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MONTHYEARML12363A1322008-08-15015 August 2008 Information Request Pursuant to 10 CFR 50.54(f) Related to External Flooding, Including Failure of the Jocassee Dam at Oconee Nuclear Station, Units 1, 2, and 3 Project stage: Other ML0816402442008-08-15015 August 2008 Information Request Pursuant to 10 CFR 50.54(F) Related to External Flooding, Including Failure of the Jocassee Dam at Oconee Nuclear Station, Units 1, 2, and 3 Project stage: Other ML0823906902008-08-26026 August 2008 Letter Kick Off for Risk Analysis of the Failure of the Jocassee and Keowee Dams to Assess the Potential Effects on the Safe Shutdown Facility at the Oconee Nuclear Station Project stage: Other ML0823906692008-08-26026 August 2008 E-mail Oconee Nuclear Station - Kick Off for Risk Analysis of the Failure of the Jocassee and Keowee Dams to Assess the Potential Effects on the Safe Shutdown Facility of ONS Project stage: Other ML0822501662008-09-0909 September 2008 Communication Plan for Information Request Related to Failure Frequencies for the Jocassee Pumped Storage Dam (Jocassee Dam) at the Oconee Nuclear Station and Potential Generic Implications Project stage: Other ML13121A3262008-09-0909 September 2008 Communication Plan for Information Request Pursuant to 10 CFR 50.54(f) Related to External Flooding, Including Failure of the Jocassee Dam, at Oconee Nuclear Station, Units 1, 2, and 3 Project stage: Other ML12326A3892008-09-0909 September 2008 Memorandum from E. Leeds, NRR to V. Ordaz, EDO on Communication Plan for Information Request Pursuant to 10 CFR 50.54(f) Related to External Flooding, Including Failure of the Jocassee Dam Project stage: Other ML0827501062008-09-26026 September 2008 Response to 10 CFR 50.54(f) Request Project stage: Other ML12363A1292008-09-26026 September 2008 Response to 10 CFR 50.54(f) Request Project stage: Other ML0833004272008-12-16016 December 2008 Summary of Closed Meeting to with Duke Energy Carolinas, LLC to Discuss the August 15, 2008, 50.54(f) Letter on External Flooding Project stage: Meeting ML0906807372009-03-13013 March 2009 Summary of Closed Meeting to Discuss the Duke Energy Carolinas, Llc., 09/26/08 Response to Nrc'S, August 15, 2008 50.54(f) Letter on External Flooding at Oconee Project stage: Meeting ML0911701042009-04-0606 April 2009 Non-concurrence on Evaluation of Duke Energy Carolinas, LLC September 26, 2008, Response to Nuclear Regulatory Commission Letter Dated August 15, 2008 Related to External Flooding Project stage: Acceptance Review ML0908204702009-04-22022 April 2009 Notice of Forthcoming Closed Meeting with Duke Energy Carolinas, LLC, to Discuss Sensitivity Studies Concerning Failure of the Jocassee Dam & Resultant Flooding at the Oconee Nuclear Station, Unit 1, 2, & 3 Project stage: Meeting ML12363A1332009-04-30030 April 2009 Evaluation of Duke Energy Carolina September 26, 2008, Response to 10 CFR 50.554(f), Letter Dated August 15, 2008, Related to External Flooding, Including Failure of the Jocassee Dam Project stage: Other ML0913804242009-05-11011 May 2009 Slides for Closing Meeting May 11, 2009 with Duke on the Oconee Flooding Issue Project stage: Request ML0914203192009-06-0101 June 2009 Meeting Summary, Meeting to Discuss External Flooding at Oconee Nuclear Station (Reissuance, with Error on Page 3 Corrected) Project stage: Meeting ML0910607612009-06-18018 June 2009 Summary of Closed Meeting with Duke on External Flooding Issues, Including Failure of the Jocassee Dam, at Oconee Nuclear Station, Units 1, 2, and 3 Project stage: Meeting ML0916206692009-07-0909 July 2009 Summary of Closed Meeting with Duke Carolina to Discuss External Flooding at Oconee Project stage: Meeting ML0929407692009-11-10010 November 2009 Summary of Closed Meeting with Duke Energy Carolinas, LLC, to Discuss Preliminary Results of the Recent Inundation and Sensitivity Studies Concerning Failure of the Jocassee Dam and Resultant Flooding at Oconee Nuclear Station, 1, 2, and 3 Project stage: Meeting ONS-2016-001, Transmittal of Supplemental Information Regarding NRC 2008 and 2012 Requests for Information, Pursuant to 10 Cer 50.54(f) Pertaining to External Flooding - Revision 12016-01-0808 January 2016 Transmittal of Supplemental Information Regarding NRC 2008 and 2012 Requests for Information, Pursuant to 10 Cer 50.54(f) Pertaining to External Flooding - Revision 1 Project stage: Supplement 2009-04-22
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Category:Letter
