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| | number = ML12166A203 | | | number = ML12166A203 |
| | issue date = 05/24/2012 | | | issue date = 05/24/2012 |
| | title = 05/24/2012 Meeting Slides - Summary of Meeting with Duke Energy Carolinas, LLC, to Discuss the Installation of Main Steam Isolation Valves at Oconee Nuclear Station, Units 1, 2, and 3 | | | title = Meeting Slides - Summary of Meeting with Duke Energy Carolinas, LLC, to Discuss the Installation of Main Steam Isolation Valves at Oconee Nuclear Station, Units 1, 2, and 3 |
| | author name = | | | author name = |
| | author affiliation = Duke Energy Carolinas, LLC | | | author affiliation = Duke Energy Carolinas, LLC |
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| | document type = Slides and Viewgraphs, Meeting Briefing Package/Handouts | | | document type = Slides and Viewgraphs, Meeting Briefing Package/Handouts |
| | page count = 19 | | | page count = 19 |
| | project = TAC:ME8505, TAC:ME8504, TAC:ME8506 | | | project = TAC:ME8504, TAC:ME8505, TAC:ME8506 |
| | stage = Other | | | stage = Meeting |
| }} | | }} |
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| =Text= | | =Text= |
| {{#Wiki_filter:Oconee Nuclear Station May 24, 2012 Main Steam Isolation Valve License Amendment Request 2 Agenda Purpose of the Meeting Basis for MSIV Modification Description of MSIV Modification Regulatory Approach Schedule Closing Remarks 3 Purpose of the Meeting First Pre-submittal discussion regarding License Amendment Request (LAR) in support of installation of Main Steam Isolation Valves Initiate discussions between Duke Energy and the NRC so that there is a common understanding of the scope and content of the planned LAR, prior to submittal Scoping 10 CFR 50.59 drafted to identify the scope of the LAR Most efficient use of NRC and Duke Energy resources Will not request NRC review of modification Facilitate timely approval of materials needed to support the modification 4 Basis for MSIV Modification Part of major upgrades to Oconee Nuclear Station to improve plant safety and address longstanding licensing basis issues Safety Benefit Enhance Main Steam System integrity to support the Secondary Side Decay Heat Removal function of the Standby Shutdown Facility (SSF) Tornado missile analysis (TORMIS) relies on 'target' reduction achieved by isolation of the Main Steam piping in the Turbine Building Facilitates repair of plant equipment following damage to main steam piping in the Turbine Building Meets commitments associated with proposed updates to High Energy Line Break (HELB) and Tornado licensing bases Proposed update to HELB (outside containment) licensing basis credits MSIVs (LAR re-submitted 12/16/2011 ML12003A070) Proposed update to tornado licensing basis credits MSIVs (LAR dated 6/26/2008 ML081840371) 5 Description of MSIV Modification A single seismic, tornado protected enclosure (MSIV Enclosure) per unit will be constructed New piping and valves will be installed in the MSIV Enclosure Main Steam Isolation Valves (MSIVs) Main Steam Relief Valves (MSRVs) Atmospheric Dump Valves (ADVs) Power Operated Atmospheric Dump Valves (POADVs) Majority of construction will occur online with tie-in to existing Main Steam (MS) piping occurring during outage 6 Modification Description 7 MSIV Enclosure Top View 8 MSIV Enclosure Pre-Outage 9 MSIV Enclosure Outage 10 Main Steam Isolation Valves Designed to close against HELB conditions in less than 5 seconds after receiving a close signal Passive features of valve increase reliability Automatic closure on Low MS Header Pressure provides MS system integrity to support SSF function Design reduces likelihood of inadvertent actuation (preliminary analysis of event - results comparable to turbine trip) Remotely operated from the Control Rooms Main Steam Isolation Valves 11 12 Additional