ML14182A099

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July 1, 2014 Public Meeting Slides TVA - NTTF 2.1 - Seismic Reevaluation - GMRS
ML14182A099
Person / Time
Site: Watts Bar  
Issue date: 07/01/2014
From:
Tennessee Valley Authority
To:
Office of Nuclear Reactor Regulation
Balazik M, NRR/JLD, 415-2856
References
Download: ML14182A099 (40)
v • d • e


Text

Information Exchange WBN Seismic Hazard 1

Information Exchange WBN Seismic Hazard

  • NRC May 9 Prioritization Letter

- Seismic Risk Evaluation

  • Prioritization Group 1

- WBN Acknowledges

  • Prioritization Group 1
  • Seismic risk evaluation by June 30, 2017
  • NRC May 21 Support Document

- Preliminary graphical representation

  • NRC staff GMRS differs from Licensee GMRS 2

Information Exchange WBN Seismic Hazard EPRIMaximum:

0.77g@15Hz NRCMaximum:

0.98@30Hz 3

Information Exchange WBN Seismic Hazard

  • WBNunderstandingofthecausesoftheprimary differencesbetweenthepreliminaryNRCand licenseeresults.
  • ElementsofNRCstaffpreliminaryassessment
  • FSARprimarysourceforinformationonsubsurfacematerials

- narrowervelocityprofile

>> 4,500fpslower

>> 6,500fpsupper

- Hardrockat1,000ft.

  • UseofEPRIrockcurvesandlowstraindampingvalues
  • KappaValuesandweights 4

Information Exchange WBN Seismic Hazard

  • WBNadditionaldataforsubsurfacematerials
  • Expandsitegeologicprofileduetocurrentunderstanding ofhardrockcharacteristics-shearwavevelocity>9200 fps.
  • Reduceuncertaintythroughoutprofiletobasement>

10,000ft.

  • SupportEPRIGMRSDevelopment
  • SupportDevelopmentofSeismicHazardinputforSPRA 5

Information Exchange WBN Seismic Hazard UtilizedAcademic/IndustryExpertise AMEC-ProgramManagement;regional/localgeology Dr.RobertHatcher,ProfessorofGeology,UniversityofTennessee-Knoxville Regional/localgeology Dr.KenStokoe,ProfessorofCivilEngineering,UniversityofTexas-Austin SpectraAnalysisSurfaceWave(SASW)Survey RockTesting IvanWong(URS)and SeismicHazard&EvaluationofSASW/RockTesting WaltSilva(PE&A)

SiteModeling/Characterization FacilityRiskConsultants 3rd partyseismicconsultantreview 6

Information Exchange WBN Seismic Hazard Source:AMEC(2013) 7

Information Exchange WBN Seismic Hazard 8

Information Exchange WBN Seismic Hazard 9

Information Exchange WBN Seismic Hazard 10

Information Exchange WBN Seismic Hazard

  • SASWSurvey(8testsites)

- Sites6&7profileddepthsofapprox.1400and1700

- SASWTeambelievesresultsfromSite8wouldhavebeensimilar hadsufficientlateralspacebeenavailableforalongersurvey line.

- Achievingprofiledepthsof14001700isuncommonlygood resultsforSASWsurvey!

  • RockTesting

- 6IntactRockCores(URC freefreeunconfinedresonant columntests)

- PumpkinValleyShale(2),Consauga Middle,PondSprings Formation,NolichuckyShale,andRomeFormation 11

Information Exchange WBN Seismic Hazard Source:AMEC(2013) 12

Information Exchange WBN Seismic Hazard

  • BenefitsDerivedfromSASWSurvey/RockTesting

- Providedshearwavevelocitydataforimportantgeologicformations beneaththesite

- Capturedthevariabilityinshearwavevelocitybeneaththesite

- Providedsitespecificmeasurementswhichreducedtheepistemic uncertaintyintheprofiles(1.25whereappropriate)

- Demonstratesthatassumptionsofshearwavevelocitiesfromthe typeofrockwouldhavebeenmisleading. Forexample,itwas surprisingthattheRomesandstonewasasfastasitwasandthe dolomiteslowerthanwasthought. Nosubstituteforrealdata!

- SASWmeasurementswereperformedtoadepthupto1700ftright nexttothereactor,someofthedeepestmeasurementstakeninthe centralandeasternUS.

