ML23300A143

Kairos Power LLC, Response to Hermes 2 General Audit Question 1.5-1

ML23300A143
Person / Time
Site:	Hermes  File:Kairos Power icon.png
Issue date:	10/27/2023
From:	Kairos Power
To:	Office of Nuclear Reactor Regulation
Shared Package
ML23300A141	List: ML23300A142 ML23300A143
References
KP-NRC-2310-004
Download: ML23300A143 (1)

Text

KP-NRC-2310-004 Response to Hermes 2 General Audit Question 1.5-1 (Non-Proprietary)

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Hermes2AuditQuestionNumber:1.51 Onpage12oftheHermes1safetyevaluation(SE)(AgencywideDocumentAccessandManagement System(ADAMS)AccessionNo.ML23158A265),theNRCstaffidentifiedseveralsupplementstothe Hermes1constructionpermit(CP)applicationthatprovideadditionalinformationonthatdocket beyondthelatestversionsofthePreliminarySafetyAnalysisReportandreferencedtechnical reports.PleaseidentifywhichoftheseHermes1applicationsupplementsareapplicabletoand incorporatedbyreferenceintotheHermes2CPapplication.

KairosPowerResponse:

ThefollowingsupplementstotheHermesconstructionpermitapplication(CPA)identifiedinthe HermesSE(Reference1)areprovidedbelowwiththeirapplicabilitytotheHermes2CPA:

TransmittalofResponsestoNRCQuestions2.31and2.32ontheHermesPreliminary SafetyAnalysisReport,datedFebruary3,2022(Reference2)

ThissupplementprovidedrawmeteorologicaldataandARCON96inputandoutput filesfortheHermesReactor.Theresponsetoquestion2.32identifiedaformatting errorinthemeteorologicaldataandanerrorinthechronologicalorderthefiles werelistedinfortheARCON96run.Theseerrorswerecorrectedandtheupdated sitespecific/QvaluesweresubmittedtotheNRCbyletterdatedMarch1,2022 (Reference12).

TherawmeteorologicaldataandtheARCON96inputfilescontainedinthis supplementareapplicabletoHermes2.Theupdatedsitespecific/Qvalues submittedtotheNRCbyletterdatedMarch1,2022arealsoapplicabletoHermes2.

Thissupplementandtheupdatedsitespecific/QvaluessubmittedtotheNRCby letterdatedMarch1,2022followingcorrectionoftheerrorsidentifiedinthe supplementisapplicabletotheHermes2CPA.Nochangesarerequiredtothe Hermes2PSARbecausetheupdatedvaluesprovidedintheMarch1,2022letter havebeenincorporatedintoHermes2PSARTables13.21and13.22.

KairosPowerResponsetoNRCQuestions2.41,2.42,and2.43forPSARSection2.4on HermesConstructionPermitApplication,datedFebruary8,2022(Reference3)

ThissupplementprovideddescriptionofhowthefloodelevationshowninPSAR Table2.42wasdeveloped,statednodamsafetyupdateswereidentifiedforNorris orMeltonHilldamssince2014,andincludedthesubmissionsofflooding evaluationsreferencedintheHermesPSAR.

ThissupplementisapplicabletotheHermes2CPAwithoneclarification.Inthe responsetoquestion2.41,HermesEnvironmentalReportFigure3.42,FEMAFlood Hazards,isreferencedasprovidingthecurrentlyavailableFEMAmapthatindicates thattheestimated100yrand500yrfloodplainsremainwellbelowthesite footprint.FortheHermes2EnvironmentalReport,theFEMAFloodHazardsare providedinFigure3.21.

KairosPowerResponsetoNRCQuestions2.51,2.52,2.53,and2.54forPSARSection2.5 onHermesConstructionPermitApplication,datedFebruary9,2022(Reference4)

Thissupplementprovided:

o AresponsethatthePSARreflectsanassumptionthattheClinchRiverEarlySite Permitapplicationearthquakecatalog(endingin2013)isrepresentativeofthe seismicactivitytobeexpectedattheHermessite,

Page2of4 o Adescriptionofthemethodfordeterminingthatfoundationrockshowsnosignsof karsticdissolution, o AnewPSARFigure2.52thatincludestheMascotDolomiteshowninPSARFigure 2.51,and o AnewPSARFigure2.53showingthedipinterfaceconsistentwiththeElverton Quadrangle.