Modification Scope Current MSRVs will be replaced with new valves Addresses obsolescence Flanged installation will facilitate maintenance and testing New POADV in MSIV Enclosure Allows operation from the Control Room Reduces Operator burden for mitigation of SBLOCA Turbine Building manual ADV design duplicated and protected in MSIV Enclosure 13 Main Steam Flow Diagram Turbine Driven EFW Pump Steam Supply The Turbine Driven Emergency Feedwater (EFW) Pump licensing basis is maintained A station blackout (SBO) will not cause the MSIVs to close nor will it prevent the MSIVs from closing on a valid low MS pressure signal If an Main Steam Line Break occurs, the Turbine Driven EFW Pump is automatically stopped on low MS pressure in either MS header The Motor Driven EFW Pump aligned to the intact steam generator (SG) provides secondary side decay heat removal after the overcooling has been terminated If the Turbine Driven EFW Pump is desired with both MSIVs closed, steam could be supplied from another unit via the auxiliary steam system 14 15 Regulatory Approach Scoping 10 CFR 50.59 drafted to identify the scope of the License Amendment Request Duke Energy needs NRC approval of the Chapter 15 analysis methodology changes associated with the MSIV installation DPC-NE-3000-PA, Rev. 4a, "Thermal Hydraulic Transient Analysis Methodology" DPC-NE-3005-PA, Rev. 3b, "Oconee UFSAR Chapter 15 Transient Analysis Methodology" License Amendment Request will provide Technical Specification (TS) Bases changes and a new Selected Licensee Commitment for information UFSAR changes will be made under 10 CFR 50.71(e) following modification implementation 16 Methodology Changes DPC-NE-3000 changes: Changes to describe actual plant configuration with MSIVs and how the RETRAN model of the MS line would be modified Realistic modeling of the MSIVs, their closing characteristics, and where they are located More accurate modeling of new piping layout, to better predict MS pressure distribution DPC-NE-3005 changes: Explicit statement within Section 15 for Single MSLB, to clarify that the MSIVs are not credited for isolating the unaffected SG from the faulted SG 17 Regulatory Approach Continue to rely on the Turbine Stop Valves, required by TS 3.7.2, for design basis accident mitigation TS not required for MSIVs Add New Selected Licensee Commitment (SLC) to impose functionality requirements for MSIVs consistent with the other equipment that is controlled by SLC No changes required to TS 3.7.4 for ADV flow path Revise TS 3.7.4 Bases to define the required ADV flow path Revise TS 3.3.11 &13 Bases to indicate that Automatic Feedwater Isolation System will automatically close the MSIVs on low MS header pressure 18 Schedule MSIV Methodology LAR Schedule 1/31/2013 target date for submittal Request NRC approval by 1/31/2014 Planned MSIV Modification Schedule Unit 1 Fall 2014 Outage Committed Date -12/2014 Unit 2 Fall 2015 Outage Committed Date - 12/2015 Unit 3 Spring 2016 Outage Committed Date - 07/2016 19 Closing Remarks Initiate discussions to develop common understanding of the scope and content of the planned LAR, prior to submittal Scoping 10 CFR 50.59 drafted to identify the scope of the LAR Most efficient use of NRC and Duke Energy resources Will not request NRC review of modification Facilitate timely approval of materials needed to support the modification NRC approval of LAR requested by 1/31/2014 Supports first MSIV installation on Unit 1 in Fall 2014 outage | | {{#Wiki_filter:Main Steam Isolation Valve License Amendment Request Oconee Nuclear Station May 24, 2012 FOR INFORMATION ONLY |
| }} | | |
| | Agenda Purpose of the Meeting Basis for MSIV Modification Description of MSIV Modification Regulatory Approach Schedule Closing Remarks 2 |
| | FOR INFORMATION ONLY |
| | |
