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| {{#Wiki_filter:Public Meeting on FLEX and RIDM Insights from Implementing FLEX in the Peach Bottom Seismic PRA Model November 15, 2017 Don Vanover Phil Tarpinian Overview Purpose - Determine the benefit of crediting FLEX in the PBAPS internal events and seismic PRA models Discussion points FLEX Related Procedure Changes FLEX Alternatives Modeled Preliminary Full Power Internal Events Results and Insights Preliminary Seismic PRA Model Results and Insights Conclusions and Recommendations 2 FLEX Related Procedures 3 SE-11 provides direction in all LOOP scenarios at PBAPS Extended Loss of Offsite Power (ELAP) declaration at 1 hour if power not restored to any 4 kV bus (Sheet 5) Key Actions Identified from ELAP Sheet 6 from SE-11 FLEX Alternatives Modeled DC load shed commences early in SE-11 prior to declaration of ELAP Battery calculation review indicated that performance of these initial steps would be sufficient to avoid LERF potential if HPCI or RCIC is available ELAP declaration results in additional load shedding steps to further extend battery life for deployment of FLEX generators Bundled execution steps by impacted DC panels Alignment of FLEX Generators to Div I 480 VAC Allows for RPV depressurization capabilities via SRVs Allows for continued RCIC operation with DC available FLEX pump alignment Allows for RPV injection or Makeup to torus With RCIC initially available, either leads to long term success state 4 FLEX Related Human Failure Events *NEI 16-06 Attributes 5 HEP Description Feasible in Scenario Available and Reliable Time Margin Command and Control Environ-mental Conditions Operators Fail DC Load Shed (SBO, Div I Only) SBO Yes Yes SE-11, Att. T Varies Operators Fail DC Load Shed (ELAP) ELAP Yes Yes FSG-012 Varies Operators Fail to Align Flex Generator to Div I ELAP Yes Yes FSG-010 FSG-011 Varies Operator Fails to Partially Depressurize RPV and Vent Cont. to Prolong RCIC SBO Yes Yes T-101 T-102 Varies Operators Fail to Align Flex Flow Path to RPV ELAP Yes Yes FSG-040 FSG-041 Varies FLEX Related Human Error Probabilities HEP Description FPIE Value SPRA Value Operators Fail DC Load Shed (SBO, Div I Only) 2.5E-02 5.2E-02 Operators Fail DC Load Shed (ELAP) 3.8E-02 9.8E-02 Operators Fail to Align Flex Generator to Div I 3.6E-02 3.7E-02 Operator Fails to Partially Depressurize RPV and Vent Cont. to Prolong RCIC (<7.2E-02) 7.2E-02 Operators Fail to Align Flex Flow Path to RPV 2.5E-02 2.5E-02 *Values Obtained Using EPRI HRA Approach 6 FLEX Related Human Error Probabilities Deep load shed action more significantly impacted for seismic since Only one EO is available Action needs to be completed as soon as possible - little margin normally available for success High workload assumed for seismic vs. moderate for FPIE Leveraged availability of the FLEX procedures, training, and timing validation for Peach Bottom Allowed detail to first be developed for the FPIE FLEX actions Required little change/enhancement for seismic 7 FLEX Related Human Error Probabilities FLEX actions are considered to apply across all HRA damage state bins because the SSCs that drive the individual bin adjustments become irrelevant for FLEX Operators would proceed to FLEX actions on the ELAP basis of no 4kV bus being able to be repowered within 1 hour regardless of the seismic bin-related SSC failures Since the whole idea of FLEX is for this type of catastrophic event, applying the individual seismic bin adjustments is not necessary 8 SBO SEQUENCE LOGIC Extended RPV Depressurization Continued RCIC or FLEX Injection DC load shed required for alignment of generators Alignment of generators required for extended RPV depressurization and continued RCIC operation 9 FPIE RESULTS Full Power Internal Events Results Benefit consistent with SBO contribution w/ HPCI or RCIC Available ~10% CDF reduction from SBO and SBO-like conditions (i.e., LOOP and CCF of EDGs, or Trip and CCF of 4 kV buses) ~10% LERF reduction from similar scenarios Additional credit could be obtained if credit for FLEX generators was not limited to ELAP scenarios Case Description CDF Value LERF Value Unit 2 w/ No Credit for FLEX 3.4E-06 / yr 4.9E-07 / yr Unit 2 w/ Credit for FLEX in ELAP scenarios 3.0E-06 / yr 4.4E-07 / yr 10 Seismic PRA Model Results Site considering many options for finalization Currently limited by relatively flat hazard curve at high g levels SPRA RESULTS Case Description CDF Value LERF Value Base Case w/ No Credit for FLEX 2.0E-5 / yr 3.9E-6 / yr Base Case w/ Credit for FLEX 1.9E-5 / yr 3.7E-6 / yr 11 1E-71E-61E-51E-41E-31E-200.10.20.30.40.50.60.70.80.911.11.21.31.41.51.61.71.81.92Annual Freq. of Exceedance Peak Ground Acceleration, g SSE IPEEE RLE SSE IPEEE RLE SUMMARY Conclusions Reduction in CDF and LERF values can be obtained in internal events and seismic results with nominal credit for FLEX systems when procedurally directed HRA benefited from strong inputs; specifically validation, procedures, and training Seismic benefit limited by unique site hazard curve (that is relatively flat at high g levels) Recommendations Work with site to help optimize path forward for SPRA model completion As FPRA update is completed, identify when alignment of FLEX generators may be beneficial to include in the Fire Area Safe Shutdown Guides 12 Additional Questions? dvanover@jensenhughes.com Philip.Tarpinian@Exloncorp.com 13}} | | {{#Wiki_filter:Public Meeting on FLEX and RIDM Insights from Implementing FLEX in the Peach Bottom Seismic PRA Model November 15, 2017 Don Vanover Phil Tarpinian |
| | |
| | Overview Purpose - Determine the benefit of crediting FLEX in the PBAPS internal events and seismic PRA models Discussion points FLEX Related Procedure Changes FLEX Alternatives Modeled Preliminary Full Power Internal Events Results and Insights Preliminary Seismic PRA Model Results and Insights Conclusions and Recommendations 2 |
| | FLEX Related Procedures 3 SE-11 provides direction in all LOOP scenarios at PBAPS Extended Loss of Offsite Power (ELAP) declaration at 1 hour if power not restored to any 4 kV bus (Sheet 5) |
| | Key Actions Identified from ELAP Sheet 6 from SE |
| | -11 FLEX Alternatives Modeled DC load shed commences early in SE |
| | -11 prior to declaration of ELAP Battery calculation review indicated that performance of these initial steps would be sufficient to avoid LERF potential if HPCI or RCIC is available ELAP declaration results in additional load shedding steps to further extend battery life for deployment of FLEX generators Bundled execution steps by impacted DC panels Alignment of FLEX Generators to Div I 480 VAC Allows for RPV depressurization capabilities via SRVs Allows for continued RCIC operation with DC available FLEX pump alignment Allows for RPV injection or Makeup to torus With RCIC initially available, either leads to long term success state 4 |
| | FLEX Related Human Failure Events |
| | *NEI 16-06 Attributes 5 HEP Description Feasible in Scenario Available and Reliable Time Margin Command and Control Environ-mental Conditions Operators Fail DC Load Shed (SBO, Div I Only) SBO Yes Yes SE-11, Att. T Varies Operators Fail DC Load Shed (ELAP) |
| | ELAP Yes Yes FSG-012 Varies Operators Fail to Align Flex Generator to Div I ELAP Yes Yes FSG-010 FSG-011 Varies Operator Fails to Partially Depressurize RPV and Vent Cont. to Prolong RCIC SBO Yes Yes T-101 T-102 Varies Operators Fail to Align Flex Flow Path to RPV ELAP Yes Yes FSG-040 FSG-041 Varies FLEX Related Human Error Probabilities HEP Description FPIE Value SPRA Value Operators Fail DC Load Shed (SBO, Div I Only) 2.5E-02 5.2E-02 Operators Fail DC Load Shed (ELAP) 3.8E-02 9.8E-02 Operators Fail to Align Flex Generator to Div I 3.6E-02 3.7E-02 Operator Fails to Partially Depressurize RPV and Vent Cont. to Prolong RCIC |
