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Category:Meeting Briefing Package/Handouts
MONTHYEARML19018A0072019-01-18018 January 2019 Watts Bar Nuclear Plant (WBN)Pre-Submittal Meeting for Proposed License Amendment Request Regarding a One-Time Change for the WBN Unit 2 Technical Specification (TS) 3.7.8, Essential Raw Cooling Water (ERCW) System. ML18291A5732018-10-18018 October 2018 Watts Bar Chilled Work Environment ML18291A5632018-10-18018 October 2018 Watts Bar, Chilled Worked Environment Update ML18248A1072018-09-0505 September 2018 Presentation Slides - Watts Bar Nuclear Plant Units 1 and 2 Adoption of 10 CFR 50.69 - September 6, 2018 ML18248A1022018-09-0505 September 2018 Presentation Slides - Watts Bar Nuclear Plant (WBN) Pre-Submittal Meeting for Proposed License Amendment Request Regarding Shutdown Board Cleaning - September 6, 2018 ML18248A1052018-09-0505 September 2018 Presentation Slides - Watts Bar Nuclear Plant Units 1 and 2 Adoption of TSTF-425 Initiative 5b - Surveillance Frequency Control Program - September 6, 2018 ML18248A1012018-09-0505 September 2018 09/06/2018 Bar Nuclear Plant (WBN) Pre-Submittal Meeting for Proposed License Amendment Adoption of TSTF-500 ML18164A3192018-06-18018 June 2018 Watts Bar Nuclear Plant, Units 1 and 2: Presentation Material for 6/19/18 Pre-submittal Meeting ML18024A7932018-01-25025 January 2018 Presentation Slides - Watts Bar Nuclear Plant Unit 2 Pre-Submittal Meeting for Proposed License Amendment Request Regarding the Use of PAD4TCD in the Large Break Loss of Coolant Accident Analysis ML17352B0332017-12-20020 December 2017 12/20/2017 TVA Presentation Slides - Watts Bar Nuclear Plant, Pre-Submittal Meeting for Proposed License Amendment Request Regarding 120 Vac Vital Buses NEI 09-07, Enclosure 2, Handouts and Presentations Discussed During the November 16, 2017 ROP Working Group Public Meeting2017-12-0808 December 2017 Enclosure 2, Handouts and Presentations Discussed During the November 16, 2017 ROP Working Group Public Meeting ML17340B0632017-12-0707 December 2017 TVA Presentation Slides - Watts Bar Nuclear Plant Pre-Submittal Teleconference for Proposed License Amendment Request Regarding Technical Specification 3.6.3, Containment Isolation Valves, Surveillance Requirement 3.6.3.5 - December 7, 2017 ML17320A8402017-11-16016 November 2017 Public Meeting Summary - Status of Tennessee Valley Authority'S Action to Address Chilled Work Environment at the Watts Bar Nuclear Plant ML17271A0162017-09-28028 September 2017 09/28/2017, Meeting Slide for Tennessee Valley Authority (TVA) Hydrology Precipitation Model Topical Report Review Status ML17212A8432017-08-0101 August 2017 08/01/2017, Meeting Slides for Pre-submittal Meeting with Tennessee Valley Authority on Unbalanced Voltage License Amendment Request for TVA Nuclear Plants ML16315A3942016-11-10010 November 2016 11/03/2016 Public Meeting Summary with Tennessee Valley Authority to Discuss Current Status of TVA Response Activities to NRC Letter Concerning Chilled Work Environment for Raising and Addressing Safety Concerns - Watts Bar Nuclear Plant ML16313A4662016-11-0909 November 2016 Watts Bar Nuclear Plant, Units 1 and 2 - Presentation Slides for 11/09/16 Public Meeting to Discuss Pending Submittal of Requested Change to Ice Mass TS Requirements ML16257A0202016-09-13013 September 2016 09/13/2016 Presentation Slides from Watts Bar, Unit 2, TVA Public Meeting