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Category:Meeting Briefing Package/Handouts
MONTHYEARML24164A2942024-06-17017 June 2024 Licensee Slides for Pre-submittal Meeting for VEGP Units 3 and 4 for a Proposed License Amendment Request Regarding TS 3.3.8 ML24158A3832024-06-0606 June 2024 SNC Slides - Vogtle 3 and 4 - TS 3-8-2 - Pre-Submittal Meeting - 06-27-2024 ML24120A2202024-04-30030 April 2024 Annual Assessment Meeting Presentation Slides - April 30, 2024 ML24089A1492024-04-0404 April 2024 Slides - SNC Presentation - Pre-Submittal Meeting on April 4, 2024 - Proposed Vogtle 3 and 4 TS 3.7.6 LAR ML24060A2732024-03-0707 March 2024 SNC Slides - Pre-Submittal Meeting on March 7, 2024 - Vogtle 3 & 4 TSTF-577 LAR ML24022A1192024-01-24024 January 2024 Slides - SNC Slides - Pre-Submittal Meeting on January 24, 2024 - Vogtle 3 & 4 Explosively Actuated Valves Relief Request ML23361A0812024-01-0808 January 2024 SNC Slides - Pre-Submittal Public Meeting on January 8, 2024 Related to Fleet QATR ML24004A1852024-01-0404 January 2024 SNC Slides - Pre-Submittal Public Meeting on January 8, 2024 Related to Fleet QATR Revised ML23257A2322023-09-28028 September 2023 SNC Presentation - Pre-Submittal Meeting on September 28, 2023 - Proposed Vogtle 3 and 4 TS 3.7.6 LAR ML23137A1162023-06-0202 June 2023 Draft Slides for Advisory Committee on Reactor Safeguards Subcommittee Meeting Regarding Use of Accident Tolerant Fuel Lead Test Assemblies ML23094A1402023-04-0404 April 2023 4 -- 2022 Aam Slides ML23055A0402023-02-24024 February 2023 VEGP, Unit 4, Potential License Amendment Request for Prior to Initial Criticality Overview Presentation ML23033A0232023-02-0202 February 2023 Dashboard Report 2-2-2023 ML22329A0192022-12-0101 December 2022 Southern Nuclear Company Slides - Pre-Submittal Meeting on December 1, 2022 - Vogtle SR 3.4.14.1 LAR and Alternative Relief Request 1 ML22335A0372022-12-0101 December 2022 Dashboard Report 12-1-2022 ML22332A5372022-11-28028 November 2022 Draft LAR 23-001 for 12-8-22 Public Meeting ML22332A0012022-11-28028 November 2022 SNC Slides - Pre-Submittal Meeting on November 30, 2022 - Vogtle TS 5.5.11 License Amendment Request ML22319A1232022-11-15015 November 2022 Kozak Slides for November 15, 2022 Public Meeting on Part 52 Lessons Learned ML22319A0052022-11-15015 November 2022 NEI Slides for November 15 2022 Public Meeting on Part 52 Lessons Learned ML22319A1242022-11-15015 November 2022 NRC Slides for November 15, 2022 Public Meeting on Part 52 Lessons Learned ML22251A0002022-09-30030 September 2022 Pre-Submittal Meeting on September 13, 2022 - Vogtle Online Monitoring LAR ML22265A0972022-09-22022 September 2022 Southern Nuclear Company Slides on Lessons Learned from Part 52 Implementation for Public Meeting on 9/27/2022 ML22265A0982022-09-22022 September 2022 NRC Slides on Part 52 Lessons Learned Construction Initiative for Public Meeting on 9/27/2022 ML22138A3952022-05-24024 May 2022 Slides - SNC Slides - Pre-Submittal Meeting on May 24, 2022 - Vogtle RR RWST Suction Check Valves ML22137A2812022-05-23023 May 2022 Slides - SNC Slides - Pre-Submittal Meeting on May 23, 2022 - Vogtle TS 3.8.1 and TSTF-163 LAR ML22126A0102022-05-11011 May 2022 Pre-Submittal Meeting on May 11, 2022 - Vogtle ATF LTAs LAR and Exemption Requests - Licensing Questions ML22123A3332022-05-10010 May 2022 Pre-Submittal Meeting 2: TSTF-51, TSTF-471, TSTF-490, and Alternative Source Term License Amendment Request - May 10, 2022 (EPID L-2022-LRM-0033)(slides) ML22110A1702022-04-20020 April 2022 4 2022 Annual Assessment Meeting.Final ML22021B6472022-01-27027 January 2022 Pre-Submittal for Westinghouse Increased Enrichment Accident Tolerant Fuel Lead Test Assemblies (EPID L-2022-LRM-0003) (Slides) ML21306A0242021-11-30030 November 2021 SNC Pre-Submittal Meeting for LAR to Relocate Augmented Piping Inspection Program Details from TSs to a Licensee Controlled Document for Farley