| | (<7.2E-02) 7.2E-02 Operators Fail to Align Flex Flow Path to RPV 2.5E-02 2.5E-02 *Values Obtained Using EPRI HRA Approach 6 |
| | FLEX Related Human Error Probabilities Deep load shed action more significantly impacted for seismic since Only one EO is available Action needs to be completed as soon as possible |
| | - little margin normally available for success High workload assumed for seismic vs. moderate for FPIE Leveraged availability of the FLEX procedures, training, and timing validation for Peach Bottom Allowed detail to first be developed for the FPIE FLEX actions Required little change/enhancement for seismic 7 |
| | FLEX Related Human Error Probabilities FLEX actions are considered to apply across all HRA damage state bins because the SSCs that drive the individual bin adjustments become irrelevant for FLEX Operators would proceed to FLEX actions on the ELAP basis of no 4kV bus being able to be repowered within 1 hour regardless of the seismic bin-related SSC failures Since the whole idea of FLEX is for this type of catastrophic event, applying the individual seismic bin adjustments is not necessary 8 |
| | SBO SEQUENCE LOGIC Extended RPV Depressurization Continued RCIC or FLEX Injection DC load shed required for alignment of generators Alignment of generators required for extended RPV depressurization and continued RCIC operation 9 |
| | FPIE RESULTS Full Power Internal Events Results Benefit consistent with SBO contribution w/ HPCI or RCIC Available |
| | ~10% CDF reduction from SBO and SBO |
| | -like conditions (i.e., LOOP and CCF of EDGs, or Trip and CCF of 4 kV buses) |
| | ~10% LERF reduction from similar scenarios Additional credit could be obtained if credit for FLEX generators was not limited to ELAP scenarios Case Description CDF Value LERF Value Unit 2 w/ No Credit for FLEX 3.4E-06 / yr 4.9E-07 / yr Unit 2 w/ |
| | Credit for FLEX in ELAP scenarios 3.0E-06 / yr 4.4E-07 / yr 10 Seismic PRA Model Results Site considering many options for finalization Currently limited by relatively flat hazard curve at high g levels SPRA RESULTS Case Description CDF Value LERF Value Base Case w/ No Credit for FLEX 2.0E-5 / yr 3.9E-6 / yr Base Case w/ |
| | Credit for FLEX 1.9E-5 / yr 3.7E-6 / yr 11 1E-71E-61E-51E-41E-31E-200.10.20.30.40.50.60.70.80.911.11.21.31.41.51.61.71.81.92Annual Freq. of Exceedance Peak Ground Acceleration, g SSE IPEEE RLE SSE IPEEE RLE SUMMARY Conclusions Reduction in CDF and LERF values can be obtained in internal events and seismic results with nominal credit for FLEX systems when procedurally directed HRA benefited from strong inputs; specifically validation, procedures, and training Seismic benefit limited by unique site hazard curve (that is relatively flat at high g levels) |
| | Recommendations Work with site to help optimize path forward for SPRA model completion As FPRA update is completed, identify when alignment of FLEX generators may be beneficial to include in the Fire Area Safe Shutdown Guides 12 Additional Questions |
| | ? dvanover@jensenhughes.com Philip.Tarpinian@Exloncorp.com 13}} |
Revision as of 09:56, 29 June 2018
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Category:Meeting Briefing Package/Handouts
