008 9
- )UOSNRC Summary o Option 2 Further Analytical Solution Pros Cons s Improved estimate of flood , Aresolution timeframe may be prohibitive inundation level to define amount of protection to be
- Licensee has inappropriately eliminated failure modes applied High degree of uncertainty in s Licensee-proposed solution dam breach analysis Analysis plan for Feb. 2010 is not adequate
- Calculated inundation level may result ina further engineered solution
° Probability approach isnot acceptable
, Requires very extensive staff review resources October 21, 2008 ONfli e Iy-S sV, 10 Internal In rm ionn
. USNRC PmingPekpI Ui~ rownmt andW Outline of Presentation to Licensee on October 30, 2008 Management Meeting
, State basis for interim continued operation
. State NRC position on dam failure frequency (probability) argument
- NRC will not expend staff resources on an approach which will not contribute to asolution
- Licensee's proposed probability approach of eliminating failure modes with inappropriate bases isnot acceptable to NRC staff
- State NRC position on preferred option
, State regulatory vehicle to pursue
- An order
- AConfirmatory Action Letter October 21, 2008 11