ML22040A338

Kairos Power LLC, Response to NRC Questions 2.5-1, 2.5-2, 2.5-3, and 2.5-4 for PSAR Section 2.5 on Hermes Construction Permit Application

ML22040A338
Person / Time
Site:	Hermes File:Kairos Power icon.png
Issue date:	02/09/2022
From:	Kairos Power
To:	Office of Nuclear Reactor Regulation
Shared Package
ML22040A336	List: ML22040A337 ML22040A338
References
KP-NRC-2202-002
Download: ML22040A338 (7)

Text

Enclosure 1 Kairos Power Response to NRC Questions 2.5-1, 2.5-2, 2.5-3, and 2.5-4 (Non-Proprietary)

Page1of1

QuestionNumber:2.51

Section2.5.3oftheapplicationreliesontheinformationofClinchRiverEarlySitePermit applicationsearthquakecatalog,whichendsin2013.Anupdated(20132021)earthquake catalogshouldbeprovidedtodemonstratethattheassumptionsandconclusionsinthe CRNPSHAremainvalid.

KairosPowerResponse:

ThepossiblechangesinearthquakeactivityintheHermes,andClinchRiverNuclear(CRN),

siteregionduringthe20132021periodrelativetotheCRNrateshavenotyetbeen finalized.ThePSARreflectsanassumptionthattheClinchRiverEarlySitePermitapplication earthquakecatalogisrepresentativeoftheseismicactivitytobeexpectedattheHermes site,basedonproximitytoCRNandthefactthatrecentseismicactivityintheCentraland EasternUnitedStates(CEUS)sincethe2012MineralVirginiaearthquakeeventhasnotbeen significant.

KairosPowerisnotrequestingfinalapprovalofaseismichazarddesignprofileforHermes aspartofthePSAR.Theinformationprovidedissufficienttodeterminesuitablyofthesite fortheproposeduseofatestreactor.TheHermesOperatingLicenseApplicationwill reporttheseismichazardwithupdatedearthquakecatalogrecurrencerates.

ImpactonLicensingDocument:

ThisresponsehasnoimpactonthecontentofPSARSection2.5.

References:

None

({J Kairos Power

Page1of1

QuestionNumber:2.52

ForSection2.5.4.3,howdoesKairosintendtodeterminethatthefoundationrockshowsno evidenceofkarsticdissolution?

KairosPowerResponse:

BoringdataclosesttotheproposedHermesreactorlocationindicatesthetopofthe weatheredrockisencounteredatadepthofapproximately13.5ft.,andthetopofsound rockatadepthofapproximately30ft.Theoverburdensoilsandtheweatheredrockwillbe excavated.Belowtheweatheredrock,soundbedrockrecoveredfromtheboringsdrilled showsnoevidenceoftheweakeningorweatheringthatisobservedintheinterfacecloser tothesurface.TheHermesfoundationwillbedeployedoveranengineeredcrushedstone orleanconcretefillplaceddirectlyoversoundrock.Theexcavationisplannedtoreachthe approximately30ftdepth,exposingthesurfaceofthefoundationrocktoallowfor inspectionandsurfacepreparation.Theseactivities,boringdataandfoundationrock inspectionfollowingexcavation,willallowthedeterminationtobemadethatthe foundationrockshowsnoevidenceofkarsticdissolution.

ImpactonLicensingDocument:

ThisresponsehasnoimpactonthecontentofPSARSection2.5.

References:

None

({J Kairos Power

Page1of2

QuestionNumber:2.53

GeologiccrosssectionAA(Figure2.52)appearstobemissingtheMascotDolomite,which isshownonthemap(Figure2.51)butnotinthecrosssection.Provideanewcrosssection thatincludesallgeologicunitsshownonthesurfaceandencounteredinthesubsurface.

KairosPowerResponse:

Figure2.52hasbeenupdatedtoaddtheMascotDolomite,consistentwithFigure2.51.

Locationofinterfacesanddipsareindicatedasapproximate.