to Discuss Tritium Production Planning ML16217A0792016-08-0404 August 2016 Presentation Regarding Proposed Extension of Technical Specification Completion Time for Inoperable Diesel Generator ML16217A0752016-08-0404 August 2016 Presentation Regarding Proposed One-Time Extension of Technical Specification Surveillance Requirements ML16102A3302016-04-0404 April 2016 Presentation Slides for 04042016 Public Meeting on Resolution of TVA Flood Model Issue ML16083A4032016-03-23023 March 2016 March 22, 2016 Summary of Public Meeting for Watts Bar ML15244B3772015-08-26026 August 2015 8/26/2015, Meeting Handout Regarding TVA Dual Unit Fire Protection Report ML15244B3832015-08-26026 August 2015 8/26/2015, Meeting Slide Regarding WBN Dual Unit Fire Protection Report Page Revision Review ML15225A3772015-08-12012 August 2015 Tennessee Valley Authority Presentation to NRC on Tpbar LAR 8-12-15 ML15205A0322015-07-27027 July 2015 Project, Operational Readiness Assessment Team Inspection Exit, Slide Presentation ML15238B8292015-07-27027 July 2015 Watts Bar 2 ORAT Exit Presentation (NRC) ML15209A8922015-07-23023 July 2015 Westinghouse Electric Co., - WCAP-10325-P-A Methodology Material Properties as Applied in the Watts Bar Containment Analysis. ML15104A2982015-04-10010 April 2015 March 26, 2015, Summary of Public Meeting with Watts Bar, Unit 2, Senior Management ML15084A4242015-03-25025 March 2015 March 17, 2015, Summary of Public Meeting with Watts Bar, Unit 1, Concerning Annual Assessment ML15125A3142015-03-18018 March 2015 3/18/2015, Meeting Slide for Reactor Oversight Process (ROP) Transition Plan for Watts Bar Unit 2 ML15125A3192015-03-18018 March 2015 3/18/2015, Meeting Slide for Tennessee Valley Authority Presentation on GDC 5 Strategy for Watts Bar Unit 2 ML15070A2092015-03-0404 March 2015 3/4/2015, Meeting Slides Regarding Public Meeting with Tennessee Valley Authority, Watts Bar, Unit 2 for Transition Plan ML15016A0422015-01-14014 January 2015 1/14/2015, Meeting Slide for Watts Bar Nuclear Plant Regarding Wrag ML14308A3052014-10-30030 October 2014 M141030: Slides - Briefing on Watts Bar Unit 2 License Application ML14295A1062014-10-22022 October 2014 October 22, 2014, Meeting Slide for Hydrology License Amendment Requests for Watts Bar Nuclear Plant ML14253A3032014-09-10010 September 2014 9/10/2014, Meeting Slide for Watts Bar Nuclear Plant, Units 1 and 2 Regarding Hydrology ML14223A4532014-08-28028 August 2014 07/22/2014 Summary of Meeting with Tennessee Valley Authority Regarding the Watts Bar Nuclear Plant, Unit 2 Operating License Application ML14231B0492014-08-19019 August 2014 TVA Handout Timeline of Safety Culture Activities August 18, 2014, Enclosure 3 ML14231A0722014-08-14014 August 2014 8/14/2014, Meeting Slide Re. National Nuclear Security Administration, Tennessee Valley Authority, and Nuclear Regulatory Commission Meeting on Watts Bar Nuclear Plant, Unit 1 Regarding 1700 G LAR ML14231A0672014-08-11011 August 2014 08/14/2014, Meeting Slide for Watts Bar Nuclear Plant, Unit 1 Tpbar Loading Increase LAR Pre-Submittal Meeting ML14182A1032014-07-0101 July 2014 July 1, 2014 NRC Slides for Public Meeting with TVA - NTTF 2.1 - Seismic Reevaluation - GMRS ML14182A0992014-07-0101 July 2014 July 1, 2014 Public Meeting Slides TVA - NTTF 2.1 - Seismic Reevaluation - GMRS ML14118A1952014-04-24024 April 2014 04/24/2014 Meeting Slide for TVA Watts Bar Nuclear Plant, Unit 2 