ThissupplementisapplicabletotheHermes2CPAwithoneclarification.The approximatedepthsofweatheredrock,thetopofsoundrock,andtheplanned excavationdepthfortheHermes2reactorlocationsmaybedifferentfromthe approximatedepthsspecifiedfortheHermesreactorlocation.Nochangesarerequired totheHermes2PSARbecausethechangestoFigures2.52and2.53describedinthis submittalhavealreadybeenincorporated.

KairosPowerTransmittalofReponsestoNRCRequestsforConfirmationofInformationfor HermesPreliminarySafetyAnalysisReportSection9.1,datedAugust19,2022(Reference5)

Thissupplementprovidedconfirmatoryinformationthattheapplicationforan operatinglicensewillshowtheselectedcoolantchemistrysamplinglocationstobe wellmixed,representativesamplesofthecoolant,theinertgassystemwillbe capableofmeasuringboththeairandmoisturecontentofthecovergas,the entiretyoftheinertgassystemcanbeperiodicallyleakchecked,andtheinertgas systemisnotneededtocontrolthehotcelltemperaturereferencedinthePebble HandlingandStorageSystemMalfunctionEvent.

ThissupplementisapplicabletotheHermes2CPA.

KairosPowerResponsetoNRCRequestforAdditionalInformation348and339,dated August31,2022.(Reference6)

Thissupplementprovidedresponsestorequestsforadditionalinformationfor questionsregardingtheReactorControlandShutdownSystemandthenatural circulationflowpath.

ThissupplementisapplicabletotheHermes2CPA.Nochangesarerequiredtothe Hermes2PSARbecausethePSARmarkupsincludedwiththeresponsetothisRAI havebeenincorporatedintotheHermes2PSAR.

KairosPowerResponsetoNRCRequestforAdditionalInformation350,datedSeptember1, 2022(Reference7)

Thissupplementprovidedresponsestorequestsforadditionalinformationfor questionsregardingairingress.

ThissupplementisapplicabletotheHermes2CPA.Nochangesarerequiredtothe Hermes2PSARbecausethePSARmarkupsincludedwiththeresponsetothisRAI havebeenincorporatedintotheHermes2PSAR.

KairosPowerTransmittalofResponsetoNRCQuestiononDHRSTestingfromPSARSection 6.3AuditonHermesPreliminarySafetyAnalysisReport,datedSeptember1,2022 (Reference8)

ThissupplementprovidedaresponsetoNRCauditquestionregardingDecayHeat RemovalSystemtesting.

ThissupplementisapplicabletotheHermes2CPA.

Page3of4 KairosPowerAdditionalInformationRelatedtoConstructionPermitApplication-PSAR Chapter1,datedNovember15.2022(Reference9)

ThissupplementprovidedacopyofaletterfromtheUSDepartmentofEnergyto KairosPowerregardingcontractdiscussionsforthemanagementofspentnuclear fuelandhighlevelwaste.

ThelettercontainedinthissupplementisonlyapplicabletotheHermesreactor.A separateHermes2supplementwillbeprovidedatalaterdate.

KairosPowerTransmittalofReponsestoNRCQuestiononHermesPreliminarySafety AnalysisReport,datedDecember8,2022(Reference10)

ThissupplementprovidedaresponsetoanNRCauditquestionregardingthe scheduleforcompletingresearchanddevelopmentactivitieslistedinHermesPSAR Section1.3.9.ResearchanddevelopmentactivitieslistedinPSARSection1.3.9will becompletedpriortothecompletionofconstruction.ForHermes,thelatest projecteddateforcompletionisDecember2026.

