ML22187A270

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International, HI-STORM 100 Amendment 18 Rsi Clarification Meeting
ML22187A270
Person / Time
Site: Holtec
Issue date: 07/06/2022
From:
Holtec
To:
Document Control Desk, Office of Nuclear Material Safety and Safeguards
Shared Package
ML22187A268 List:
References
5014947
Download: ML22187A270 (11)


Text

www.holtec.com HI-STORM 100 Amendment 18 RSI Clarification Meeting ATTACHMENT 1 TO HOLTEC LETTER 5014847 1 of 11

www.holtec.comlPage2 RSI 4-1 RSIasksformoredescriptionabouttheflowchartaddedinFigure 1.0.1oftheSARandspecificallyaboutthelimitationsintheSEforthe topicalreport HoltecunderstandsthatthetopicalreporthasSElimitations,but wantedtofindawaytonotsupersedethe10CFR72.48regulation whichappliestotheFSAR Holtechasaproposaltomodify,suchthatthefinalqualificationofany heatloadpatternisperformedusingtheinvarianttopicalreport model Previouslytheplanwastoshowthatthe72.48modelwasbounded bythetopicalreportmodel,andusethe72.48modelfor qualificationofheatloadpatterns Revisedproposedapproachwillshowthe72.48modelisbounded bythetopicalreportmodelandusethetopicalreportmodeltodothe finalqualificationoftheheatloadpatterns ATTACHMENT 1 TO HOLTEC LETTER 5014847 2 of 11

www.holtec.comlPage3 RSI 4-1 Step1-SitedecidestheexistingCoCheatloadpatterns donotmeettheirneeds,anddevelopsanewpattern thatwouldmeetfuelloadingneeds Step2-Site/Holtecdetermineifthesystembeing usedmatchestheinvariantmodelinthetopicalreport Ifyes,thenproceedthroughthequalificationprocess outlinedinthetopicalreport,ensureallTopicalReport acceptancecriteriaaremet,andrejoinatStep3 Ifno,followSteps2athrough2d NOTE-thesystembeingusedmuststillfallunderonethose listedintheTopicalReportSE,justmayhavesomevariation withinthosemodels ATTACHMENT 1 TO HOLTEC LETTER 5014847 3 of 11

www.holtec.comlPage4 RAI 4-1 Step2a-Ensurethatthevariationsfromthetopicalreport invariantmodel(identifiedinStep2)areacceptablewithout NRCapprovalundertheexistingCoC/FSAR ThisprocessisidenticaltoHoltecsexisting72.48programand shouldbedocumentedaccordingly,whichdevelopsa72.48 modelforthatvariation Ifnotacceptable,submittoNRCforapproval Step2b-Oncethevariationshavebeendetermined acceptableunder72.48,thesitescandidateheatloadpattern shouldbeevaluatedinthe72.48model Thiscalculationmustshowthatallcomponentshavealower temperaturethantheFSARlimitsandpressureslowerthanthe FSARlimits ThePCTfromthisanalysisisthencomparedtoStep2c ATTACHMENT 1 TO HOLTEC LETTER 5014847 4 of 11

www.holtec.comlPage5 RSI 4-1 Step2c-Thecandidateheatloadpatternisthenfully qualifiedforusebyevaluationintheTopicalReportinvariant model ThisevaluationmustshowALLTopicalReportacceptancecriteria aremet ThisevaluationmustshowahigherPCTthanStep2b Ifeitheroftheseconditionsisnotmetthecandidateheatload patternmustberevised Step2d-ThetemperatureresultsfromSteps2band2care comparedtothestructuralevaluationsintheFSAR IfFSARstructuralevaluationsusetemperaturesthatboundthe calculatedtemperatures,nofurtheraction IfFSARstructuralevaluationsusetemperaturesthatdoNOT boundthecalculatedtemperatures,anadditional72.48mustbe performedtodemonstratethenewtemperaturesareacceptable withoutNRCapproval ATTACHMENT 1 TO HOLTEC LETTER 5014847 5 of 11

www.holtec.comlPage6 RSI 4-1 Step3-OncealltheitemsandacceptancecriteriainStep2a through2daresatisfied-documenttheevaluationperformedin Step2c(candidateheatloadpatternininvariantmodel)insites qualificationreport Note,otherevaluationswillbedocumented,butofficialqualification andcomparisonwithtopicalreportacceptancecriteriaareperthe invariantmodel Thiswillbeanindividualreportforeachsiteandpossiblymorethanone reportforeachsite,soitseemsmoreappropriatetobereferencedin the72.212insteadoftheCoC Step4-Sitechoosesfueltomeetthequalifiedheatloadpattern, confirmingthatthefuelalsomeetsotherCoCrestrictions,suchas (butnotlimitedto)fueltypesandFQTs Step5-Siteensuresloadingprocedureshavetheaccurate restrictions(suchasheliumbackfillandventtemperature monitoringrequirements)basedonthetopicalreportmethodology ATTACHMENT 1 TO HOLTEC LETTER 5014847 6 of 11

www.holtec.comlPage7 RSI 4-1 Step1-Site developscandidate heatloadpattern Step2-doesthe systembeingused atsitematchthe TRinvariantmodel Step3 Evaluatethe candidateheatloadpattern underthetopicalreport methodologyanddocument inqualificationreport,with alllimitations(backfill,etc.)