MONTHYEARML24200A2312024-07-22022 July 2024 Constellations Pre-Submittal Meeting Presentation About Peach Bottom ECCS Compensated Level System Replacement Project - July 22, 2024 ML24137A1882024-05-16016 May 2024 Annual Assessment Meeting for Pa/Md/Ny/Nj Nuclear Power Plants - NRC Presentation Slides ML24131A1282024-05-14014 May 2024 Lessons Learned for ECCS Digital I&C License Amendment ML24121A1862024-05-14014 May 2024 Attachment 3: Peach Bottom ECCS Compensated Level System Replacement Project Presentation Material (Non-Proprietary Information) ML24134A2032024-05-14014 May 2024 Lessons Learned for ECCS Digital I&C License Amendment - Rev 0 ML24100A7672024-04-11011 April 2024 Meeting Slides - Preapplication with Constellation on Planned Fleet Alternative Request to Adopt OMN-2 ML24089A2612024-04-0909 April 2024 Slides - Constellation - Pre-Application Regarding Hooded Masks 4/9/2024 Meeting Slides (L-2024-LLM-0041) ML24029A1742024-01-30030 January 2024 Constellation Pre-Application January 30, 2024, Meeting Slides - Proposed Alternative to Utilize Code Case N-932, Alternative Requirements for Acceptance of Containment Base Metal Corrosion or Erosion ML23317A0712023-11-14014 November 2023 NRC Pre-Submittal Meeting on November 14th, 2023 - TSTF-591 and Selected 50.69 License Condition Updates (EPID L-2023-LLM-0098) (Slides) ML23255A1042023-08-11011 August 2023 Slides - Constellation - Pre-Application EP 9/18/2023 Draft CEG Presubmittal SG Performance Monitoring Plan Meeting Handout ML23170A0082023-06-29029 June 2023 Decommissioning Presentation for NRC Pre-submittal Meeting, June 29, 2023 ML23157A0352023-06-0606 June 2023 Annual Assessment Meeting for Pa/Md/Ny/Nj Nuclear Power Plants - NRC Presentation Slides ML23094A1492023-04-11011 April 2023 Licensee Presentation on Whr Exemption Request for Public Meeting on April 11, 2023 ML23076A0442023-03-16016 March 2023 Pb U2 Scram Barrier Presentation KT Session ML21314A4472021-11-10010 November 2021 Slides for Presubmittial Meeting for Proposed Alternative to Adopt ASME Code Case N-921 to Extend the Inservice Inspection Interval ML21165A1942021-06-16016 June 2021 Joint Annual Assessment Meeting for Pa/Md/Nj/Ny Nuclear Power Plants - Webinar Presentation ML21165A2882021-06-16016 June 2021 Joint Annual Assessment for Pa/Md/Nj/Ny Nuclear Power Plants - Webinar Presentation (Updated) ML21095A0162021-04-0505 April 2021 2021 RIC Session T12 - DOE-Sponsored Light Water Reactor Sustainability Program ML20261G7322020-09-16016 September 2020 Pre-Submittal Slides Extend 120-month Isi/Ist Interval Under 50.55a ML20178A4202020-06-30030 June 2020 NEI Slides for June 30, 2020, Public Meeting on COVID-19 Response ML20170B0212020-06-23023 June 2020 NRC Pre-Submittal Meeting Byron Unit 2 One-Time Deferral of Reactor Pressure Vessel Head Penetration Nozzle (Rpvhpn) Inspections ML20175A8722020-06-23023 June 2020 Risk-Informed Inservice Inspection - U.S Nuclear Regulatory Commission (NRC) - Four Element Risk-Informed Approach ML20163A6552020-06-16016 June 2020 6-16-20 Byron Unit 2 Steam Generator License Amendment Request Pre-Submittal Meeting (NRC) - Byron Unit 2 LAR for One-Time Deferral of Steam Generator Inspections ML20169A5592020-06-16016 June 2020 Steam Generator License Amendment Request Pre-Submittal Meeting (NRC) - Byron Unit 2 LAR for One-Time Deferral of Steam Generator Inspections (Rev 1) ML20168A3192020-06-15015 June 2020 Joint Annual Assessment Meeting for Pa/Md Power Plants - Webinar Presentation ML19318F9512019-11-20020 November 2019 Presentation Slides for November 20, 2019, Pre-Application Meeting - Request for Revision to Quality Assurance Program Internal Audit Frequency ML19317C9952019-11-12012 November 2019 In-Service Testing Supplemental Position Indication Relief Request NRC Pre-Application Meeting November 18, 2019 ML19308B9262019-11-0505 November 2019 ACRS Plant License Renewal Subcommittee - Peach Bottom Atomic Power Station Units 2 and 3 Subsequent License Renewal Safety Evaluation Report (SER) with Confirmatory Item ML19256E3852019-09-12012 September 2019 SLR Dseis Public Meeting Sept 12 2019 - Scott Portzline - Former Three Mile Island Alert Presentation ML19256E3522019-09-12012 September 2019 Slides - Peach Bottom SLRA Dseis Public Meeting - Sep 12 2019 ML19157A0542019-06-0606 June 2019 