| | Purpose of the Meeting First Pre-submittal discussion regarding License Amendment Request (LAR) in support of installation of Main Steam Isolation Valves Initiate discussions between Duke Energy and the NRC so that there is a common understanding of the scope and content of the planned LAR, prior to submittal Scoping 10 CFR 50.59 drafted to identify the scope of the LAR Most efficient use of NRC and Duke Energy resources Will not request NRC review of modification Facilitate timely approval of materials needed to support the modification 3 |
| | FOR INFORMATION ONLY |
| | |
| | Basis for MSIV Modification Part of major upgrades to Oconee Nuclear Station to improve plant safety and address longstanding licensing basis issues Safety Benefit Enhance Main Steam System integrity to support the Secondary Side Decay Heat Removal function of the Standby Shutdown Facility (SSF) |
| | Tornado missile analysis (TORMIS) relies on target reduction achieved by isolation of the Main Steam piping in the Turbine Building Facilitates repair of plant equipment following damage to main steam piping in the Turbine Building Meets commitments associated with proposed updates to High Energy Line Break (HELB) and Tornado licensing bases Proposed update to HELB (outside containment) licensing basis credits MSIVs (LAR re-submitted 12/16/2011 ML12003A070) |
| | Proposed update to tornado licensing basis credits MSIVs (LAR dated 6/26/2008 ML081840371) 4 FOR INFORMATION ONLY |
| | |
| | Description of MSIV Modification A single seismic, tornado protected enclosure (MSIV Enclosure) per unit will be constructed New piping and valves will be installed in the MSIV Enclosure Main Steam Isolation Valves (MSIVs) |
| | Main Steam Relief Valves (MSRVs) |
| | Atmospheric Dump Valves (ADVs) |
| | Power Operated Atmospheric Dump Valves (POADVs) |
| | Majority of construction will occur online with tie-in to existing Main Steam (MS) piping occurring during outage 5 |
| | FOR INFORMATION ONLY |
| | |
| | Modification Description 6 |
| | FOR INFORMATION ONLY |
| | |
| | MSIV Enclosure Top View 7 |
| | FOR INFORMATION ONLY |
| | |
| | MSIV Enclosure Pre-Outage 8 |
| | FOR INFORMATION ONLY |
| | |
| | MSIV Enclosure Outage 9 |
| | FOR INFORMATION ONLY |
| | |
| | Main Steam Isolation Valves Designed to close against HELB conditions in less than 5 seconds after receiving a close signal Passive features of valve increase reliability Automatic closure on Low MS Header Pressure provides MS system integrity to support SSF function Design reduces likelihood of inadvertent actuation (preliminary analysis of event - results comparable to turbine trip) |
| | Remotely operated from the Control Rooms 10 FOR INFORMATION ONLY |
| | |
| | Main Steam Isolation Valves 11 FOR INFORMATION ONLY |
| | |
| | Additional Modification Scope Current MSRVs will be replaced with new valves Addresses obsolescence Flanged installation will facilitate maintenance and testing New POADV in MSIV Enclosure Allows operation from the Control Room Reduces Operator burden for mitigation of SBLOCA Turbine Building manual ADV design duplicated and protected in MSIV Enclosure 12 FOR INFORMATION ONLY |
| | |
| | Main Steam Flow Diagram 13 FOR INFORMATION ONLY |
| | |
| | Turbine Driven EFW Pump Steam Supply The Turbine Driven Emergency Feedwater (EFW) Pump licensing basis is maintained A station blackout (SBO) will not cause the MSIVs to close nor will it prevent the MSIVs from closing on a valid low MS pressure signal If an Main Steam Line Break occurs, the Turbine Driven EFW Pump is automatically stopped on low MS pressure in either MS header The Motor Driven EFW Pump aligned to the intact steam generator (SG) provides secondary side decay heat removal after the overcooling has been terminated If the Turbine Driven EFW Pump is desired with both MSIVs closed, steam could be supplied from another unit via the auxiliary steam system 14 FOR INFORMATION ONLY |