13

Information Exchange WBN Seismic Hazard Figure2.3.21ShearwavevelocityprofilesforWattsBarNuclearPlant(EPRI,2014)

BaseCase600 LowerBound600 UpperBound592 UpperBound936 LowerBound936 BaseCase936 14

Information Exchange WBN Seismic Hazard

  • DevelopmentOfTotalEffectiveKappa

- FollowingSPIDGuidelinesForFirmRockProfile<

3,000ft Deep

- TotalEffectiveKappaBasedonFirmRockDampingof 1.25%(QS =40)

- PlusHardRockContribution0.006s

  • UncertaintyInDepthToHardRock AccommodatedWithTwoMeanDepths600ft, 900ft

- ResultsInSixKappaEstimatesForBaseCase,Upper Range,LowerRangeProfilesandTwoDepthstoHard Rock 15

Information Exchange WBN Seismic Hazard

  • EpistemicUncertaintyInBaseCaseVS ProfilesOf1.25ResultsInNarrowRangeOf Kappa

- FollowingSPIDGuidelines,EpistemicUncertainty InKappaTakenasln 0.4AboutMeanEstimate

- ShallowProfile0.012s+/-,range0.007sto0.020s

- DeepProfile0.013s+/-,range0.008sto0.022s 16

Information Exchange WBN Seismic Hazard Summary

- WattsBardevelopedasignificantlyenhancedsite geologicalprofiletosupportsitecharacterization

- SupplementedbySASWsurveytoprovideadditional clarityforstrataaboveTopofHardRock

- AccountsforvariationinthetopoftheRome FormationunderlyingWBN

- Rocktestingof6intactcorestodetermineparameters forsitecharacterization

- SitecharacterizationandEPRIGMRSperformedin conformancewithSPIDandisappropriate characterizationofseismichazardforWattsBarsite.

17

Information Exchange SQN Seismic Hazard 1

Information Exchange SQN Seismic Hazard

  • NRC May 9 Prioritization Letter

- Seismic Risk Evaluation

  • Prioritization Group 2

- SQN Acknowledges

  • Prioritization Group 2
  • Seismic risk evaluation by December 31, 2019
  • NRC May 21 Support Document

- Preliminary graphical representation

  • NRC staff GMRS differs from Licensee GMRS 2

Information Exchange SQN Seismic Hazard EPRIMaximumSA:

0.76g@20Hz NRCMaximumSA:

0.84g@40Hz 3

Information Exchange SQN Seismic Hazard

  • SQNunderstandingofthecausesoftheprimary differencesbetweenthepreliminaryNRCand licenseeresults.
  • ElementsofNRCstaffpreliminaryassessment
  • Velocityprofile
  • UseofEPRIrockcurvesandlowstraindampingvalues
  • KappaValuesandweights 4

Information Exchange SQN Seismic Hazard

  • SQNadditionaldataforsubsurfacematerials
  • Expandsitegeologicprofileduetocurrentunderstanding ofhardrockcharacteristics-shearwavevelocity>9200 fps.
  • FSARhadlimitedrockcharacteristicsdataavailableat depth(>103ft)
  • Definitionofrockprofiletobasement12,000ft.
  • SupportEPRIGMRSDevelopment 5

Information Exchange SQN Seismic Hazard

  • UtilizedAcademic/IndustryExpertise

- AMEC-ProgramManagement;regional/localgeology

- Dr.RobertHatcher,ProfessorofGeology,UniversityofTennessee

- Knoxville

>> Regional/localgeology

- Dr.KenStokoe,ProfessorofCivilEngineering,UniversityofTexas

- Austin

>> SpectraAnalysisSurfaceWave(SASW)Survey@WBN

>> RockTesting

- IvanWong(URS)

>> SiteModeling/Characterization 6

Information Exchange SQN Seismic Hazard Source:AMEC(2013) 7

Information Exchange SQN Seismic Hazard Figure2.3.21ShearwavevelocityprofilesforSequoyahNuclearPlant(EPRI,2014) 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 0

1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 Depth(ft)

Vs(ft/sec)

VsprofilesforSequoyahSite Profile1 Profile2 Profile3 BaseCase LowerBound UpperBound 8

Information Exchange SQN Seismic Hazard

  • DevelopmentofTotalEffectiveKappa
  • FollowingSPIDGuidelinesForFirmRockProfile>3,000 ft Deep

- TotalEffectiveKappaBasedonAvg.VS overTop100ft, SurfaceOutcrop

- P16,000ft/s,0.012s

- P23,821ft/s,0.020s

- P39,285ft/s,0.006sHardRock

- LikelyConservative(low),0to40ft Soil,NoWeathered Zone

  • Range0.006sto0.020sConsideredSufficient ExpressionOfEpistemicUncertainty 9

Information Exchange SQN Seismic Hazard

  • Summary

- Sequoyahdevelopedanenhancedsitegeological profile

  • Supplementedbyregionalgeologymaps,industry experts,andnearbySASWsurveys

- EPRIGMRSandsitecharacterizationperformedin conformancewithSPIDandisappropriate characterizationofseismichazardforSequoyah site.