Joint Annual Assessment Meeting (Webinar) for Pennsylvania Power Plants - NRC Presentation Slides ML19161A2572019-06-0404 June 2019 BWR Fleet Msv/Srv - Testing Frequency Relief Request NRC Pre-Application Meeting June 4, 2019 ML19151A6602019-05-31031 May 2019 BWR Fleet Mssv/Srv Testing Frequency Relief Request NRC Pre-Application Meeting June 4, 2019 ML19084A0982019-03-22022 March 2019 Potential Topics for Pre-Application Meetings for Peach Bottom SLRA ML19022A2002019-01-23023 January 2019 Request for Use of ASME Code Case N-879 for Exelon Nuclear Power Plants ML18347B3142018-12-19019 December 2018 Bwrvip/Asme Relief Request Discussion December 19, 2018 ML18334A2162018-11-30030 November 2018 Presentation Slides: Exelon BWR MSIV (Boiling-Water Reactor - Main Steam Isolation Valve) Leakage Optimization for NRC Pre-Submittal Meeting of December 6, 2018 ML18319A1272018-11-19019 November 2018 Slides for 11/19/18 Public Meeting - Exelon Fleet LAR for Common Language for TS 5.7 High Radiation Areas ML18144A6932018-05-31031 May 2018 License Amendment Request for Expanded Actions for LEFM Flow Meter Conditions - NRC Pre-Submittal Meeting May 31, 2018 ML18141A3072018-05-21021 May 2018 18 - SLR Status ML18054B3592018-02-27027 February 2018 Slide: NRC Pre-Submittal Meeting for Exelon Fleet LAR to Relocate TS Unit Staff Qualification ANSI Requirements to the QATR, February 27, 2018, Profile Info: Submitted by Frank Mascitelli ML17320A2002017-11-15015 November 2017 Insights from Implementing FLEX in the Peach Bottom Seismic PRA Model ML17257A1612017-09-19019 September 2017 September 19, 2017 Pre-application Public Meeting Presentation on Peach Bottom Subsequent License Renewal Application ML17142A2382017-05-25025 May 2017 OEDO-17-00280 - Briefing Package for Drop-In Visit on June 9, 2017, by Senior Management of Exelon Generation Company, LLC with Chairman Svinicki, Commissioner Baran, and Commissioner Burns ML16077A1562016-03-22022 March 2016 Fleet: Pre-application Teleconference with Exelon to Discuss a Potential License Amendment Request Regarding Operating Training Standards ML16075A3292016-03-16016 March 2016 OEDO-16-00165 - Briefing Package for Drop-In Visit on March 23, 2016, by Senior Management of Exelon Generation Company, LLC with the NRC Executive Director for Operations ML12159A2662012-06-11011 June 2012 County Generating Station Pre-Application Meeting Extended Power Uprate: Replacement Steam Dryers. June 11, 2012 ML12130A0992012-05-0909 May 2012 Annual Assessment Meeting Slides Presentation Rev. 0, 2012 ML12130A1172012-05-0909 May 2012 Pb 2012 Public Mtg Attendance Sheet April 2012 ML1208701402012-03-27027 March 2012 Licensee Slides for Exelon Fleet Pre-Submittal Public Meeting 4-10-12 Licensed Operator Eligibility Requirements LAR 2024-07-22
[Table view] Category:Slides and Viewgraphs
MONTHYEARML24200A2312024-07-22022 July 2024 Constellations Pre-Submittal Meeting Presentation About Peach Bottom ECCS Compensated Level System Replacement Project - July 22, 2024 ML24137A1882024-05-16016 May 2024 Annual Assessment Meeting for Pa/Md/Ny/Nj Nuclear Power Plants - NRC Presentation Slides ML24131A1282024-05-14014 May 2024 Lessons Learned for ECCS Digital I&C License Amendment ML24121A1862024-05-14014 May 2024 Attachment 3: Peach Bottom ECCS Compensated Level System Replacement Project Presentation Material (Non-Proprietary Information) ML24134A2032024-05-14014 May 2024 Lessons Learned for ECCS Digital I&C License Amendment - Rev 0 ML24100A7672024-04-11011 April 2024 Meeting Slides - Preapplication with Constellation on Planned Fleet Alternative Request to Adopt OMN-2 ML24089A2612024-04-0909 April 2024 Slides - Constellation - Pre-Application Regarding Hooded Masks 4/9/2024 Meeting Slides (L-2024-LLM-0041) ML24029A1742024-01-30030 January 2024 Constellation Pre-Application January 30, 