Presentation Degraded Voltage Protection ML14108A0602014-04-17017 April 2014 Enclosure 3: Watts Bar Unit 2 - TVA Slides for Reactivation Assessment Group (Wrag) Public Meeting, April 9, 2014 ML14107A3382014-04-16016 April 2014 04/03/2014 Summary of Meeting with Tennessee Valley Authority to Discuss Nrc'S Reactor Oversight Process (ROP) and Nrc'S Annual Assessment of Plant Safety Performance for Period of January 1, 2013, to December 31, 2013 for Watts Bar Nuclear ML14101A1522014-04-11011 April 2014 03/26/2014 Summary of Public and Closed Meeting for Tennessee Valley Authority 2013 Synergy Safety Culture Survey Results ML14108A0912014-04-0909 April 2014 Enclosure 2: Watts Bar 2 Category 3 Public Meeting for 2013 Annual Assessment, NRC Slides, April 2014 ML14108A0682014-04-0909 April 2014 Enclosure 4: Watts Bar Unit 2 - NRC Slides for Public Meeting on the Operating License Application, April 9, 2014 ML14090A4582014-03-31031 March 2014 03/26/2014 - Public Meeting Summary TVA Synergy Safety Culture Survey Results 2019-01-18
[Table view] Category:Slides and Viewgraphs
MONTHYEARML19018A0072019-01-18018 January 2019 Watts Bar Nuclear Plant (WBN)Pre-Submittal Meeting for Proposed License Amendment Request Regarding a One-Time Change for the WBN Unit 2 Technical Specification (TS) 3.7.8, Essential Raw Cooling Water (ERCW) System. ML18345A3632018-12-0606 December 2018 10/18/18 Summary of Public Meeting to Discuss Status of Tennessee Valley Authority'S Action to Address Safety Conscious Work Environment at the Watts Bar Nuclear Plant ML18291A5732018-10-18018 October 2018 Watts Bar Chilled Work Environment ML18291A5632018-10-18018 October 2018 Watts Bar, Chilled Worked Environment Update ML18248A1072018-09-0505 September 2018 Presentation Slides - Watts Bar Nuclear Plant Units 1 and 2 Adoption of 10 CFR 50.69 - September 6, 2018 ML18248A1052018-09-0505 September 2018 Presentation Slides - Watts Bar Nuclear Plant Units 1 and 2 Adoption of TSTF-425 Initiative 5b - Surveillance Frequency Control Program - September 6, 2018 ML17352B0332017-12-20020 December 2017 12/20/2017 TVA Presentation Slides - Watts Bar Nuclear Plant, Pre-Submittal Meeting for Proposed License Amendment Request Regarding 120 Vac Vital Buses ML17320A8402017-11-16016 November 2017 Public Meeting Summary - Status of Tennessee Valley Authority'S Action to Address Chilled Work Environment at the Watts Bar Nuclear Plant ML17271A0162017-09-28028 September 2017 09/28/2017, Meeting Slide for Tennessee Valley Authority (TVA) Hydrology Precipitation Model Topical Report Review Status ML17265A8092017-09-26026 September 2017 09/26/2017, Meeting Slide for Watts Bar Unit 2, Tritium Production License Amendment Pre-Application Meeting ML17265A8242017-09-26026 September 2017 09/26/2017, Meeting Slide Regarding Watts Bar Unit 2, Tritium Production License Amendment Pre-Application Meeting Spent Fuel Pool Criticality Analysis ML17212A8432017-08-0101 August 2017 08/01/2017, Meeting Slides for Pre-submittal Meeting with Tennessee Valley Authority on Unbalanced Voltage License Amendment Request for TVA Nuclear Plants ML16315A3942016-11-10010 November 2016 11/03/2016 Public Meeting Summary with Tennessee Valley Authority to Discuss Current Status of TVA Response Activities to NRC Letter Concerning Chilled Work Environment for Raising and Addressing Safety Concerns - Watts Bar Nuclear Plant ML16313A4662016-11-0909 November 2016 Watts