MONTHYEARML23304A1422024-02-0101 February 2024 Issuance of Environmental Scoping Summary Report Associated with the U.S. Nuclear Regulatory Commission Staffs Review of the Oconee Nuclear Station, Units 1, 2, & 3, Subsequent License Renewal Application ML24005A2492024-01-24024 January 2024 Exemption from Select Requirements of 10 CFR Part 73 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting) IR 05000269/20243012024-01-11011 January 2024 Notification of Licensed Operator Initial Examination 05000269/2024301, 05000270/2024301, and 05000287/2024301 ML23331A7982023-12-14014 December 2023 Review of the Fall 2022 Steam Generator Tube Inspection Report (01R32) ML23262A9672023-12-13013 December 2023 Alternative to Use RR-22-0174, Risk-Informed Categorization and Treatment for Repair/Replacement Activities in Class 2 and 3 Systems Section XI, Division 1 IR 05000269/20230032023-11-14014 November 2023 Integrated Inspection Report 05000269/2023003, 05000270/2023003, and 05000287/2023003; and IR 07200040/2023001; and Exercise of Enforcement Discretion ML23317A3462023-11-14014 November 2023 Duke Fleet - Correction Letter to License Amendment Nos. 312 & 340 Issuance of Amendments Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-554, Revision 1 ML23219A1402023-10-10010 October 2023 Audit Report Proposed Alternative to Use ASME Code Case N-752, Risk Informed Categorization and Treatment for Repair/Replacement Activities in Class 2 and 3 Systems XI, Division 1 ML23269A1102023-10-0606 October 2023 Letter to Steven Snider-Revised Schedule for the Environmental Review of the Oconee Nuclear Station, Unit 1, 2, and 3, Subsequent License Renewal Application ML23256A0882023-09-25025 September 2023 Issuance of Alternative to Steam Generator Welds ML23195A0782023-08-29029 August 2023 Issuance of Amendments Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-554, Revision 1 IR 05000269/20230112023-08-25025 August 2023 Comprehensive Engineering Team Inspection Report 05000269/2023011 and 05000270/2023011 and 05000287/2023011 IR 05000269/20230052023-08-25025 August 2023 Updated Inspection Plan for Oconee Nuclear Station Units 1, 2 and 3 (Report 05000269/2023005, 05000270/2023005, and 05000287/2023005) IR 05000269/20230022023-07-28028 July 2023 Integrated Inspection Report 05000269/2023002, 05000270/2023002 and 05000287/2023002 ML23208A0972023-07-27027 July 2023 Subsequent License Renewal List of Threatened and Endangered Species That May Occur in Your Proposed Project Location or May Be Affected IR 05000269/20230102023-07-19019 July 2023 Biennial Problem Identification and Resolution Inspection Report 05000269/2023010 and 05000270/2023010 and 05000287/2023010 and Notice of Violation ML23178A0682023-07-0303 July 2023 Audit Plan Proposed Alternative to Use ASME Code Case N-752, Risk-Informed Categorization and Treatment for Repair/Replacement Activities in Class 2 & 3 Systems Section XI, Division 1 ML23132A2392023-06-0101 June 2023 Summary of the April 2023 Remote Environmental Audit Related to the Review of the Subsequent License Renewal Application ML23144A0192023-05-25025 May 2023 Review of the Spring 2022 Steam Generator Tube Inspection Report (O3R31) IR 05000269/20230012023-05-12012 May 2023 Integrated Inspection Report 05000269/2023001 and 05000270/2023001 and 05000287/2023001 ML23121A0552023-05-0303 May 2023 Acknowledgement of Withdrawal Request to Revise TS 5.5.2 Containment Leakage Rate Testing Program ML23118A0762023-05-0101 May 2023 Approval for Use of Specific Provision of a Later Edition of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section XI ML23117A0432023-04-20020 April 2023 Framatome, Inc., Part 21 Notification of Existence of a Defect ML23075A0732023-04-0505 April 2023 License Renewal Regulatory Audit Regarding the Environmental Review of the Subsequent License Renewal Application Supplement (EPID Number L-2021-SLE-0002) ML23045A1332023-03-15015 March 2023 Request for Scoping Comments Concerning the Supplemental Environmental Review of Oconee Nuclear Station, Units 1, 2, and 3, Subsequent License Renewal Application - Achp Letter ML23045A1402023-03-15015 March 2023 Request for Scoping Comments Concerning the Supplemental Environmental Review of Oconee Nuclear Station, Units 1, 2, and 3, Subsequent License Renewal Application - Shpo Letter ML23045A1432023-03-15015 March 2023 Request for Scoping Comments Concerning the Supplemental Environmental Review of Oconee Nuclear Station, Units 1, 2, and 3, Subsequent License Renewal Application - State Tribe Letter ML23069A1102023-03-10010 March 2023 Notification of Inspection and Request for Information for NRC Problem Identification and Resolution Inspection ML22332A4932023-03-10010 March 2023 William States Lee III 1 and 2 - Issuance of Amendments Regarding the Relocation of the Emergency