Yes No Step2a-Ensurethatthe variationsidentifiedin Step2areacceptable undertheexisting CoC/FSARunder72.48,if notprocessstops Step2b-Usethemodel developedforthe72.48to evaluatethesitescandidate heatloadpattern-acceptancecriteriaare temperaturesandpressures lowerthanFSARlimit,AND PCTlowerthanStep2c Step2c-Usethetopical reporttoevaluatethesites candidateheatloadpattern

- acceptancecriteriaareas outlinedinthetopical report,andPCTmustbe higherthanStep2b Step2d-comparethe boundingtemperaturesof eachcomponentfrom2band 2ctothoseusedintheFSAR structuralanalysis,andupdate structuralanalysisifneeded/

permittedunder72.48 Step4-Sitechoosesfuelto meetthequalifiedheatload patternconfirmingthatthefuel alsomeetsotherCoC restrictions,suchasFQT Step5-Siteensuresloading procedureshavetheaccurate restrictionsbasedonthe topicalreportmethodology ATTACHMENT 1 TO HOLTEC LETTER 5014847 7 of 11

www.holtec.comlPage8 Shielding RSIs 61 DonotintendtoapplytopicalreporttoUVH,willupdateCoCforclarity AsksaboutlanguageonFSARpage51aboutessentiallyidentical Thatlanguagewasnotmodifiedinthisamendment ThelanguageremainsunchangedsinceFSARRev1in2003 AsksaboutBECTs,Section1.0.3.1oftheproposedamendmentexplains thattheexistingBECTsapplyevenwithnewheatloadpatterns developed-thisisechoedintheproposedCoC,AppB,Section2.4.3 Asksabouttheshieldinganalysisforthe100UVH,whichisunderreview aspartofAmendment16,theMLnumberisnotpubliclyavailable,but appearstobefortheAmendment16submittal 62 Asksabouttheshieldinganalysisforthe100UVH,whichisunderreview aspartofAmendment16 Amendment18didnotincludeanypatternswithdifferentzonesor modificationstoTable2.1.30towhichtheRSIrefers ATTACHMENT 1 TO HOLTEC LETTER 5014847 8 of 11

www.holtec.comlPage9 Shielding RSIs/ Observations 63 AsksaboutcomparisonofdoseratesbetweendifferentMPCsinthe100SVersionB ThereferencedMLnumberisforthebiennialFSARsubmittal,nottheAmendment18 package NochangesweremadetothissectioninAmd18,itappearsunchangedsinceFSARRev7 in2008,andrelatedevaluationswerediscussedintheSERforAmd5 ObsSh1 AsksaboutCoCheatloadpatternsvsshieldinganalysisofHISTORM100UVH ThereferencedMLisnotpubliclyavailable,butitappearstobethecalcpackage submittedwithAmd16,wheretheUVHwasintroduced NodecayheatloadpatternsintheCoChavebeenmodifiedinAmd18 ObsSh2 AsksaboutstatementsinFSARChapter5relatedtoBPRAs ReferencedMListheHISTORM100biennialsubmittal,notasectionimpactedbyAmd18 ReferencedstatementsareunchangedsinceFSARRev13in2016,andevaluationsare describedasacceptableintheSERforAmd8Rev1 ATTACHMENT 1 TO HOLTEC LETTER 5014847 9 of 11

www.holtec.comlPage10 Shielding Observations ObsSh3 Asksaboutdemonstratingthatshieldingcalculationsarereliable NoshieldingcalculationsweresubmittedwithAmd18.We wouldlikesomeclarificationontheintendedscopeofthis observation ObsSh4 AsksaboutdistancefromISFSItocontrolledareaboundary ReferstotheHISTORM100UVHshieldinganalysis,whichwas submittedinAmd16andstatementsintheFSARbiennial submittalthatareunchangedwiththisAmd18 ATTACHMENT 1 TO HOLTEC LETTER 5014847 10 of 11

www.holtec.comlPage11 Path Forward Basedonoutcomeofthismeeting,Holtecwillnotify theNRCstaffofaplannedscheduleforformal responsestotheRSIs ATTACHMENT 1 TO HOLTEC LETTER 5014847 11 of 11