| | |
| | Regulatory Approach Scoping 10 CFR 50.59 drafted to identify the scope of the License Amendment Request Duke Energy needs NRC approval of the Chapter 15 analysis methodology changes associated with the MSIV installation DPC-NE-3000-PA, Rev. 4a, Thermal Hydraulic Transient Analysis Methodology DPC-NE-3005-PA, Rev. 3b, Oconee UFSAR Chapter 15 Transient Analysis Methodology License Amendment Request will provide Technical Specification (TS) Bases changes and a new Selected Licensee Commitment for information UFSAR changes will be made under 10 CFR 50.71(e) following modification implementation 15 FOR INFORMATION ONLY |
| | |
| | Methodology Changes DPC-NE-3000 changes: |
| | Changes to describe actual plant configuration with MSIVs and how the RETRAN model of the MS line would be modified Realistic modeling of the MSIVs, their closing characteristics, and where they are located More accurate modeling of new piping layout, to better predict MS pressure distribution DPC-NE-3005 changes: |
| | Explicit statement within Section 15 for Single MSLB, to clarify that the MSIVs are not credited for isolating the unaffected SG from the faulted SG 16 FOR INFORMATION ONLY |
| | |
| | Regulatory Approach Continue to rely on the Turbine Stop Valves, required by TS 3.7.2, for design basis accident mitigation TS not required for MSIVs Add New Selected Licensee Commitment (SLC) to impose functionality requirements for MSIVs consistent with the other equipment that is controlled by SLC No changes required to TS 3.7.4 for ADV flow path Revise TS 3.7.4 Bases to define the required ADV flow path Revise TS 3.3.11 &13 Bases to indicate that Automatic Feedwater Isolation System will automatically close the MSIVs on low MS header pressure 17 FOR INFORMATION ONLY |
| | |
| | Schedule MSIV Methodology LAR Schedule 1/31/2013 target date for submittal Request NRC approval by 1/31/2014 Planned MSIV Modification Schedule Unit 1 Fall 2014 Outage Committed Date -12/2014 Unit 2 Fall 2015 Outage Committed Date - 12/2015 Unit 3 Spring 2016 Outage Committed Date - 07/2016 18 FOR INFORMATION ONLY |
| | |
| | Closing Remarks Initiate discussions to develop common understanding of the scope and content of the planned LAR, prior to submittal Scoping 10 CFR 50.59 drafted to identify the scope of the LAR Most efficient use of NRC and Duke Energy resources Will not request NRC review of modification Facilitate timely approval of materials needed to support the modification NRC approval of LAR requested by 1/31/2014 Supports first MSIV installation on Unit 1 in Fall 2014 outage 19 FOR INFORMATION ONLY}} |
Letter Sequence Meeting |
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MONTHYEARML12003A0702011-12-16016 December 2011 Tornado and High Energy Line Break (HELB) Mitigation License Amendment Requests (Lars) - Responses to Request for Additional Information, Part 1 of 6 Project stage: Response to RAI ML12122A1392012-05-0404 May 2012 Forthcoming Meeting with Duke Energy Carolinas, LLC to Discuss Consideration of Adding Main Steam Isolation Valves to Oconee Nuclear Station, Units 1, 2, and 3 Project stage: Meeting ML12166A2032012-05-24024 May 2012 Meeting Slides - Summary of Meeting with Duke Energy Carolinas, LLC, to Discuss the Installation of Main Steam Isolation Valves at Oconee Nuclear Station, Units 1, 2, and 3 Project stage: Meeting ML12145A7052012-06-14014 June 2012 Summary of Meeting with Duke Energy Carolinas, LLC, to Discuss the Installation of Main Steam Isolation Valves at Oconee Nuclear Station, Units 1, 2, and 3 Project stage: Meeting ML12213A5122012-08-0101 August 2012 Notice of Forthcoming Meeting with Duke Energy Carolinas, LLC to Discuss Consideration of Adding Main Steam Isolation Valves to the Oconee Nuclear Station, Units 1, 2, and 3 Project stage: Meeting ML12248A2322012-09-0606 September 2012 Summary of Meeting with Duke Energy Carolinas, LLC, to Discuss the Installation of Main Steam Isolation Valves at Oconee Nuclear Station, Units 1, 2 and 3 (ONS 1/2/3) Project stage: Meeting 2012-05-04