Operations Facility ML23061A1772023-03-0303 March 2023 Notification of Oconee Nuclear Station Comprehensive Engineering Team Inspection - NRC Inspection Report 05000269/2023011, 05000270/2023011 and 05000287/2023011 IR 05000269/20220062023-03-0101 March 2023 Annual Assessment Letter for Oconee Nuclear Nuclear Station, Units 1, 2 and 3 (NRC Inspection Report 05000269/2022006, 05000270/2022006, and 05000287/2022006) ML23039A1632023-02-0808 February 2023 Requalification Program Inspection ML23037A0772023-02-0606 February 2023 402 Cyber Notification and RFI Letter Final IR 05000269/20220042023-02-0202 February 2023 Integrated Inspection Report 05000269 2022004 and 05000270/2022004 and 05000287/2022004 ML22363A3942023-01-12012 January 2023 Subsequent License Renewal Environmental Report Supplement - Proposed Review Schedule ML22356A0512022-12-14014 December 2022 Curtiss-Wright Nuclear Division, Letter Regarding Potential Efect in a Configuration of the 11/2 Inch Quick Disconnect Connector Cable Assemblies Supplied to Duke Energy (See Attached Spreadsheet) for a Total of 460 of Connectors Only Suppl ML22321A0492022-12-0808 December 2022 Issuance of Amendment Nos. 426, 428 and 427, Additional Mode Change Limitations Applicable to the Adoption of TSTF- 359, Revision 9, Increase Flexibility in Mode Restraints ML22329A1042022-11-29029 November 2022 Review of the Fall 2021 Steam Generator Tube Inspection Report ML22321A1582022-11-22022 November 2022 Summary of Conference Call Regarding the Fall 2022 Steam Generator Tube Inspections ML22096A0032022-11-18018 November 2022 McGuire Nuclear Station and Shearon Harris Nuclear Power Plant Authorization of RA-19-0352 Regarding Use of Alternative for RPV Head Closure Stud Examinations ML22256A2532022-11-14014 November 2022 Issuance of Amendments Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-541, Rev. 2 IR 05000269/20220032022-11-0707 November 2022 Integrated Inspection Station 05000269/2022003 and 05000270/2022003 and 05000287/2022003 ML22301A0112022-11-0303 November 2022 Request for Withholding Information from Public Disclosure Regarding the SLR Application - September 2, 2022 ML22298A0752022-10-27027 October 2022 Request for Withholding Information from Public Disclosure Regarding the Subsequent License Renewal Application Duke Energy Letter Dated July 25, 2022 ML22264A0322022-10-20020 October 2022 _Request for Withholding Information from Public Disclosure Regarding the Subsequent License Renewal Application - Duke Energy Letter Dated July 8, 2022 IR 05000269/20220112022-09-26026 September 2022 NRC Inspection Report 05000269/2022011 and 05000270/2022011 and 05000287/2022011 ML22258A0302022-09-15015 September 2022 Evacuation Time Estimate Reports ML22222A0072022-09-14014 September 2022 Request for Withholding Information from Public Disclosure Regarding the Subsequent License Renewal Application ML22231B1362022-09-0101 September 2022 Review of the Draft Environmental Assessment and Findings of No Significant Impact for Catawba Nuclear Station, H.B. Robinson Steam Electric Plant, and Oconee Nuclear Station Independent Spent Fuel Storage Installation Decommissioning Fundi 2024-02-01
[Table view] Category:Meeting Summary
MONTHYEARML23118A2852023-05-0202 May 2023 Public Meeting Summary - 2022 Annual Assessment Meeting Regarding Catawba Nuclear Station, McGuire Nuclear and Oconee Nuclear Station ML22200A0772022-08-0808 August 2022 SLRA - Summary of July 14, 2022 and July 28, 2022 Public Meetings ML22193A0182022-07-18018 July 2022 SLRA - Summary of June 30, 2022 Public Meeting ML22129A0062022-05-10010 May 2022 Summary of April 20, 2022, Meeting with Duke Energy Progress, LLC, to Discuss Proposed License Amendment Request to Revise Reactor Coolant System Pressure Isolation Valve Operational Leakage Surveillance Requirement Frequency (L-2022-LRM 00 ML22130A0122022-05-0404 May 2022 SLRA - Summary of April 28, 2022 Public Meeting ML22124A2052022-05-0404 May 2022 Summary of May 4, 2022, Clarification Call with Duke Energy Carolinas, LLC, Application to Revise TS 3.7.7, Low Pressure Service Water (LPSW) System ML22075A2042022-04-0505 April 2022 SLRA - Summary of March 7, 2022 Public Meeting ML22094A1112022-04-0404 April 2022 Public Meeting Summary 2021 Annual Assessment Meeting Catawba Dockets Nos. 50-413 and 50-414; McGuire No. 50-369 and 50-370; Oconee. 