10

Information Exchange BFN Seismic Hazard 11

Information Exchange BFN Seismic Hazard

  • NRC May 9 Prioritization Letter

- Seismic Risk Evaluation

  • Prioritization Group 2
  • NRC May 21 Support Document

- Preliminary graphical representation

  • NRC staff GMRS differs from Licensee GMRS 12

Information Exchange BFN Seismic Hazard LicenseeMaximum SA:

0.58g@25Hz NRCMaximumSA:

0.68g@40Hz 13

Information Exchange BFN Seismic Hazard

  • BFNunderstandingofthecausesoftheprimary differencesbetweenthepreliminaryNRCand licenseeresults.
  • ElementsofNRCstaffpreliminaryassessment
  • Narrowervelocityprofile

- 7,000fpslowerbound

- 9,285fpsupperbound(hardrock)

  • UseofEPRIrockcurvesandlowstraindampingvalues
  • KappaValuesandweights 14

Information Exchange BFN Seismic Hazard

  • BFNadditionaldataforsubsurfacematerials
  • Expandsitegeologicprofileduetocurrentunderstanding ofhardrockcharacteristics-shearwavevelocity>9200 fps.
  • FSARhadlimitedrockcharacteristicsdataavailableat depth(>200ft)
  • Definitionofrockprofiletobasement5,000ft.
  • SupportEPRIGMRSDevelopment 15

Information Exchange BFN Seismic Hazard

  • UtilizedAcademic/IndustryExpertise

- AMEC-ProgramManagement;regional/localgeology

- Dr.RobertHatcher,ProfessorofGeology,UniversityofTennessee

- Knoxville

>> Regional/localgeology

- Dr.KenStokoe,ProfessorofCivilEngineering,UniversityofTexas

- Austin

>> SpectraAnalysisSurfaceWave(SASW)Survey@WBN

>> RockTesting

- IvanWong(URS)

>> SiteModeling/Characterization 16

Information Exchange BFN Seismic Hazard Source:AMEC(2013) 17

Information Exchange BFN Seismic Hazard Figure2.3.21ShearwavevelocityprofilesforBrownsFerryNuclearPlant(EPRI,2014)

VsprofilesforBrownsFerrySite BaseCase LowerBound UpperBound 18

Information Exchange BFN Seismic Hazard

  • DevelopmentofTotalEffectiveKappa
  • FollowingSPIDGuidelinesForFirmRockProfile>3,000ft Deep

- TotalEffectiveKappaBasedonAvg.VsOverTop100ft,surface outcrop

- ProfilesP1,P3HardRockNearSurface,=0.006s

- ProfileP2Vs(100ft)5,914ft/s,=0.012s

- LikelyConservative(low),0to50ft Soil,NoWeatheredZone

  • Range0.006sto0.012sConsideredSufficientExpressionof EpistemicUncertainty 19

Information Exchange BFN Seismic Hazard

  • Summary

- BrownsFerrydevelopedanenhancedsite geologicalprofile

  • Supplementedbyregionalgeologymapsandindustry experts

- EPRIGMRSandsitecharacterizationperformedin conformancewithSPIDandisappropriate characterizationofseismichazardforBrowns Ferrysite.

20

BFN Seismic Risk Evaluation Screening Results 21

  • BFNunderstandstheIPEEEevaluationdidnotmeetNRC staffsexpectationforscreeningpurposes

- Prerequisite #3

- Adequacy Demonstration #3

  • BFN adequacy review acknowledged the SER identified weakness and provided justification for addressing the weakness as part of the ESEP
  • BFNhassubsequentlycompletedseismiccapacity evaluationsfortheadditionalRCICcomponents Minimum HCLPF > 0.50g

Information Exchange BFN Seismic Hazard

  • Additional information

- BFN reevaluated minimum HCLPF SSC (Auxiliary Diesel Generator Transformers)

HCLPF > 0.30g in current configuration and replacement configuration BFN commitment to complete transformer replacement by Sept 30, 2014 to resolve PCB/IPEEE screening capacity

  • TVA requests that the NRC staff reconsider the May 9, 2014 screening result that BFN screens in for seismic risk evaluation
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