2024, Meeting Slides - Proposed Alternative to Utilize Code Case N-932, Alternative Requirements for Acceptance of Containment Base Metal Corrosion or Erosion ML23317A0712023-11-14014 November 2023 NRC Pre-Submittal Meeting on November 14th, 2023 - TSTF-591 and Selected 50.69 License Condition Updates (EPID L-2023-LLM-0098) (Slides) ML23251A0782023-09-0606 September 2023 DRE1 Decom Pre-Submittal Slides ML23255A1042023-08-11011 August 2023 Slides - Constellation - Pre-Application EP 9/18/2023 Draft CEG Presubmittal SG Performance Monitoring Plan Meeting Handout ML23170A0082023-06-29029 June 2023 Decommissioning Presentation for NRC Pre-submittal Meeting, June 29, 2023 ML23157A0352023-06-0606 June 2023 Annual Assessment Meeting for Pa/Md/Ny/Nj Nuclear Power Plants - NRC Presentation Slides ML23094A1492023-04-11011 April 2023 Licensee Presentation on Whr Exemption Request for Public Meeting on April 11, 2023 ML23076A0442023-03-16016 March 2023 Pb U2 Scram Barrier Presentation KT Session NEI 99-01, Slides - Constellation - Pre-Application EP 2/23/2023 Meeting Slides2023-02-21021 February 2023 Slides - Constellation - Pre-Application EP 2/23/2023 Meeting Slides ML21314A4472021-11-10010 November 2021 Slides for Presubmittial Meeting for Proposed Alternative to Adopt ASME Code Case N-921 to Extend the Inservice Inspection Interval ML21165A1942021-06-16016 June 2021 Joint Annual Assessment Meeting for Pa/Md/Nj/Ny Nuclear Power Plants - Webinar Presentation ML21165A2882021-06-16016 June 2021 Joint Annual Assessment for Pa/Md/Nj/Ny Nuclear Power Plants - Webinar Presentation (Updated) ML21162A3322021-06-11011 June 2021 BWR Fleet Relief Request Associated with RPV Instrument Nozzle Repairs ML20261G7322020-09-16016 September 2020 Pre-Submittal Slides Extend 120-month Isi/Ist Interval Under 50.55a ML20178A4202020-06-30030 June 2020 NEI Slides for June 30, 2020, Public Meeting on COVID-19 Response ML20170B0212020-06-23023 June 2020 NRC Pre-Submittal Meeting Byron Unit 2 One-Time Deferral of Reactor Pressure Vessel Head Penetration Nozzle (Rpvhpn) Inspections ML20175A8722020-06-23023 June 2020 Risk-Informed Inservice Inspection - U.S Nuclear Regulatory Commission (NRC) - Four Element Risk-Informed Approach ML20163A6542020-06-18018 June 2020 2020 NRC Annual Assessment Webinar Presentation - Pennsylvania and Maryland Facilities (Beaver Valley, Calvert Cliffs, Limerick, Peach Bottom, Susquehanna) ML20169A5592020-06-16016 June 2020 Steam Generator License Amendment Request Pre-Submittal Meeting (NRC) - Byron Unit 2 LAR for One-Time Deferral of Steam Generator Inspections (Rev 1) ML20163A6552020-06-16016 June 2020 6-16-20 Byron Unit 2 Steam Generator License Amendment Request Pre-Submittal Meeting (NRC) - Byron Unit 2 LAR for One-Time Deferral of Steam Generator Inspections ML20168A3192020-06-15015 June 2020 Joint Annual Assessment Meeting for Pa/Md Power Plants - Webinar Presentation ML19308B9262019-11-0505 November 2019 ACRS Plant License Renewal Subcommittee - Peach Bottom Atomic Power Station Units 2 and 3 Subsequent License Renewal Safety Evaluation Report (SER) with Confirmatory Item ML19256E3522019-09-12012 September 2019 Slides - Peach Bottom SLRA Dseis Public Meeting - Sep 12 2019 ML19256E3852019-09-12012 September 2019 SLR Dseis Public Meeting Sept 12 2019 - Scott Portzline - Former Three Mile Island Alert Presentation ML19157A0542019-06-0606 June 2019 Joint Annual Assessment Meeting (Webinar) for Pennsylvania Power Plants - NRC Presentation Slides ML18347B3142018-12-19019 December 2018 Bwrvip/Asme Relief Request Discussion December 19, 2018 ML18334A2162018-11-30030 November 2018 Presentation Slides: Exelon BWR MSIV (Boiling-Water Reactor - Main Steam Isolation Valve) Leakage Optimization for NRC Pre-Submittal Meeting of December 6, 2018 ML18319A1272018-11-19019 November 2018 Slides