50-269, 50-270, and 50-287 ML22084A6142022-04-0404 April 2022 SLRA - Summary of March 16, 2022 (Closed Public Meeting) ML22063A1162022-03-0808 March 2022 SLRA - Summary of Public Meeting Dated February 17, 2022 ML21341A5542021-12-29029 December 2021 Summary of November 29, 2021, Meeting with Duke Energy Progress, LLC and Duke Energy Carolinas, LLC to Discuss a Planned License Amendment Request to Relocate ML21348A5452021-12-14014 December 2021 December 13, 2021, Clarification Call Summary Use of an Alternative to the ASME Code Case N-853 Acceptance Criteria ML21279A1542021-11-0808 November 2021 August 25, 2021, Oconee Nuclear Station, Units 1, 2, and 3 Subsequent License Renewal Application Public Environmental Scoping Meeting Summary Memo ML21279A1192021-08-25025 August 2021 August 25, 2021, Oconee Nuclear Station, Units 1, 2, and 3 Subsequent License Renewal Application Public Environmental Scoping Meeting Summary ML21195A2712021-07-14014 July 2021 Meeting Summary: Pre-Submittal Meeting for the Oconee Subsequent License Renewal Application (EPID Number: L-2020-RNW-0028) (Docket Numbers: 50 269, 50-270, and 50-287) - Summary ML21195A2692021-07-14014 July 2021 Meeting Summary: Pre-Submittal Meeting for the Oconee Subsequent License Renewal Application (EPID Number: L-2020-RNW-0028) (Docket Numbers: 50 269, 50-270, and 50-287) - Memo ML21102A0612021-04-27027 April 2021 April 14, 2021, Meeting Summary Regarding Pre-Application Meeting to Discuss Proposed Relief Request Related to Code Case N-853 ML21099A0932021-04-0909 April 2021 Public Meeting Summary - 2020 Annual Assessment Meeting Regarding Catawba, McGuire, and Oconee Nuclear Stations ML20266G2192020-11-0303 November 2020 Regulatory Audit Report Regarding License Amendment Request to Revise the Licensing Basis for High Energy Line Breaks Outside of the Containment Building ML20141L4172020-05-20020 May 2020 EOC Public Meeting Summary ML19331A5202019-12-12012 December 2019 Summary of Meeting with Duke Energy Carolinas, LLC to Discuss Submitted License Amendment Request for Oconee Nuclear Station, Units 1, 2, and 3 Regarding High Energy Line Break Licensing Basis ML19220A6702019-08-26026 August 2019 Summary of August 7, 2019, Meeting with Duke Energy Progress, LLC and Duke Energy Carolinas, LLC to Discuss a Proposed License Amendment Request for a Common Emergency Plan 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 ML19102A3352019-04-12012 April 2019 Public Meeting Summary - Oconee Nuclear Station Docket Nos. 50-269, 50-270, and 50-287 ML19087A0622019-04-11011 April 2019 Summary of March 25, 2019, Public Teleconference with Duke Energy to Discuss the Request for Additional Information Response Regarding the Proposed Alternative to the Depth Sizing Qualification Requirement (Duke Energy Fleet Relief Request ML18227B2122018-09-0505 September 2018 Summary of August 1, 2018, Meeting with Duke Energy Carolinas, LLC to Discuss Proposed License Amendment Request for Oconee Nuclear Station, Units 1, 2, and 3 Regarding Tornado Mitigation Licensing Basis 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 ML18082A1082018-03-29029 March 2018 Summary of February 28, 2018, Meeting with Duke Energy Carolinas, LLC to Discuss Proposed LAR Regarding Tornado Mitigation Licensing Basis ML18082A0582018-03-23023 March 2018 Summary of Meeting with Oconee Nuclear Station to Discuss Annual Assessment of Oconee for the Period of January 01, 2017 - December 31, 2017 ML17179A3472017-07-18018 July 2017 Summary of Meeting with Duke Energy Carolinas, LLC to Discuss Proposed License Amendment Request for Oconee Nuclear Station, Units 1, 2, and 3 Regarding Thermal Margin for the Standby Shutdown Facility ML17103A0292017-04-13013 April 2017 Summary of Meeting to Provide Opportunities to Discuss Annual Assessment of Oconee Nuclear Station Units 1, 2 and 3 ML16166A4022016-06-27027 June 2016 Summary of November 18, 2015, and December 15, 2015, Meetings with Duke Energy Carolinas, LLC to Discuss a Proposed Relief Request in Accordance with 10 CFR 50.55a(z) for the Oconee Nuclear Station, Units 1, 2, and 3 ML16132A4352016-05-20020 May 2016 Summary of October 13, 2015, Meeting with Duke Energy Carolinas, LLC to Discuss Proposed LAR to Support Keowee Dam Stator Replacement ML15161A4312015-06-19019 June 2015 Summary of Meeting with Duke Energy Carolinas, LLC, to Discuss Ongoing Major Projects at Oconee Nuclear Station, Units 1, 2 and 3 ML15089A1642015-04-27027 April 2015 Summary of February 25, 2015, Partially Closed Meeting with Industry Stakeholders Regarding the Babcock and Wilcox Loss of Coolant Accident Evaluation Model Analysis 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 ML14356A0052014-12-31031 December 2014 Summary of December 3, 2014, Category 1 Public Meeting with Duke Energy Carolinas, LLC to Discuss NTTF Recommendation 2.1, Flooding Response for Oconee Nuclear Station, Units 1, 2, and 3 ML14147A3652014-05-27027 May 2014 Annual Assessment Public