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Category:Slides and Viewgraphs
MONTHYEARML24254A3602024-09-10010 September 2024
Pre-Submittal Slides for License Amendment Request, Criticality Safety Analysis, Technical Specification 4.3.1, Criticality and Technical Specification 5.5.14, Spent Fuel Storage Rack Neutron Absorber Monitoring Program
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GG - NRC Slides for the October 4, 2021 Regulatory Performance Meeting and 95002 Supplemental Inspection Exit Meeting
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GG - Entergy Presentation Slides for the October 4, 2021 Regulatory Performance Meeting and 95002 Supplemental Inspection Exit Meeting
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Scale/Melcor Non-LWR Source Term Demonstration Project - High Temperature Gas-Cooled Reactor
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Entergy Operations, Inc. Pre-Submittal Meeting - Grand Gulf Nuclear Station, Unit 1 Relief Request to Adopt Performance-based Testing for Pressure Isolation Valves (Pivs)
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Enc 3 - Entergy Slides for Regulatory Conference December 2020 - Final
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Enc 2 - Grand Gulf Nuclear Station Regulatory Conference December 2020 - NRC Presentation
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Combined Industry and NRC Slides for the December 10, 2020, Public Meeting on Technology Inclusive Content of Application Project, Advanced Reactor Content of Application Project and Applicability of Regulations to Non-Light Water Reactors
ML20269A3452020-09-28028 September 2020
Pre-submittal Meeting for Request for One-Time Exemption from 10 CFR Part 50, Appendix E, Biennial EP Exercise (Offsite) Due to COVID-19- Entergy Presentation Slides
ML20176A3452020-06-24024 June 2020
Slides for Public Meeting Confirmatory Success Criteria Using Grand Gulf Nuclear Station
ML18107A3342018-04-10010 April 2018
Tech Spec 3.3.5.2a Change Pre-Submittal Meeting Presentation Slides
ML18075A1232018-03-20020 March 2018
Entergy Nuclear Operations - March 20, 2018, Presentation Slides for Surveillance Frequency Control Program, UFSAR Change Considerations
ML17318A1592017-11-0808 November 2017
Meeting Slides - November 8, 2017 Teleconference with NEI Concerning Feedback on Tornado Missile Risk Evaluator Methodology -Final
ML17101A4402017-04-11011 April 2017
Summary of Public Meeting with Entergy Operations, Inc. to Discuss Results of the Annual Assessment of Safety Performance at Grand Gulf Nuclear Station for 2016
ML14142A0412014-05-22022 May 2014
NRC Public Meeting Presentation Grand Gulf Flooding Hazard Reevaluation
ML13199A3502013-07-16016 July 2013
Predecisional Enforcement Conference Presentation Slides July 16, 2013
ML12275A5492012-10-0101 October 2012
Summary of Meeting with Entergy Operations, Inc., to Discuss the Performance of the Subject Facilities, Recent Organizational Changes, and Current Regulatory Issues
ML12034A0172012-01-31031 January 2012
License Renewal Process and Environmental Scoping Meeting
ML1109600692011-04-0505 April 2011
Licensee Slides from 4/5/11 Pre-Submittal Meeting with Entergy Operations, Inc. Regarding Changes to TSs and QA Program Manual for Unit Staff Qualifications
ML1003603572010-02-18018 February 2010
Steam Dryer 2/18/10 NRC Presentation, Redacted Version
ML0935201272009-12-18018 December 2009
Nrc/Entergy Operations, Inc., Management Meeting
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Licensee Slides, Extended Power Uprate - Impact on Steam Dryer
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Presentation Slides, SFST June 2009 Monthly Seminar - Operational Experience.
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Entergy Operations, Inc., Project Planning Slides for March 31, 2009, Nrc/Entergy Pre-Application Meeting - Power Uprates
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12/5/06 Public Meeting Handout from Entergy/Epri Re GGNS Application of N-716
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Summary of Meeting with Entergy Operations, Inc., Annual Performance Assessment for Grand Gulf Nuclear Station
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RIC 2006 Presentation - T2E - Vincent Coulehan - Use of Operating Experience (Regulator/Operator/Licensee)
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2006/03/07- - RIC 2006 Presentation - T1F - Garry G. Young - License Renewal
ML0615901582006-03-0707 March 2006
03/07/2006 - RIC 2006 Presentation - T1E - John F. Mccann - License Renewal
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March 1, 2006 Public Meeting Slides for Proposed Generic Letter Post-Fire Safe-Shutdown Circuit Analysis Spurious Actuations.