for 11/19/18 Public Meeting - Exelon Fleet LAR for Common Language for TS 5.7 High Radiation Areas ML18275A3712018-09-25025 September 2018 Subsequent License Renewal Environmental Scoping Meeting 9-25-18 ML18141A3072018-05-21021 May 2018 18 - SLR Status ML18054B3592018-02-27027 February 2018 Slide: NRC Pre-Submittal Meeting for Exelon Fleet LAR to Relocate TS Unit Staff Qualification ANSI Requirements to the QATR, February 27, 2018, Profile Info: Submitted by Frank Mascitelli ML18017A1172018-01-18018 January 2018 NRC PBAPS SLRA Pre-Submittal Meeting Jan 2018 PM Copy ML17320A2002017-11-15015 November 2017 Insights from Implementing FLEX in the Peach Bottom Seismic PRA Model ML17257A1612017-09-19019 September 2017 September 19, 2017 Pre-application Public Meeting Presentation on Peach Bottom Subsequent License Renewal Application ML16106A2792016-04-15015 April 2016 Meeting Slides for License Amendment Request for Measurement Uncertainty Recapture Uprate NRC Pre-Submittal Meeting April 26, 2016 ML16077A1562016-03-22022 March 2016 Fleet: Pre-application Teleconference with Exelon to Discuss a Potential License Amendment Request Regarding Operating Training Standards ML13255A3762013-09-16016 September 2013 Soarca Peach Bottom Uncertainty Analysis (UA) Acrc Briefing - Sept 2013 ML12159A2662012-06-11011 June 2012 County Generating Station Pre-Application Meeting Extended Power Uprate: Replacement Steam Dryers. June 11, 2012 ML12130A0992012-05-0909 May 2012 Annual Assessment Meeting Slides Presentation Rev. 0, 2012 ML12124A0782012-04-26026 April 2012 Power Point Presentation: Peach Bottom - Timing and Criteria for RCS Failure ML1208701402012-03-27027 March 2012 Licensee Slides for Exelon Fleet Pre-Submittal Public Meeting 4-10-12 Licensed Operator Eligibility Requirements LAR NRC-2012-0022, Comment (18) of Scott D. Portzline on Behalf of Three Mile Island Alert, on State of the Art Reactor Consequence Analyses (Soarca) Reports2012-02-28028 February 2012 Comment (18) of Scott D. Portzline on Behalf of Three Mile Island Alert, on State of the Art Reactor Consequence Analyses (Soarca) Reports ML12262A4762012-02-22022 February 2012 TMI Alert Portzline Presentation NUREG-0654 Public Mtg 2024-07-22
[Table view] |
Text
Public Meeting on FLEX and RIDM Insights from Implementing FLEX in the Peach Bottom Seismic PRA Model November 15, 2017 Don Vanover Phil Tarpinian
Overview Purpose - Determine the benefit of crediting FLEX in the PBAPS internal events and seismic PRA models Discussion points FLEX Related Procedure Changes FLEX Alternatives Modeled Preliminary Full Power Internal Events Results and Insights Preliminary Seismic PRA Model Results and Insights Conclusions and Recommendations 2
FLEX Related Procedures 3 SE-11 provides direction in all LOOP scenarios at PBAPS Extended Loss of Offsite Power (ELAP) declaration at 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> if power not restored to any 4 kV bus (Sheet 5)
Key Actions Identified from ELAP Sheet 6 from SE
-11 FLEX Alternatives Modeled DC load shed commences early in SE
-11 prior to declaration of ELAP Battery calculation review indicated that performance of these initial steps would be sufficient to avoid LERF potential if HPCI or RCIC is available ELAP declaration results in additional load shedding steps to further extend battery life for deployment of FLEX generators Bundled execution steps by impacted DC panels Alignment of FLEX Generators to Div I 480 VAC Allows for RPV depressurization capabilities via SRVs Allows for continued RCIC operation with DC available FLEX pump alignment Allows for RPV injection or Makeup to torus With RCIC initially available, either leads to long term success state 4
FLEX Related Human Failure Events