[Table View] |
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Category:Slides and Viewgraphs
MONTHYEARML24100A8062024-04-0909 April 2024 Duke Energy Sites Annual Assessment Meeting Presentation Slides April 23, 2024 ML24046A1612024-02-16016 February 2024 February 2024 Dseis Public Meeting - Virtual Meeting Slides ML24046A1602024-02-16016 February 2024 February 2024 Dseis Public Meeting - In-person Meeting Slides ML23087A2972023-04-17017 April 2023 Annual Assessment Meeting Presentation ML22251A2352022-09-14014 September 2022 Presentation Slides for September 14, 2022, Observation Public Meeting ML22130A0102022-04-28028 April 2022 Duke Presentation for April 28, 2022 Public Meeting - Containment Liner ML22130A0092022-04-28028 April 2022 Duke Presentation for April 28, 2022 Public Meeting - Bolting Integrity ML22109A2122022-04-20020 April 2022 Duke Energy Pre-Submittal Public April 20, 2022, Meeting Presentation ML22075A2012022-03-0707 March 2022 Duke 03/07/2022 Presentation - Bolting Integrity ML22067A1992022-03-0303 March 2022 Annual Assessment Meeting Presentation ML22301A1672022-02-0505 February 2022 Presentation 5 - Oconee Trip and Notification of Unusual Event on February 5, 2022 ML22063A1142022-01-17017 January 2022 Duke Presentation for Public Meeting on February 17, 2022 ML21322A3262021-11-29029 November 2021 Duke Energy November 29, 2021 Pre-Submittal Public Meeting Slides for EOF Relocation Licensing Amendment Request 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 ML21034A5552021-01-26026 January 2021 SLRA - NRC Presubmittal Meeting Slides ML21034A5562021-01-26026 January 2021 SLRA - Duke Presubmittal Meeting Slides ML20300A0872020-10-27027 October 2020 Subsequent License Renewal Application NRC Environmental Pre-Application Meeting - Duke Energy Presentation ML20300A0902020-10-27027 October 2020 Subsequent License Renewal Environmental Pre-Application Meeting - NRC Presentation ML20134J0052020-05-13013 May 2020 EOC Slides (2) ML20125A2312020-05-0404 May 2020 EOC Slides 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 ML18086A7742018-02-21021 February 2018 LOR Program Biennial Inspection 71111.11B Exam Overlap Issues ML17296A1462017-10-24024 October 2017 Duke Energy Presentation to CRGR - Oconee Nuclear Station 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 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 ML14211A2162014-07-31031 July 2014 NRC Meeting Slides 7-31-14 Reg Conference ML14211A2132014-07-31031 July 2014 Duke Energy Presentation for 2014-07-31 Meeting ML14147A3652014-05-27027 May 2014 Annual Assessment Public Meeting Summary Memo ML14055A4102014-02-0404 February 2014 Meeting Slides on Standby Shutdown Facility Flood Barrier Breach Violation Informal Reassessment ML14058A0352014-02-0404 February 2014 Meeting Slides on Oconee Flood Protection and the 10 CFR 50.54(f) Response ML14058A0512014-02-0404 February 2014 Slides on Oconee Nuclear Station - Standby Shutdown Facility (Ssf) Flood Barrier Breach Violation SDP Assessment ML14058A0742014-02-0404 February 2014 Slides on Oconee Ssf Flood Barrier Breach SDP - Lessons Learned ML14058A0772014-02-0404 February 2014 Slides on Oconee Ssf Flood Barrier Breach SDP Lessons Learned 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 ML13239A3402013-08-27027 August 2013 Presentation for NRC Projects ML13239A3372013-08-27027 August 2013 NRC Meeting Slides, Oconee Major Project Meeting - August 28, 2013 ML13226A2662013-05-0303 May 2013 E-mail from J. Boska, NRR to S. Hicks, Ois FW: Change in Public Availability of Slide Package 2024-04-09
[Table view] Category:Meeting Briefing Package/Handouts