Meeting Summary Memo ML14069A3492014-03-13013 March 2014 Summary of Meeting with Duke Energy Carolinas, LLC, to Discuss Ongoing Major Projects at Oconee Nuclear Station, Units 1, 2, and 3 ML13336A5982013-12-0404 December 2013 Summary of Meeting with Duke Energy Carolinas, LLC, to Discuss the Proposed One-time TS Completion Time Change to Perform Khu Generator Field Pole Rewind Maintenance - Oconee Nuclear Station Units 1, 2, and 3 (TAC Nos. ME9021, ME9022, and M ML13312A9882013-11-0808 November 2013 Summary of Public Meeting with Duke Energy Carolinas, LLC, to Provide Opportunities to Discuss the Planned Fukushima-Related Modifications ML13281A5412013-10-21021 October 2013 9/24/2013 - Oconee Nuclear Station, Units 1, 2, and 3, Summary of Meeting with Duke Energy Carolinas, LLC, to Discuss the Jocassee Dam Seismic Analysis ML13281A6972013-10-21021 October 2013 10/3/13 Summary of Meeting with Duke Energy Carolinas, LLC to Discuss the Protected Service Water System Operation - Oconee Nuclear Station Units 1, 2, and 3 (TAC Nos. ME7737, ME7738, ME7739, ME7746, ME7747, and ME7748) ML13241A4482013-08-29029 August 2013 August 28, 2013 Summary of Public Meeting - Major Projects Status Meeting with Oconee ML13225A2932013-08-12012 August 2013 7/23-24/2013, Summary of Meeting 2013 U.S. Nuclear Regulatory Commission (NRC) Initial Exam Writers' Workshop ML13134A5232013-05-14014 May 2013 5/9/2013 Summary of Public Meeting with Duke Energy Corp., Oconee Nuclear Station to Provide Opportunities to Discuss the Annual Assessment for the Year 2012 ML13122A1912013-05-0606 May 2013 Summary of 04/10/13, Meeting with Duke Energy Carolinas, LLC, to Discuss Milestones Related to an Apparent Violation of License Conditions on Fire Protection (EA-13-010) ML13122A4362013-05-0606 May 2013 Summary of April 9, 2013, Meeting with Duke Energy Carolinas, LLC, to Discuss the Re-evaluation of External Flooding for Oconee Nuclear Station, Units 1, 2, and 3 ML13092A3632013-04-0404 April 2013 3/25/2013 - Oconee Nuclear Station, Units 1, 2, and 3 - Summary of Meeting with Duke Energy Carolinas, LLC, to Discuss the Flood Hazard Reevaluation Report ML13072A4262013-03-18018 March 2013 3/5/13 Summary of Meeting with Oconee Nuclear Station, Units 1, 2, and 3 - Predecisional Enforcement Conference Summary 2023-05-02
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OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION June 1, 2009 Mr. Dave Baxter Vice President, Oconee Site Duke Energy Carolinas, LLC 7800 Rochester Highway Seneca, SC 29672
SUBJECT:
OCONEE NUCLEAR STATION, UNITS 1, 2, AND 3 (OCONEE), REISSUANCE OF THE MARCH 13, 2009, MEETING
SUMMARY
CONCERNING EXTERNAL FLOODING AT OCONEE (TAC NOS. MD8224, MD8225, AND MD8226)
Dear Mr. Baxter:
On March 13, 2009, the U.S. Nuclear Regulatory Commission (NRC) issued a summary of the closed meeting held on December 4, 2008, between the NRC to Duke Energy Carolinas, LLC.
The meeting was to discuss external flooding events at Oconee. The NRC staff discovered an error in the summary. On page 3, paragraph 3, line 7 the word not was inadvertently left out of the sentence. The line should read, included in the NRC staffs evaluation, but did not reach consensus on the population of failures. Enclosed is the corrected meeting summary with a bar on page 3 showing on which line the change was made.
If you have any questions, please call me at 301-415-1345.
Sincerely,
/RA/
John Stang, Senior Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-269, 50-270, and 50-287
Enclosure:
Corrected Meeting Summary w/Attendee List OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION
OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION Mr. Dave Baxter Vice President, Oconee Site Duke Energy Carolinas, LLC 7800 Rochester Highway Seneca, SC 29672
SUBJECT:
OCONEE NUCLEAR STATION, UNITS 1, 2, AND 3 (OCONEE), REISSUANCE OF THE MARCH 13, 2009, MEETING
SUMMARY
CONCERNING EXTERNAL FLOODING AT OCONEE (TAC NOS. MD8224, MD8225, AND MD8226)
Dear Mr. Baxter:
On March 13, 2009, the U.S. Nuclear Regulatory Commission (NRC) issued a summary of the closed meeting held on December 4, 2008, between the NRC to Duke Energy Carolinas, LLC.
The meeting was to discuss external flooding events at Oconee. The NRC staff discovered an error in the summary. On page 3, paragraph 3, line 7 the word not was inadvertently left out of the sentence. The line should read, included in the NRC staffs evaluation, but did not reach consensus on the population of failures. Enclosed is the corrected meeting summary with a bar on page 3 showing on which line the change was made.
If you have any questions, please call me at 301-415-1345.