ImpactonLicensingDocument:

ThePSARSection2.5Figure2.52,SubsurfaceProfileAAhasbeendeletedandreplacedby theupdatedFigure2.52(attached).Thischangewillbeincludedinafuturerevisiontothe PSAR.

References:

None

({J Kairos Power

Page2of2

UPDATEDFIGURE2.52SubsurfaceProfileAA

ELEV [ft]

780 770 760 750 740 730 720 710 FILL Fat clay w/rock fragments Stiff to very Stiff N=10 to 20 RESIDIUUM CLAY Fat Clay Very Soft N = 2 to 5 CLAY FILL

~

CLAY FILL & GRAVEL LIMESTONE

~

DOLOMITIC LIMESTONE

~

RESIDIUM CLAY ALLUVIAL CLAY RESIDIUM ROCK lfil WEATHERED LIMESTONE PROFILE A-A' RESIDIUUM ROCK Weathered Limestone Fragments LIMESTONE Light Olive Gray

=

CT WEATHERED LIMESTONE o'<"'

GEOLOGIC BOUNDARY

\\

- Ops: Pond Springs Formation

- Om: Murfreesboro Limestone

- Oma: Mascot Dolomite o"'

go

- Unit interfaces and dips shown are approximate (Tennessee Geological Survey, 2015)

-~- GROUNDWATER TABLE (Approximate)

SURFACE SOILS Om p-,

B-5 Limestone Light Gray I

0 50' 200'

[HORIZONTAL ]

p-,

I 0

20' 50'

[VERTICAL]

Information between borings is assumed and actual conditions may vary

Page1of2

QuestionNumber2.54

GeologiccrosssectionBB(Figure2.53)showstheMascotDolomiteappearingtodipto thenorthwest.However,geologicmapsofthesiteshowallunitsatthesitelocationdipping tothesoutheast(seeGeologicMapoftheElvertonQuadrangle,TennesseeGeological Survey,2015).PleaseconfirmthecorrectdipdirectionoftheMascotDolomiteandprovide anewcrosssectionthatshowsthecorrectdipifneeded.

KairosPowerResponse:

AnupdatetoFigure2.53isprovidedshowingthedipoftheinterfaceconsistentwiththe ElvertonQuadrangle(Reference1).Figure2.53hasbeenupdatedtobeconsistentwith Figure2.51andtheReference1geologicmap.Thelocationofinterfacesanddipsare indicatedasapproximateandconsistentwithReference1.

ImpactonLicensingDocument:

ThePSARSection2.5Figure2.53,SubsurfaceProfileBBhasbeendeletedandreplacedby theupdatedFigure2.53(attached).Thischangewillbeincludedinafuturerevisiontothe PSAR.

References:

1.

PSARSection2.5.6Reference4,Limiszki,P.,"GeologicMapoftheElvertonQuadrangle, Tennessee,"TennesseeGeologicSurvey.2015.

({J Kairos Power

Page2of2

UPDATEDFIGURE2.53SubsurfaceProfileBB

ELEV [ ft]

780 770 760 750 740 730 720 710 700 690 RESIOIUU M CLAY Fat Clay Very Soft N=2to5 Ill CLAY FILL

~

CLAY FILL & GRAVEL Ill LIMESTONE

~

DOLOMITIC LIMESTONE

~

RESIDIUM CLAY Ill ALLUVIAL CLAY RESIDIUM ROCK LJ WEATHERED LIMESTONE PROFILE B-B' Oma DOLOMITE light Olive Gray R"'

GEOLOGIC BOUNDARY o \\

- Ops: Pond Springs Formation o"'

- Om: Murfreesboro Limestone

- Oma: Mascot Dolomite

- Unit interfaces and dips shown are approximate (Tennessee Geological Survey, 2015)

-*- GROUNDWATER TABLE (Approximate)

Ops LIMESTONE Light Olive Gray

{assumed) 0 50' 200'

[ HORIZONTAL]

0 20' 50'

[VERTICAL ]

Information between borings is assumed and actual conditions may vary