MONTHYEARML24100A8062024-04-0909 April 2024 Duke Energy Sites Annual Assessment Meeting Presentation Slides April 23, 2024 ML22251A2352022-09-14014 September 2022 Presentation Slides for September 14, 2022, Observation Public Meeting ML22130A0102022-04-28028 April 2022 Duke Presentation for April 28, 2022 Public Meeting - Containment Liner ML22130A0092022-04-28028 April 2022 Duke Presentation for April 28, 2022 Public Meeting - Bolting Integrity 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 ML14211A2162014-07-31031 July 2014 NRC Meeting Slides 7-31-14 Reg Conference ML14211A2132014-07-31031 July 2014 Duke Energy Presentation for 2014-07-31 Meeting 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. ML13052A7822013-02-0606 February 2013 Slides on Oconee Ssf Flood Barrier Breach SDP - Lessons Learned ML13056A0992013-02-0606 February 2013 Meeting Slides on Oconee Ssf Flood Barrier Breach Sdsp - Lessons Learned ML13056A1022013-02-0606 February 2013 Meeting Slides on Oconee Flood Issue Jocassee Dam Failure Frequency ML13035A2332013-01-30030 January 2013 Projects Meeting - Licensee'S Public Meeting Slides 2024-04-09
[Table view] |
Text
Main Steam Isolation Valve License Amendment Request Oconee Nuclear Station May 24, 2012 FOR INFORMATION ONLY
Agenda Purpose of the Meeting Basis for MSIV Modification Description of MSIV Modification Regulatory Approach Schedule Closing Remarks 2
FOR INFORMATION ONLY
Purpose of the Meeting First Pre-submittal discussion regarding License Amendment Request (LAR) in support of installation of Main Steam Isolation Valves Initiate discussions between Duke Energy and the NRC so that there is a common understanding of the scope and content of the planned LAR, prior to submittal Scoping 10 CFR 50.59 drafted to identify the scope of the LAR Most efficient use of NRC and Duke Energy resources Will not request NRC review of modification Facilitate timely approval of materials needed to support the modification 3
FOR INFORMATION ONLY
Basis for MSIV Modification Part of major upgrades to Oconee Nuclear Station to improve plant safety and address longstanding licensing basis issues Safety Benefit Enhance Main Steam System integrity to support the Secondary Side Decay Heat Removal function of the Standby Shutdown Facility (SSF)
Tornado missile analysis (TORMIS) relies on target reduction achieved by isolation of the Main Steam piping in the Turbine Building Facilitates repair of plant equipment following damage to main steam piping in the Turbine Building Meets commitments associated with proposed updates to High Energy Line Break (HELB) and Tornado licensing bases Proposed update to HELB (outside containment) licensing basis credits MSIVs (LAR re-submitted 12/16/2011 ML12003A070)
Proposed update to tornado licensing basis credits MSIVs (LAR dated 6/26/2008 ML081840371) 4 FOR INFORMATION ONLY
Description of MSIV Modification A single seismic, tornado protected enclosure (MSIV Enclosure) per unit will be constructed New piping and valves will be installed in the MSIV Enclosure Main Steam Isolation Valves (MSIVs)
Main Steam Relief Valves (MSRVs)
Atmospheric Dump Valves (ADVs)
Power Operated Atmospheric Dump Valves (POADVs)
Majority of construction will occur online with tie-in to existing Main Steam (MS) piping occurring during outage 5
FOR INFORMATION ONLY
Modification Description 6
FOR INFORMATION ONLY
MSIV Enclosure Top View 7
FOR INFORMATION ONLY
MSIV Enclosure Pre-Outage 8
FOR INFORMATION ONLY
MSIV Enclosure Outage 9
FOR INFORMATION ONLY
Main Steam Isolation Valves Designed to close against HELB conditions in less than 5 seconds after receiving a close signal Passive features of valve increase reliability Automatic closure on Low MS Header Pressure provides MS system integrity to support SSF function Design reduces likelihood of inadvertent actuation (preliminary analysis of event - results comparable to turbine trip)