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Nrc/Entergy Operations, Inc. Management Meeting 11/10/05
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Summary of End of Cycle Public Meeting with Entergy Operations, Inc. on Grand Gulf Nuclear Station Performance for Period of 01/01/2004 - 12/31/2004
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Licensee'S Slides for 04/11/2005 Summary of Category 1 Meeting with Entergy Corporation, to Discuss an Alternate Compliance Strategy for Meeting Fire Wrap Requirements in Certain Plant Areas
ML0422602762004-08-12012 August 2004
Meeting Summary of the August 8, 2004 Public Workshop - Region IV Operator Licensing Feedback
ML0323705292003-08-22022 August 2003
Summary of Nrc/Entergy Operations, Inc. Management Meeting
ML0316400872003-04-28028 April 2003
Summary of Annual Performance Assessment Meeting for Grand Gulf Nuclear Station
ML0210903352002-04-17017 April 2002
Annual Performance Assessment Meeting for Grand Gulf to Discuss Safety Performance at Grand Gulf Between 04/01/2001 & 12/31/2001
2024-09-10
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Text
Public Meeting On Recommendation 2.1 LIP Analysis for Grand Gulf May 22, 2014, 2pm - 3:30pm EST Lance Vail Pacific Northwest National Laboratory Grand Gulf 2.1 LIP Analysis Review 1
Local Intense Precipitation (LIP)
Flood
- Flooding from intense storm over the site
- Relies primary on local topography for drainage
- Often assumes culverts and roof drains are completely blocked.
- Not associated with river or stream flood
- Multiple locations (depths versus locations)
- Lead time and duration considerations
- Generally LIP not included in UFSARs for existing fleet
- Included in all ESP/COLA reviews with 1-d analysis
- Generally small margins Grand Gulf 2.1 LIP Analysis Review 2
Grand Gulf LIP Flood Review
- Our review focused on implementation of
- Vehicle barrier system (VBS) structures Grand Gulf 2.1 LIP Analysis Review 3
Review History
- Culvert blockage issue identified (justification of % blockage assumed and implementation)
- Staff reviewed RAI input and output files
- Staff were unable to reproduce results with most current FLO-2D version -
higher water elevations
- Staff were unable to reproduce results with even more current version -
higher water elevations
- Identified serious mass balance errors in more recent versions
- Identified stability issues
- Obtained exact version used by licensee
- Staff were able to reproduce licensee results
- Identified measure of mass balance error an indicator of improper configuration
- Identified issues with GG model configuration
- Determined that roof drainage is entirely routed out of domain Grand Gulf 2.1 LIP Analysis Review 4
Representing Drainage From Building Roofs
Roof drainage contributions to the surface runoff during the PMP event shall be evaluated to determine the worst case for site surface drainage effects. Blockage of roof drains and the resulting release of flow from the roof at alternative points shall be evaluated.
- Description of how roof drainage representation is consistent with ANSI/ANS-2.8-1992 Section 11.4
- Demonstration that simulation properly account for roof drainage Grand Gulf 2.1 LIP Analysis Review 5
Representing Roof Drainage in FLO-2D
- Grand Gulf: licensee completely blocked grid cells containing buildings in FLO-2D
- Version 12 [Build 12.09.01] - Precipitation falling on roofs is instantaneously routed out of analysis domain
- Version 13 [Build 13.11.06] - Precipitation falling on roofs is accumulated on roof
- Version 14 [Build 14.03.07] - Precipitation falling on roofs is drained off roof
- Frequently updated code with slowly changing documentation
- Staffs review needs demonstration of roof simulation Grand Gulf 2.1 LIP Analysis Review 6
Representing Culvert Blockage
- Grand Gulf FHRR describes LIP flooding approach as
- Estimate unobstructed flow
- Scale to 50% blockage flow through culverts
- Licensee states 50% blockage was basis of LIP flood determination
- Stage-flow representations in input data only for unobstructed culverts
- Demonstration that 50% blockage of culverts was implemented consistent with FHRR description Grand Gulf 2.1 LIP Analysis Review 7
Successful Model Application
- Staff are following simulation review guidance provided by the FLO-2D reference manual Section 5.3 and Data Input Manual Section 1.6, which provide three keys to a successful application:
- volume conservation
- area of inundation
- maximum velocities and numerical surging
- Grand Gulf FLO-2D application was not successful based on the three keys for a successful application
- Staffs review needs a demonstration that the FLO-2D simulation(s) met the three keys Grand Gulf 2.1 LIP Analysis Review 8