Nuclear Plant, Units 1 & 2; and Vogtle Electric Generating Plant, Units 1 & 2 (EPID L-2021-LRM-0 ML21333A2172021-11-29029 November 2021 Readiness Group Presentation During 12-2-21 Public Meeting ML21230A2842021-08-18018 August 2021 SNC Slides - Vogtle MSIV Elimination LAR - Pre-submittal Meeting Part 2 - 08-25-2021 ML21193A0762021-07-0808 July 2021 ITAAC Related to Incore Instrument Thimble Assembly (Iita) ML21187A0972021-07-0808 July 2021 Late Filed Allegations (Lfa) Process ML21172A1312021-07-0101 July 2021 Pre-Submittal Meeting Alternate Source Term and TSTF-490 ML21193A0772021-06-24024 June 2021 Exemption from Operator Written Examination and Operating Test for Unit 4 Licenses, 6-24-21 Pre-submittal Meeting ML21085A4902021-05-19019 May 2021 Risk-informed Resolution of Generic Letter 2004-02 ML21064A3652021-03-0101 March 2021 Dashboard Report 3-1-2021 ML21027A2062021-02-28028 February 2021 Fixed 8-Hour Emergency Light Deviation Pre-Submittal Meeting, February 2021 (Slides) ML21057A0182021-02-26026 February 2021 Pre-Submittal Meeting Revise Technical Specification 3.2.1 Heat Flux Hot Channel Factor (Fq(Z)) (EPID L-2021-LRM-0023) (Slides) ML21036A1172021-02-0505 February 2021 SNC Slides - Pre-Submittal Meeting on February 16, 2021 - Beacon LAR ML20343A0742020-12-0202 December 2020 Dashboard Report 12-2-2020 ML20318A1032020-11-12012 November 2020 SNC ERO Staffing LAR RAI Responses ML20314A0962020-11-0202 November 2020 Dashboard Report 11/02/2020 ML20217L4312020-08-13013 August 2020 Edwin I Hatch, Units 1 and 2; and Vogtle Electric Plant, Units 1, 2, 3, and 4 - Meeting Slides a License Amendment Request for the Emergency Plan (EPID Nos L-2020-LLA-0150 and L-2020-LLA-051 ML20136A2832020-05-15015 May 2020 4 EOC Slides ML20114E3032020-04-23023 April 2020 Risk-Informed GL 2004--02 Pre-Submittal NRC Meeting - May 2020 ML20007D6772020-01-0808 January 2020 AP1000 Public Presentation Entitled Reactor Oversight Process (ROP) for Inspecting Vogtle Site with AP1000 Design ML19303A0252019-11-0404 November 2019 Risk-Informed GSI-191 NRC Public Meeting ML19295D4672019-10-30030 October 2019 Public Meeting for ITAAC Hearing Process, October 30, 2019 2024-06-06
[Table view] Category:Slides and Viewgraphs
MONTHYEARML24164A2942024-06-17017 June 2024 Licensee Slides for Pre-submittal Meeting for VEGP Units 3 and 4 for a Proposed License Amendment Request Regarding TS 3.3.8 ML24158A3832024-06-0606 June 2024 SNC Slides - Vogtle 3 and 4 - TS 3-8-2 - Pre-Submittal Meeting - 06-27-2024 ML24120A2202024-04-30030 April 2024 Annual Assessment Meeting Presentation Slides - April 30, 2024 ML24089A1492024-04-0404 April 2024 Slides - SNC Presentation - Pre-Submittal Meeting on April 4, 2024 - Proposed Vogtle 3 and 4 TS 3.7.6 LAR ML24060A2732024-03-0707 March 2024 SNC Slides - Pre-Submittal Meeting on March 7, 2024 - Vogtle 3 & 4 TSTF-577 LAR ML24022A1192024-01-24024 January 2024 Slides - SNC Slides - Pre-Submittal Meeting on January 24, 2024 - Vogtle 3 & 4 Explosively Actuated Valves Relief Request ML23361A0812024-01-0808 January 2024 SNC Slides - Pre-Submittal Public Meeting on January 8, 2024 Related to Fleet QATR ML24004A1852024-01-0404 January 2024 SNC Slides - Pre-Submittal Public Meeting on January 8, 2024 Related to Fleet QATR Revised ML23311A2452023-11-0707 November 2023 Pre-Submittal Meeting on November 7, 2023 - License Amendment Request to Revise the Ultimate Heat Sink Mission Time (Slides) ML23304A2682023-11-0707 November 2023 License Amendment Request to Revise the Ultimate Heat Sink Mission Time Pre Submittal Meeting on November 7, 2023 ML23293A0052023-10-20020 October 2023 Lessons Learned from the ITAAC Hearing Process for Vogtle 3 and 4 ML23257A2322023-09-28028 September 2023 SNC Presentation - Pre-Submittal Meeting on September 28, 2023 - Proposed Vogtle 3 and 4 TS 3.7.6 LAR ML23137A1162023-06-0202 June 2023 Draft Slides for Advisory Committee on Reactor Safeguards Subcommittee