Thedateforanticipatedcompletionofconstructionprovidedinthissupplementis notapplicabletoHermes2.However,Theresearchanddevelopmentactivitieslisted inHermes2PSARSection1.3.9willbecompletedpriortothecompletionof constructionoftheHermes2facility.AsstatedinEnclosure1toletterSubmittalof thePreliminarySafetyAnalysisReportfortheHermes2KairosPowerFluorideSalt Cooled,HighTemperatureNonPowerReactor(Hermes2),Revision0,datedJuly 14,2023(Reference13),thelatestprojectedcompletiondateforthefirstunitisJuly 2027.

KairosPowerTransmittalofChangestoPreliminarySafetyAnalysisReportChapter6and ResponsetoNRCQuestiononDHRSTesting,KPNRC2212003,datedDecember19,2022 (Reference11)

ThissupplementprovidedaresponsetoafollowupNRCauditquestionon additionalDecayHeatRemovalSystemperformancephenomenatesting.

ThissupplementisapplicabletotheHermes2CPA.Nochangesarerequiredtothe Hermes2PSARbecausethePSARmarkupsincludedwiththissupplementhavebeen incorporatedintotheHermes2PSAR.

ImpactonLicensingDocument:

ThisresponsehasnoimpactonthecontentofHermes2PSAR.

References:

1. SafetyEvaluation,NuclearRegulatoryCommission,SafetyEvaluationRelatedtotheKairos PowerLLCConstructionPermitApplicationfortheHermesTestReactor,June2023 (ML23158A268)

2. Letter,KairosPowerLLCtoDocumentControlDesk,TransmittalofResponsestoNRC Questions2.31and2.32ontheHermesPreliminarySafetyAnalysisReport,February3, 2022(ML22041A337)

3. Letter,KairosPowerLLCtoDocumentControlDesk,ResponsetoNRCQuestions2.41,2.4 2,and2.43forPSARSection2.4onHermesConstructionPermitApplication,February8, 2022(ML22040A141)

4. Letter,KairosPowerLLCtoDocumentControlDesk,ResponsetoNRCQuestions2.51,2.5 2,2.53,and2.54forPSARSection2.5onHermesConstructionPermitApplication, February9,2022(ML22040A336)

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5. Letter,KairosPowerLLCtoDocumentControlDesk,TransmittalofReponsestoNRC RequestsforConfirmationofInformationHermesPreliminarySafetyAnalysisReport, Section9.1,August19,2022(ML22231B228)

6. Letter,KairosPowerLLCtoDocumentControlDesk,ResponsetoNRCRequestfor AdditionalInformation348and339,August31,2022(ML22243A247)

7. Letter,KairosPowerLLCtoDocumentControlDesk,ResponsetoNRCRequestfor AdditionalInformation350,September1,2022(ML22252A149)

8. Letter,KairosPowerLLCtoDocumentControlDesk,TransmittalofResponsetoNRC QuestiononDHRSTestingfromPSARSection6.3AuditonHermesPreliminarySafety AnalysisReport,September1,2022(ML22244A235)

9. Letter,KairosPowerLLCtoDocumentControlDesk,AdditionalInformationRelatedto ConstructionPermitApplication-PSARChapter1,November15,2022(ML23019A360)

10. Letter,KairosPowerLLCtoDocumentControlDesk,TransmittalofReponsestoNRC QuestiononHermesPreliminarySafetyAnalysisReport,December8,2022(ML22342B282)

11. Letter,KairosPowerLLCtoDocumentControlDesk,TransmittalofChangestoPreliminary SafetyAnalysisReportChapter6andResponsetoNRCQuestiononDHRSTesting, December19,2022(ML22353A625)

12. Letter,KairosPowerLLCtoDocumentControlDesk,TransmittalofChangestoMaximum HypotheticalAccidentDoseResultsinHermesConstructionPermitApplication,March1, 2022(ML22060A272)

13. Letter,KairosPowerLLCtoDocumentControlDesk,SubmittalofthePreliminarySafety AnalysisReportfortheHermes2KairosPowerFluorideSaltCooled,HighTemperatureNon PowerReactor(Hermes2),Revision0,July14,2023(ML23195A122)