Bar Nuclear Plant, Units 1 and 2 - Presentation Slides for 11/09/16 Public Meeting to Discuss Pending Submittal of Requested Change to Ice Mass TS Requirements ML16257A0202016-09-13013 September 2016 09/13/2016 Presentation Slides from Watts Bar, Unit 2, TVA Public Meeting to Discuss Tritium Production Planning ML16217A0752016-08-0404 August 2016 Presentation Regarding Proposed One-Time Extension of Technical Specification Surveillance Requirements ML16217A0792016-08-0404 August 2016 Presentation Regarding Proposed Extension of Technical Specification Completion Time for Inoperable Diesel Generator ML16155A1592016-06-0303 June 2016 05/24/2016 - Watts Bar Public Meeting Summary ML16102A3302016-04-0404 April 2016 Presentation Slides for 04042016 Public Meeting on Resolution of TVA Flood Model Issue ML16083A4032016-03-23023 March 2016 March 22, 2016 Summary of Public Meeting for Watts Bar ML15324A4422015-11-19019 November 2015 11/19/2015, Watts Bar Nuclear Plant, Proposed License Amendment Request Diesel Generator 14-Day AOT ML15324A4432015-11-19019 November 2015 11/19/2015, Tennessee Valley Authority Presentation Ice Condenser ML15244B3832015-08-26026 August 2015 8/26/2015, Meeting Slide Regarding WBN Dual Unit Fire Protection Report Page Revision Review ML15225A3772015-08-12012 August 2015 Tennessee Valley Authority Presentation to NRC on Tpbar LAR 8-12-15 ML15205A0322015-07-27027 July 2015 Project, Operational Readiness Assessment Team Inspection Exit, Slide Presentation ML15238B8292015-07-27027 July 2015 Watts Bar 2 ORAT Exit Presentation (NRC) ML15209A8922015-07-23023 July 2015 Westinghouse Electric Co., - WCAP-10325-P-A Methodology Material Properties as Applied in the Watts Bar Containment Analysis. ML15104A2982015-04-10010 April 2015 March 26, 2015, Summary of Public Meeting with Watts Bar, Unit 2, Senior Management ML15084A4242015-03-25025 March 2015 March 17, 2015, Summary of Public Meeting with Watts Bar, Unit 1, Concerning Annual Assessment ML15125A3142015-03-18018 March 2015 3/18/2015, Meeting Slide for Reactor Oversight Process (ROP) Transition Plan for Watts Bar Unit 2 ML15125A3192015-03-18018 March 2015 3/18/2015, Meeting Slide for Tennessee Valley Authority Presentation on GDC 5 Strategy for Watts Bar Unit 2 ML15070A2092015-03-0404 March 2015 3/4/2015, Meeting Slides Regarding Public Meeting with Tennessee Valley Authority, Watts Bar, Unit 2 for Transition Plan ML15016A0422015-01-14014 January 2015 1/14/2015, Meeting Slide for Watts Bar Nuclear Plant Regarding Wrag ML14308A3052014-10-30030 October 2014 M141030: Slides - Briefing on Watts Bar Unit 2 License Application ML14295A1062014-10-22022 October 2014 October 22, 2014, Meeting Slide for Hydrology License Amendment Requests for Watts Bar Nuclear Plant ML14253A3032014-09-10010 September 2014 9/10/2014, Meeting Slide for Watts Bar Nuclear Plant, Units 1 and 2 Regarding Hydrology ML14223A4532014-08-28028 August 2014 07/22/2014 Summary of Meeting with Tennessee Valley Authority Regarding the Watts Bar Nuclear Plant, Unit 2 Operating License Application ML14231B0322014-08-19019 August 2014 TVA Meeting Slides August 18 2014, Enclosure 2 ML14231A0722014-08-14014 August 2014 8/14/2014, Meeting Slide Re. National Nuclear Security Administration, Tennessee Valley Authority, and Nuclear Regulatory Commission Meeting on Watts Bar Nuclear Plant, Unit 1 Regarding 1700 G LAR ML14231A0672014-08-11011 August 2014 