Sincerely,
/RA/
John Stang, Senior Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-269, 50-270, and 50-287
Enclosure:
Corrected Meeting Summary w/Attendee List DISTRIBUTION:
NON-PUBLIC RidsNrrPMJStang Resource R. Pichumani, NRR RidsNrrDss Resource RidsNrrLpl 2-1 R/F RidsAcrsAcnw_MailCTR Resource RidsNrrDe Resource RidsNrrDra Resource R. Carroll, DRP RidsRgn2MaiICenterResource RidsNrrDorlLpl2-1 Resource K. Manoly, NRR RidsNrrLAMO'Brien RidsNrrAdes Resource J. Vail, NRR M. Franovich, NRR RidsNrrDorl Resource S. Campbell, EDO Region II M. Galloway, NRR K. See, NRO D. Skeen, NRR R. Schaaf, NRO G. Bagchi, NRO E. Riggs, Region II RidsNrrDpr Resource C. Tucci, NRR RidsOgcRp Resource B. Davis ADAMS Accession No. ML091420319 OFFICE LPL2-1/PM LPL2-1/LA LPL2-1/BC NAME JStang MOBrien MWong DATE 06/01/09 06/01/09 06/01/09 OFFICIAL AGENCY RECORD OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION
OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION March 13, 2009 LICENSEE: DUKE ENERGY CAROLINAS, LLC FACILITY: OCONEE NUCLEAR STATION, UNITS 1, 2, AND 3
SUBJECT:
SUMMARY
OF CLOSED DECEMBER 4, 2008, MEETING TO DISCUSS THE DUKE ENERGY CAROLINAS, LLCs, SEPTEMBER 26, 2008, RESPONSE TO THE U.S. NUCLEAR REGULATORY COMMISSIONS, AUGUST 15, 2008, 50.54(f) LETTER ON EXTERNAL FLOODING AT OCONEE NUCLEAR STATION (TAC NOS. MD8224, MD8225, AND MD8226)
On December 4, 2008, the U.S. Nuclear Regulatory Commission (NRC) had a closed meeting with Duke Energy Carolinas, LLC (Duke, the licensee) to allow a technical exchange between the NRC staff and the licensees staff to discuss the licensees September 26, 2008, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML082750106), response to the NRCs August 15, 2008, Title 10 of the Code of Federal Regulations (10 CFR), Section 50.54(f) letter (ADAMS Accession No. ML081640244) on external flooding at Oconee Nuclear Station. A copy of the slides presented by the NRC staff is available under (ADAMS Accession No. ML090480058). A copy of the slides presented by the licensee is available under (ADAMS Accession No. ML090480044). Enclosed is a list of the meeting attendees.
The meeting was opened with introductions of the NRC staff and licensee personnel in attendance. The meeting was closed to the public.
Melanie Galloway, Deputy Director of the Division of Risk Assessment in the Office of Nuclear Reactor Regulation, opened the meeting by stating the meetings purpose and objectives:
(1) Provide the NRC staff an opportunity to discuss specific technical concerns, as introduced at the November 5, 2008, meeting, about the licensees proposed analyses, (2) Provide the licensee an opportunity to address NRC staffs concerns and provide technical details on the analytical approach outlined in its September 26, 2008, response to the 50.54(f) letter and the previous November 5, 2008, meeting between the NRC staff and the licensee, and (3) Reach alignment with the licensee on a path forward.
Specifically, Ms. Galloway noted that the NRC expressed concerns, at the November 5, 2008, meeting, that the licensees assessment of the breach parameters used appeared to be Enclosure OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION
OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION non-conservative, that the probabilistic approach did not appear to provide a success path, and that conclusions regarding non-credible seismic failure and overtopping did not to be appear supported. Ms Galloway also reiterated the timeframe for resolution conveyed at the November 5, 2008, meeting, that is, one year for technical resolution and one year for completing further modifications to the plant, if necessary.
Issues associated with the design and construction of the Jocassee Dam, and potential on-site flooding of Oconee Nuclear Station, were discussed between the NRC staff and the licensee during the meeting, including: (1) failure modes and analyses of the Dams, generically and specifically, as they relate to the Jocassee Dam, (2) inundation analyses for the Oconee Nuclear Station, (3) seismic and civil/structural analyses for the Jocassee Dam, (4) status and content of procedures for responding to a flooding event at the Oconee Nuclear Station, and (5) status of engineered solution analyses for the resolution of the flooding issues at the Oconee Nuclear Station.
Failure Modes and Analyses of the Dams In introducing this topic, Ms. Galloway noted that the NRCs regulatory requirements for demonstrating adequate protection against external flooding are deterministic in nature.
Therefore, the licensee needs to consider dam failures, including probable maximum flood (PMF) and seismic failures, and demonstrate that the Oconee Nuclear Station site is protected from the effects of such floods. Ms. Galloway further noted that the licensee would need to demonstrate a probability of failure of the Jocassee Dam 1E-7 or less, to consider a failure to be incredible.
The licensee stated that since the Jocassee Dam was seismically designed and was constructed to high standards, upstream dam failures were not considered in determining external flood threats to the Oconee Nuclear Station site.