Meeting Regarding Use of Accident Tolerant Fuel Lead Test Assemblies ML23094A1402023-04-0404 April 2023 4 -- 2022 Aam Slides ML23072A1802023-03-13013 March 2023 2023 RIC Powerpoint Slide Presentation, Vogtle 3: Journey from Construction to Operations ML23055A0402023-02-24024 February 2023 VEGP, Unit 4, Potential License Amendment Request for Prior to Initial Criticality Overview Presentation ML23033A0232023-02-0202 February 2023 Dashboard Report 2-2-2023 ML22335A5542022-12-0101 December 2022 Slides - SNC Slides - Pre-Submittal Meeting on December 1, 2022 - Vogtle SR 3.4.14.1 LAR and Alternative Relief Request - ML22335A0372022-12-0101 December 2022 Dashboard Report 12-1-2022 ML22329A0192022-12-0101 December 2022 Southern Nuclear Company Slides - Pre-Submittal Meeting on December 1, 2022 - Vogtle SR 3.4.14.1 LAR and Alternative Relief Request 1 ML22332A0012022-11-28028 November 2022 SNC Slides - Pre-Submittal Meeting on November 30, 2022 - Vogtle TS 5.5.11 License Amendment Request ML22319A1232022-11-15015 November 2022 Kozak Slides for November 15, 2022 Public Meeting on Part 52 Lessons Learned ML22319A0052022-11-15015 November 2022 NEI Slides for November 15 2022 Public Meeting on Part 52 Lessons Learned ML22319A1242022-11-15015 November 2022 NRC Slides for November 15, 2022 Public Meeting on Part 52 Lessons Learned ML22278A0382022-10-0505 October 2022 Dashboard Report 10-5-2022 ML22251A0002022-09-30030 September 2022 Pre-Submittal Meeting on September 13, 2022 - Vogtle Online Monitoring LAR ML22265A0972022-09-22022 September 2022 Southern Nuclear Company Slides on Lessons Learned from Part 52 Implementation for Public Meeting on 9/27/2022 ML22265A0982022-09-22022 September 2022 NRC Slides on Part 52 Lessons Learned Construction Initiative for Public Meeting on 9/27/2022 ML22206A1712022-07-25025 July 2022 Dashboard Report 7-25-2022 ML22206A1682022-07-25025 July 2022 Dashboard Report 7-25-2022 ML22201A0442022-07-20020 July 2022 Voices Dashboard Report for Vogtle Unit 3 as of July 20, 2022 ML22138A3952022-05-24024 May 2022 Slides - SNC Slides - Pre-Submittal Meeting on May 24, 2022 - Vogtle RR RWST Suction Check Valves ML22144A0492022-05-24024 May 2022 Dashboard Report 5-24-2022 ML22144A0502022-05-24024 May 2022 Dashboard Report 5-24-2022 ML22137A2812022-05-23023 May 2022 Slides - SNC Slides - Pre-Submittal Meeting on May 23, 2022 - Vogtle TS 3.8.1 and TSTF-163 LAR ML22126A0102022-05-11011 May 2022 Pre-Submittal Meeting on May 11, 2022 - Vogtle ATF LTAs LAR and Exemption Requests - Licensing Questions ML22123A3332022-05-10010 May 2022 Pre-Submittal Meeting 2: TSTF-51, TSTF-471, TSTF-490, and Alternative Source Term License Amendment Request - May 10, 2022 (EPID L-2022-LRM-0033)(slides) ML22126A0012022-05-0606 May 2022 SNC Slides - Pre-Submittal Meeting on May 11, 2022 - Vogtle ATF LTAs LAR and Exemptions ML22110A1702022-04-20020 April 2022 4 2022 Annual Assessment Meeting.Final ML22060A0062022-02-28028 February 2022 4Q 2021 Performance Summary U3 ML22021B6472022-01-27027 January 2022 Pre-Submittal for Westinghouse Increased Enrichment Accident Tolerant Fuel Lead Test Assemblies (EPID L-2022-LRM-0003) (Slides) ML22026A0582022-01-26026 January 2022 Dashboard Report 1-26-2022 ML21306A0242021-11-30030 November 2021 SNC Pre-Submittal Meeting for LAR to Relocate Augmented Piping Inspection Program Details from TSs to a Licensee Controlled Document for Farley Nuclear Plant, Units 1 & 2; and Vogtle Electric Generating Plant, Units 1 & 2 (EPID L-2021-LRM-0 ML21333A2172021-11-29029 November 2021 Readiness Group Presentation During 12-2-21 Public Meeting ML21230A2842021-08-18018 August 2021 SNC Slides - Vogtle MSIV Elimination LAR - Pre-submittal Meeting Part 2 - 08-25-2021 ML21197A0032021-08-0606 August 2021 Slides - SNC Slides - Pre-Submittal Meeting on August 13, 2021 - Vogtle TS 3.3.1 and 3.3.2 LAR ML21193A0762021-07-0808 July 2021 ITAAC Related to Incore Instrument Thimble Assembly (Iita) ML21187A0972021-07-0808 July 2021 Late Filed Allegations (Lfa) Process ML21188A3592021-07-0606 July 2021 1Q 2021 Performance Summary U3 ML21188A3612021-07-0606 July 2021 1Q 2021 Performance Summary U4 2024-06-06