08/14/2014, Meeting Slide for Watts Bar Nuclear Plant, Unit 1 Tpbar Loading Increase LAR Pre-Submittal Meeting ML14182A1032014-07-0101 July 2014 July 1, 2014 NRC Slides for Public Meeting with TVA - NTTF 2.1 - Seismic Reevaluation - GMRS ML14182A0992014-07-0101 July 2014 July 1, 2014 Public Meeting Slides TVA - NTTF 2.1 - Seismic Reevaluation - GMRS ML14118A1952014-04-24024 April 2014 04/24/2014 Meeting Slide for TVA Watts Bar Nuclear Plant, Unit 2 Presentation Degraded Voltage Protection ML14108A0602014-04-17017 April 2014 Enclosure 3: Watts Bar Unit 2 - TVA Slides for Reactivation Assessment Group (Wrag) Public Meeting, April 9, 2014 ML14101A1522014-04-11011 April 2014 03/26/2014 Summary of Public and Closed Meeting for Tennessee Valley Authority 2013 Synergy Safety Culture Survey Results ML14108A0682014-04-0909 April 2014 Enclosure 4: Watts Bar Unit 2 - NRC Slides for Public Meeting on the Operating License Application, April 9, 2014 ML14108A0912014-04-0909 April 2014 Enclosure 2: Watts Bar 2 Category 3 Public Meeting for 2013 Annual Assessment, NRC Slides, April 2014 ML14049A3412014-02-18018 February 2014 02/05/2014 Summary of Public Meeting for Watts Bar ML14015A4962014-01-0808 January 2014 01/08/2014 TVA Presentation Public Meeting on the Status of Construction and Licensing of Watts Bar Nuclear Plant, Unit 2 ML13210A4042013-07-30030 July 2013 Watts Bar Nuclear Plant, Units 1 and 2 and Sequoyah Nuclear Plant, Units 1 and 2 - Meeting Slide for 7/30-31/2013 Meeting Re. Hydrology License Amendment Requests 2019-01-18
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NearTermTaskForce Near-Term Task Force Recommendation 2.1 Seismic Hazard Evaluation EvaluationTennesseeValley Authority Tennessee Valley Authority July 1, 2014 References for Meeting*Licensee Presentation Slides -ML14182A099*NRC Presentation Slides -ML14182A103PbliMtiAd ML14167A164
- P u bli c M ee ti ng A gen d a -ML14167A164*Meeting Feedback Form (request from mfb@nrc.gov)
- May 9, 2014, NRC letter regarding Seismic Screening dPiititiRltftldtUS an d P r i or iti za ti on R esu lt s for cen t ra l an d eas t ern US Licensees(ML14111A147)*May 21, 2014, NRC memo providing preliminary staff groundmotionresponsespectraforcentraland ground motion response spectra for central and eastern Licensees(ML14136A126)*Meeting Summary to be issued within 30-day Meeting Introduction Purpose: support information exchange and begin dialog to havecommonunderstandingofthecausesoftheprimary have common understanding of the causes of the primary differences between the preliminary NRC and licensee
seismic hazard resultsBkdNRCdliiihdi B ac k groun d: NRC an d licensee se i sm i c h azar d requ i re resolution to support a final seismic screening decision and to support related follow-on submittals Outcomes: *Begin NRC and licensee resolution to support regulatory decisionsanddevelopmentofseismicriskevaluations decisions and development of seismic risk evaluations , as appropriate*Establish resolution path, including timelines and identificationofpotentialinformationneeds identification of potential information needs Look-ahead:
Potential Next Steps
- NRCwillconsiderthemeetinginformation NRC will consider the meeting information*Potential paths:
-Licenseesubmitssupplementalinformation Licensee submits supplemental information based on public meeting dialog