Remotely operated from the Control Rooms 10 FOR INFORMATION ONLY
Main Steam Isolation Valves 11 FOR INFORMATION ONLY
Additional Modification Scope Current MSRVs will be replaced with new valves Addresses obsolescence Flanged installation will facilitate maintenance and testing New POADV in MSIV Enclosure Allows operation from the Control Room Reduces Operator burden for mitigation of SBLOCA Turbine Building manual ADV design duplicated and protected in MSIV Enclosure 12 FOR INFORMATION ONLY
Main Steam Flow Diagram 13 FOR INFORMATION ONLY
Turbine Driven EFW Pump Steam Supply The Turbine Driven Emergency Feedwater (EFW) Pump licensing basis is maintained A station blackout (SBO) will not cause the MSIVs to close nor will it prevent the MSIVs from closing on a valid low MS pressure signal If an Main Steam Line Break occurs, the Turbine Driven EFW Pump is automatically stopped on low MS pressure in either MS header The Motor Driven EFW Pump aligned to the intact steam generator (SG) provides secondary side decay heat removal after the overcooling has been terminated If the Turbine Driven EFW Pump is desired with both MSIVs closed, steam could be supplied from another unit via the auxiliary steam system 14 FOR INFORMATION ONLY
Regulatory Approach Scoping 10 CFR 50.59 drafted to identify the scope of the License Amendment Request Duke Energy needs NRC approval of the Chapter 15 analysis methodology changes associated with the MSIV installation DPC-NE-3000-PA, Rev. 4a, Thermal Hydraulic Transient Analysis Methodology DPC-NE-3005-PA, Rev. 3b, Oconee UFSAR Chapter 15 Transient Analysis Methodology License Amendment Request will provide Technical Specification (TS) Bases changes and a new Selected Licensee Commitment for information UFSAR changes will be made under 10 CFR 50.71(e) following modification implementation 15 FOR INFORMATION ONLY
Methodology Changes DPC-NE-3000 changes:
Changes to describe actual plant configuration with MSIVs and how the RETRAN model of the MS line would be modified Realistic modeling of the MSIVs, their closing characteristics, and where they are located More accurate modeling of new piping layout, to better predict MS pressure distribution DPC-NE-3005 changes:
Explicit statement within Section 15 for Single MSLB, to clarify that the MSIVs are not credited for isolating the unaffected SG from the faulted SG 16 FOR INFORMATION ONLY
Regulatory Approach Continue to rely on the Turbine Stop Valves, required by TS 3.7.2, for design basis accident mitigation TS not required for MSIVs Add New Selected Licensee Commitment (SLC) to impose functionality requirements for MSIVs consistent with the other equipment that is controlled by SLC No changes required to TS 3.7.4 for ADV flow path Revise TS 3.7.4 Bases to define the required ADV flow path Revise TS 3.3.11 &13 Bases to indicate that Automatic Feedwater Isolation System will automatically close the MSIVs on low MS header pressure 17 FOR INFORMATION ONLY
Schedule MSIV Methodology LAR Schedule 1/31/2013 target date for submittal Request NRC approval by 1/31/2014 Planned MSIV Modification Schedule Unit 1 Fall 2014 Outage Committed Date -12/2014 Unit 2 Fall 2015 Outage Committed Date - 12/2015 Unit 3 Spring 2016 Outage Committed Date - 07/2016 18 FOR INFORMATION ONLY
Closing Remarks Initiate discussions to develop common understanding of the scope and content of the planned LAR, prior to submittal Scoping 10 CFR 50.59 drafted to identify the scope of the LAR Most efficient use of NRC and Duke Energy resources Will not request NRC review of modification Facilitate timely approval of materials needed to support the modification NRC approval of LAR requested by 1/31/2014 Supports first MSIV installation on Unit 1 in Fall 2014 outage 19 FOR INFORMATION ONLY