[Table view] |
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Vogtle Unit 2 RHR Bypass Line Leaks Root Cause Investigation May 2006
Root Cause Investigation Team Vice President-SNC President SNC Corporate Engineering-Event Engineering Event Team Leader Project Manager-SNC Corporate Engr-Root Cause Team Leader Engineer-SNC Engineer SNC Corporate Materials and Inspection Services Engineering Supv-SNC Farley Engineering Support Training Supv-SNC Vogtle Training Shift Support Supv-SNC Vogtle Operations Engineering Supv-SNC Vogtle Engineering Support Engineer-SNC Vogtle Performance Analysis Principal Engineer-SCG Maintenance Planning- Vibration Instrumentation Engineer-SCG Maintenance Planning- Vibration Instrumentation Principal Engineer-Westinghouse Systems Principal Engineer-Westinghouse Pipe Stress Senior Associate-Structural Integrity Associates Associate-Structural Integrity Associates Engineer-Bechtel-Water/Steam Hammer & Fluid Flow Expert Project Engineer-Bechtel-Pipe Design and Support Engineer-Bechtel-Pipe Design and Support
RHR Bypass Line Leak Locations 12 Vertical 3/20/06 Support 12/9/05 12 2/3/06 Horizontal 2/3/06 Supports 3/4
Weld Repair History for 2HV-8701B flow-restrictor 3/8 Flow Orifice RHR FLOW Half coupling to RHR weld in Half coupling to orifice service since original weld in service since construction Dec 2005, Location of December leak Location of March 2006 leak 1/4 Flow R Orifice H
R Weld build-ups performed during Feb 2006 to make welds comply with 2:1 weld ratio B
Y P
A S
S Orifice to coupling weld in service since October 2002 F
L O Full coupling to RHR bypass line piping in W service since Feb 2006 (weld was made as part of the replacement of RHR bypass line)
Loop 1 RHR Schematic Unit 2, Loop 1 RHR Loop Suction 500 RCS Loop Side RHR Pipe Supports 2HV8701B 255 Bonnet Leakoff line 251 Bypass Pipe Supports 2HV8701A 502 SI Secondary Check Valve 2-1204-U6-128 SI Primary Check Valve 2-1204-U6-126 RHR Pump Side SI Test Header Connection
The Theory 2HV-8701B RHR Loop Suction Line 32Hz Organ Pipe 29.5 Hz Full Full Power Power Vortex Excitation Full Bypass Line Vibration Power 251 255 Bypass line Natural Frequency 29 Hz 2-1204-U6-126 Backseat Backseat Evolution Evolution RCS 2-1204-U6-128 Depressurization Forces Flow SI HL Injection Line SI Test Header When frequencies align, resonance occurs.
7 Factors causing RHR bypass line cracks (based on measurements and observations in Feb 2006)
- 1. RCS Vortex Shedding Frequency across RHR nozzle at RCS
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- 2. Acoustic Frequency of Loop 1 RHR piping
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- 3. Structural Frequency of RHR Bypass Line
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- 4. No Axial Support of Bypass line => Relatively flexible bypass line amplifies RHR piping movement
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- 5. Leaking Safety Injection Primary Check Valve
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- 6. Leaking AOVs in SI Test Header Line (accumulators filling up)
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- 7. SI Check Valve Reseat Procedure = Creates Impulse at Bypass line and 3/4 Check Valve, resulting in valve chatter and higher vibration
The factors contributing to the root causes of the cracks can be condensed into two primary causes.
- 1. The bypass line was flexible and not axially restrained, and
- 2. High vibration at power due to resonance at about 30 Hz, and 3/4 check valve chatter
Other Bypass Lines Whats different on the other RHR bypass lines that they havent cracked?
- Loop 4 of each Unit is not near a resonance condition
Ongoing Actions