-NRC staff issues a re q uest for information q-Licensee sends a revision or supplement to the seismic hazard report*NRC completes screening review and issues the final screening determination ltt l e tt e r WattsBarNuclearPlant Watts Bar Nuclear Plant Rasool Anooshehpoor Office of ResearchJuly1,2014 July 1, 2014
Screening Gl G eo l ogy*The site is located in the Tennessee section of Valley andRidgeProvinceoftheAppalachianhighlands and Ridge Province of the Appalachian highlands.*In Tennessee, the Rome Formation and Conasauga, Knox and Chickamugagroups make up the majority of bdk b e d roc k.*Sedimentary rocks from Pennsylvanian to Cambrian a g e, predominant with those of Cambrian and gp Ordovician age.*Folds involving stratified Paleozoic rocks with great differencesinhardnessdifferences in hardness.*At Watts Bar the bedrock is 2000ft thick Middle Cambrian ConasaugaGroup (alternating shale and limestone) limestone)
.
Site Geology
~706 ft Control Point at 664 ft Control Point NRC Submittal SSE Control Point at elevation 664 ft.
SSE Control Point at elevation 664 ft.
V s Profile Development NRCCtilitt SubmittalShlitibd C on tinuous ve l oc it y measuremen t s at 7 boreholes in FSAR at the top 100 ftwere used to develop the V s p rofile. Shear wave ve l oc ities were b ase d on SASW and Birdwell velocity measurements (AMEC, 2013).
p V median=5704 ft/s, ln=0.134Thisisingeneralagreementwith This is in general agreement with the General Atomics (1974)
estimates.
Figure 2.5-70, FSAR (reproduced)
Shear wave velocity data from seven boreholes (FSAR)
V s Profiles Aleatory Uncertainty in V s Profiles NRC Submittal NRC30 Randomizations Using USGS "A" Site Conditions Submittal30 Randomizations Using USGS "A" Site Conditions ln= 0.25 Upper 50 ft.ln=0.15Below50ft.ln= 0.25 Upper 50 ft.ln=0.15Below50ft.ln 0.15 Below 50 ft.ln 0.15 Below 50 ft.
Epistemic Uncertainty in V s ProfilesNRCSubmittalApplied a scale factors of 1.14 to the base case profile at the Applied a scale factor of 1.25 to the base case p rofile for ptop 100 ft, and 1.31 from 100 ft to 1000 ft(Reference rock) pdevelopment of the upper and lower case profiles Watts Bar ComparisonSSE Control PointDe pth to VS-referenceNon-Linear/Dam p in g p pgLicenseeNRC StaffLicenseeNRC StaffLicenseeNRC StaffAt the base of the reactor foundationAt the base of
the reactor foundation1)592 ft 2)936 ft~1000 ftEPRI-Rock or Linear (low-strain EPRI-Linear, no damping foundation (el. 664 ft) foundation (el. 664 ft) strain EPRI Rock damping)NRCkappa,withonelayer(1000 ft)overref.rock Licensee kappa ProfilekappaBase0.0070.0100.016 Lower 0.0070.011 0.018 NRC kappa, with one layer (1000 ft) over ref. rock ProfileTotal kappa Upper500ft Balanc e P10.0120.0050.0065 Lower 0.0070.011 0.018Upper0.0060.0100.016 P20.012*1.680.0070.0144 P30.012/1.680.0040.0060 P40.0130.0050.0083 P50013*168000700168 P5 0.013*1.68 0.007 0.0168 P60.013/1.680.0040.0060Epistemic Uncertainty = 1.68
Primary DifferencesVelocity profiles:TVA used two sets of 3-velocity profiles. The reference rock depthisat592 ftinonecaseand936 ftintheother depth is at 592 ft in one case and 936 ft in the other.NRC used three velocity profiles and depth of 1000 ftto reference rock.Low strain damping: TVAused~3%dampingintheupper500ft.NRCusedkappa TVA used 3% damping in the upper 500 ft. NRC used kappa in the upper 1000ft to account for dampingTVA used a factor of 1.68 about P1 and P4 total kappasto accountforepistemicuncertainty.
account for epistemic uncertainty.