- NEI 16-06 Attributes 5 HEP Description Feasible in Scenario Available and Reliable Time Margin Command and Control Environ-mental Conditions Operators Fail DC Load Shed (SBO, Div I Only) SBO Yes Yes SE-11, Att. T Varies Operators Fail DC Load Shed (ELAP)
ELAP Yes Yes FSG-012 Varies Operators Fail to Align Flex Generator to Div I ELAP Yes Yes FSG-010 FSG-011 Varies Operator Fails to Partially Depressurize RPV and Vent Cont. to Prolong RCIC SBO Yes Yes T-101 T-102 Varies Operators Fail to Align Flex Flow Path to RPV ELAP Yes Yes FSG-040 FSG-041 Varies FLEX Related Human Error Probabilities HEP Description FPIE Value SPRA Value Operators Fail DC Load Shed (SBO, Div I Only) 2.5E-02 5.2E-02 Operators Fail DC Load Shed (ELAP) 3.8E-02 9.8E-02 Operators Fail to Align Flex Generator to Div I 3.6E-02 3.7E-02 Operator Fails to Partially Depressurize RPV and Vent Cont. to Prolong RCIC
(<7.2E-02) 7.2E-02 Operators Fail to Align Flex Flow Path to RPV 2.5E-02 2.5E-02 *Values Obtained Using EPRI HRA Approach 6
FLEX Related Human Error Probabilities Deep load shed action more significantly impacted for seismic since Only one EO is available Action needs to be completed as soon as possible
- little margin normally available for success High workload assumed for seismic vs. moderate for FPIE Leveraged availability of the FLEX procedures, training, and timing validation for Peach Bottom Allowed detail to first be developed for the FPIE FLEX actions Required little change/enhancement for seismic 7
FLEX Related Human Error Probabilities FLEX actions are considered to apply across all HRA damage state bins because the SSCs that drive the individual bin adjustments become irrelevant for FLEX Operators would proceed to FLEX actions on the ELAP basis of no 4kV bus being able to be repowered within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> regardless of the seismic bin-related SSC failures Since the whole idea of FLEX is for this type of catastrophic event, applying the individual seismic bin adjustments is not necessary 8
SBO SEQUENCE LOGIC Extended RPV Depressurization Continued RCIC or FLEX Injection DC load shed required for alignment of generators Alignment of generators required for extended RPV depressurization and continued RCIC operation 9
FPIE RESULTS Full Power Internal Events Results Benefit consistent with SBO contribution w/ HPCI or RCIC Available
~10% CDF reduction from SBO and SBO
-like conditions (i.e., LOOP and CCF of EDGs, or Trip and CCF of 4 kV buses)
~10% LERF reduction from similar scenarios Additional credit could be obtained if credit for FLEX generators was not limited to ELAP scenarios Case Description CDF Value LERF Value Unit 2 w/ No Credit for FLEX 3.4E-06 / yr 4.9E-07 / yr Unit 2 w/
Credit for FLEX in ELAP scenarios 3.0E-06 / yr 4.4E-07 / yr 10 Seismic PRA Model Results Site considering many options for finalization Currently limited by relatively flat hazard curve at high g levels SPRA RESULTS Case Description CDF Value LERF Value Base Case w/ No Credit for FLEX 2.0E-5 / yr 3.9E-6 / yr Base Case w/
Credit for FLEX 1.9E-5 / yr 3.7E-6 / yr 11 1E-71E-61E-51E-41E-31E-200.10.20.30.40.50.60.70.80.911.11.21.31.41.51.61.71.81.92Annual Freq. of Exceedance Peak Ground Acceleration, g SSE IPEEE RLE SSE IPEEE RLE SUMMARY Conclusions Reduction in CDF and LERF values can be obtained in internal events and seismic results with nominal credit for FLEX systems when procedurally directed HRA benefited from strong inputs; specifically validation, procedures, and training Seismic benefit limited by unique site hazard curve (that is relatively flat at high g levels)
Recommendations Work with site to help optimize path forward for SPRA model completion As FPRA update is completed, identify when alignment of FLEX generators may be beneficial to include in the Fire Area Safe Shutdown Guides 12 Additional Questions
? dvanover@jensenhughes.com Philip.Tarpinian@Exloncorp.com 13