The NRC staff responded that if the probability of a random failure of the Jocassee Dam was 1E-7 or less, it would not have to be considered as part of Oconees licensing basis.
The licensee presented information with respect to the core damage frequency of 1E-4 (CDF) estimate performed by the NRC staff. The licensee stated that the NRC staffs estimate does not include evaluation of individual initiating events and defense-in-depth measures that apply to each dam. The licensee further stated that the NRC staffs evaluation does not reflect current design conditions nor maintenance and operational practices that are the existing conditions at any specific site that would decrease or increase risk exposure. In the licensees view, the NRC staffs evaluation provided no risk insights.
The licensee stated it has commissioned a risk study with Utah State University to be completed by February 2010, to determine appropriate dam failure probabilities and resulting inundation OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION
OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION levels. The licensee stated that it will evaluate engineered solutions, as appropriate, once realistic and reasonable design inputs are determined.
The licensee presented information that unsafe dams are those in poor material condition or with deficiencies in design or construction that leave them susceptible to failure. The licensee stated that the common reasons for unsafe dams include: (1) inadequate spillway capacity/poor gate reliability, (2) excessive seepage/piping, and (3) inadequate seismic capacity.
The licensee presented information on the design and operation of the Jocassee Dams spillways and spillway gates. The licensee stated the Jocassee Dam spillway gates are designed similarly to most industry radial gates; they are not unique. The Keowee Dams 4 spillway gates are identical to the Jocassee Dams spillway gates and have been used to pass several flood events. The licensee described the maintenance and testing of the spillway gates, as well as other components of the dam as required by the Federal Energy Regulatory Commission (FERC). The NRC staff questioned whether the licensee inspects for cracks. The licensee responded that visual inspections are performed and none have been found.
The licensee indicated that risk assessment tools should be used by the dam safety community to consider both the potential failure modes and the relative quality of the design, maintenance, and operation of a dam in quantifying its failure probability. The NRC staff presented preliminary results of its independent evaluation showing that the random failure probability for rock-fill dams including Jocassee Dam was in the range of 1E 1E-5. The NRC staff and the licensee discussed the evaluation, specifically about the population of dam failures that were included in the NRC staffs evaluation, but did not reach consensus on the population of failures that should be included in the evaluation.
The NRC staff raised concerns with the licensees plan to perform a probabilistic risk study to eliminate random failures of the Jocassee Dam. The NRC staff noted it was unlikely that the study could prove random failure probability of the Jocassee Dam is less than 1E-7.
Inundation Analyses for the Oconee Nuclear Station Site During the meeting, the licensee presented the following information concerning the new inundation study it will be performing for a random failure of the Jocassee Dam:
(1) The HEC-RAS model will be used instead of the 1992 Dam Break (DAMBRK) Inundation model that the licensee ran for FERC.
(2) The new model will be from Jocassee Dam to Lake Hartwell, sufficiently below the Keowee Dam so that the sensitivity of the Keowee Tailrace is insignificant.
(3) The HEC-RAS model will have many more cross sections between Jocassee and Keowee Dams than the original model, providing more definition to the topography.
OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION
OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION (4) The HEC-RAS model will have more cross sections between the Keowee Dam and the control point than the original model, providing more downstream topographic detail.
(5) Large tributaries along Keowee and the Little River arm of Lake Keowee will be modeled as storage areas, unlike the original model.
(6) The model will use the same breach sizes as the 1992 study for both Jocassee and Keowee Dams.
(7) The HEC-RAS model will assume Keowee Dam fails due to overtopping.
(8) The HEC-RAS model will be a random sunny day break of Jocassee Dam in order to compare the model sensitivity conversion.
During the presentation, the NRC staff raised a number of concerns with assumptions used by the licensee and as a result, requested additional information as documented later in the meeting summary. The major concerns raised by the NRC staff include:
(1) Regarding breach size, the NRC staff was concerned with the limited breaching data. The NRC staff further noted that the breaching process was not well understood and that great uncertainty exists in the breach parameters used and the resultant outflow hydrograph.
The NRC staff further stated that breach parameters affect flood height at the Oconee Nuclear Station site and, the licensee should consider using breach widths of 575, 700, 800, 900 and 1100 feet in the sensitivity study.
(2) Regarding the time to failure, the NRC staff noted that the time considered may not be conservative. The NRC staff recommended dam failure times of 1, 2, 3 and 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> be used in the sensitivity study. The NRC staff cautioned that not considering that the Keowee Dam does not fail following failure of the Jocassee Dam may affect flood height at the Oconee Nuclear Station site.
(3) Regarding the sensitivity analysis, the NRC staff noted that the licensees assumptions may not be conservative and further recommended larger breach sizes and earlier dam failure times be considered in the sensitivity study.
(4) Regarding the licensees PMF calculation, the NRC staff noted that this calculation used for the current licensing basis may not be conservative.
Seismic and Civil/Structural Analyses for the Jocassee Dam The licensee presented information on the construction and seismic design of the Jocassee Dam. The details are contained on the licensees slides.
OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION
OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION During the meeting, the NRC staff raised questions associated with the seismic and structural capabilities of the Jocassee Dam and as a result, requested additional information from the licensee as documented later in this meeting summary. The areas of concern include: (1) dam foundation and construction, (2) seismic hazards curves used by the licensee, (3) potential for liquefaction under the Jocassee Dam, and (4) seepage and settlement of the Jocassee Dam.
Status and Content of Procedures in Response to External Flooding at the Oconee Site During the meeting, the licensee discussed creating interim guidance to address mitigation of postulated flood events that could render the standby shutdown facility (SSF) inoperable.
Status of Engineered Solution Analyses for the Resolution of the Flooding Issues at the Oconee Nuclear Station Site During the meeting, the licensee provided a proposed schedule for the completion of regulatory commitments associated with the protection of the Oconee Nuclear Station site from external flooding events.
NRC Staffs Requests for Additional Information Based on the discussion with the licensee during the meeting, the NRC staff made the following requests for additional information from the licensee:
(1) What is the actual height of the Jocassee Dam from the foundation, given that approximately a 100-foot depth of saprolite was excavated from the foundation?
(2) What percentage of the length of the Jocassee Dam is not located on sound rock, and where is this area located?
(3) What is the basis for the PMF inflow hydrograph? Does the selection of the hydrograph consider antecedent rainfall and the soil saturation that could occur during that rainfall?
The infiltration rate assumed appears to be high (i.e., the runoff rate is too low).
(4) The licensee should reconsider the assumption that Keowee Dam fails due to overtopping following the failure of Jocassee Dam. Provide the results of the new inundation study for the worst case flooding of the Oconee, yard, considering the Keowee Dam fails and does not fail following failure of the Jocassee Dam.
(5) The licensee should consider Jocassee Dam failure breach sizes up to an average breach width of 1100 feet, if seismic failures are not discounted. The breach sizes considered in the 1983 and 1992 inundation studies, respectively, appear to be not conservative.
Provide a sensitivity study on breach sizes and resulting inundation levels.
OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION
OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION (6) The seismic hazard curve assumed in the Applied Research and Engineering Sciences (ARES) Corporation fragility report appears not to be conservative and not current with recent United States Geological Survey curves. Provide a justification for the use of the curve.
(7) What is the composition of the random rock fill that comprises a large portion of the shell?
What is the density of this fill? How was this fill compacted? Are there records on the density tests that were completed? Provide the results of the seismically-induced liquefaction potential evaluation of the materials constituting the Jocassee Dam.
(8) Describe in more detail the construction and preparation of the foundation of the main Jocassee Dam.
(9) What are the thresholds values governing the monitoring of seepage and observation wells at the Jocassee Dam that would cause additional review and analysis and/or action?
(10) What were the magnitudes of the settlement prior to the 1992 baseline at the Jocassee Dam? What is the threshold value related to the monitoring of settlement of the Jocassee Dam that would cause additional review and analysis and/or action?
(11) Why is the horizontal displacement greater for the monuments located on the crest, than at the monument located at lower elevations of the Jocassee Dam?
(12) Describe why a failure of the saddle dikes would not cause flooding in the Oconee Nuclear Station yard.
(13) Describe the degree of saturation of the core and its potential affect on liquefaction, in light of the un-conservative seismic hazard curve, noted in item 6 (above).
(14) Provide, if available, an inflow flood frequency analysis for the Jocassee Reservoir.
(15) Provide storage curves for the Jocassee Reservoir.
(16) Determine the amount of sediment accumulated in the Keowee Reservoir and its potential to affect HEC-RAS calculated inundation levels.
(17) The outflow volume provided in the 1992 inundation study appears to be too low. Provide a justification for this magnitude of outflow.
(18) Provide a copy of a cross section of the Bad Creek Dam.
The licensee requested the NRC provide a listing of the 34 dam failures used in the NRC staffs probabilistic risk assessment analysis.
OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION
OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION At the conclusion of the meeting, the NRC staff and the licensee agreed to hold biweekly phone conversations on the status of the completion of the requested above information.
Sincerely,
/RA/
John Stang, Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-269, 50-270, and 50-287
Enclosure:
Meeting Attendees OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION
OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION MEETING ATTENDEES AT THE CLOSED DECEMBER 4, 2008, MEETING WITH DUKE ENERGY CAROLINAS, LLC (DUKE) TO DISCUSS THE LICENSEES SEPTEMBER 26, 2008, RESPONSE TO THE NUCLEAR REGULATORY COMMISSIONS, AUGUST 15, 2008, 50.54(f)
LETTER ON EXTERNAL FLOODING AT THE OCONEE NUCLEAR STATION, UNITS 1, 2, AND 3 NRC DUKE K. See L. Kanipe J. Stang R. Freudenberger D. Skeen T. Brown M. Galloway E. Luttrell R. Schaaf R. McCoy M. Franovich S. Nader G. Bagchi G. Davenport L. Olshan K. Manoly R. Pichumani J. Vail R. Carroll*
B. Davis*
E. Riggs*
- Participated by phone Enclosure OFFICIAL USE ONLY - SECURITY-RELATED INFORMATION