NRC calculated kappa for each of three profiles separately.
Epistemic Uncertainty in Shear Modulus and Damping Sensitivity Test Curves NRC Submittal M1EPRI Rock: 0 -500 ft M1EPRI Rock: 0 -500 ft M2 Linear &EPRI Rock Damping (~3%): 0 -500 ft M2Linear&EPRI Rock Damping (~3%): 0 -500 ftReference Rock at 1000 ftbelow control point. Reference Rock at 592 ftand 936 ftbelow control point for P1 and P4 fil Depth Randomization, ln=0.2 pro fil es.Depth Randomization, ln=0.2 Kappa and Epistemic Uncertainty NRCKappawascalculatedforeachbasecase SubmittalKappacalculatedforvelocityprofilesP1P2 Kappa was calculated for each base case profile.Kappa calculated for velocity profiles P1 , P2 , P3, P4, P5, and P6. Range of these kappas do not reflect epistemic uncertainty.
Profile kappaProfilekappa kappa (modified)
P10.0120.012 P2 0.013 0.020 (0.012 x1.68
)Profile kappa BaseCase 0.014 LBC 0.015 ()P30.011 0.007(0.012 ÷1.68)
P40.0130.013 P5 0.015 0.022(0.013 x1.68)
UBC 0.012 P6 0.012 0.008(0.013 ÷1.67)
AlifitiFti A mp lifi ca ti on F unc ti onsRock PGA = 0.3 g Comparison of Total Mean Soil Hazard by Spectral Frequency GMRS Comparison Primary Differences in Sensitivity TestVelocity profiles:TVA used two sets of 3-velocity profiles. The reference rock depthisat592 ftinonecaseand936 ftintheother depth is at 592 ft in one case and 936 ft in the other.NRC used three velocity profiles and depth of 1000 ftto reference rock.Low strain damping: BothTVAandNRCused
~3%dampingintheupper500ft.
Both TVA and NRC used 3% damping in the upper 500 ft. TVA used a factor of 1.68 about P1 and P4 total kappasto account for epistemic uncertainty. NRCcalculatedkappaforeachofthreeprofilesseparatelyNRC calculated kappa for each of three profiles separately.
Conclusions*GMRS are simila r*Watts Bar screens in for risk evaluation*Control Point hazard curves similar at 10 HzandPGA,differat1Hz Hz and PGA, differ at 1 Hz-Due to different assumptions of depth to bedrock *Need additional information to support licenseeassumptionfordepthtobedrock licensee assumption for depth to bedrock Browns Ferry Nuclear Power PlantiliIPEEE Screen ing Eva luat i on W ea kn esses i de n t ifi ed in IPEEE S ER/TEReaessesdetedS/
- Only low power injection systems selected
-Did not include hi g h pressure s ystems (HPCI/RCIC)gpy(/)-Not consistent with paths suggested in EPRI Np-6041 and other IPEEE submittals as "first line of defense" thatrespondsautomaticallythat responds automatically
-Increases demand/reliance on low pressure systems
- Automaticcircuitryfordepressurizationand
- Automatic circuitry for depressurization and initiation of low pressure injection not included
-Increases demand
/reliance on o perator actions
/p Browns Ferry Nuclear Power PlantiliIPEEE Screen ing Eva luat i on Conclusion Conclusion
- Based on weaknesses identified with the IPEEEtheIPEEEresultsarenotconsidered IPEEE , the IPEEE results are not considered adequate for screening purposesBFidiG2l*Browns Ferry is screene d i n as a Group 2 p lant