ML20257A013

COL Docs - FW: Follow Up on Updated FLEX OIP Conference Call

ML20257A013
Person / Time
Site:	Vogtle
Issue date:	09/13/2020
From:	NRC
To:	NRC/NRR/DNRL
References
Download: ML20257A013 (9)

Text

From:

Patel, Chandu Sent:

Sunday, September 13, 2020 6:57 PM To:

Vogtle PEmails Cc:

Patel, Chandu

Subject:

FW: RE: Follow up on Updated FLEX OIP Conference Call Attachments:

Responses to questions during July 28 Conference Call on FLEX OIP NP.pdf From: Kellenberger, Nicholas <X2NRKELL@SOUTHERNCO.COM>

Sent: Thursday, September 03, 2020 3:40 PM To: Patel, Chandu <Chandu.Patel@nrc.gov>

Subject:

[External_Sender] RE: Follow up on Updated FLEX OIP Conference Call Hi Chandu, We did a review and identified one part of the information provided that was taken from the proprietary section of the OIP submittal. That was in the discussion on RAI 02-02. Weve updated the file to remove the proprietary information so it should be able to be placed into ADAMs.

Thanks for checking with us first.

Thanks, Nick Kellenberger Site Licensing Supervisor Vogtle 3 and 4 phone: (706) 437-2333 mobile: (803) 391-9671 From: Patel, Chandu <Chandu.Patel@nrc.gov>

Sent: Tuesday, September 1, 2020 6:36 PM To: Kellenberger, Nicholas <X2NRKELL@SOUTHERNCO.COM>

Subject:

RE: Follow up on Updated FLEX OIP Conference Call EXTERNAL MAIL: Caution Opening Links or Files Hi Nick, Is there any objection if we put this in ADAMS? Is there any proprietary information in this?

Please let me know if you have any reservations for putting in ADAMS.

Thanks, Chandu From: Kellenberger, Nicholas <X2NRKELL@SOUTHERNCO.COM>

Sent: Tuesday, September 01, 2020 4:24 PM

To: Patel, Chandu <Chandu.Patel@nrc.gov>

Cc: Stacy, Kara M. <KMSTACY@southernco.com>; Spaulding, Douglas F.

<X2DFSPAU@SOUTHERNCO.COM>

Subject:

[External_Sender] Follow up on Updated FLEX OIP Conference Call

Chandu, Sorry I didnt get to your call earlier today. Attached are the follow up items from our 7/28 conference call. Please let us know if you have any further questions.

Thanks, Nick Kellenberger Site Licensing Supervisor Vogtle 3 and 4 phone: (706) 437-2333 mobile: (803) 391-9671

Hearing Identifier:

Vogtle_COL_Docs_Public Email Number:

588 Mail Envelope Properties (SA9PR09MB5997F12071A5A7968E52FBDB82220)

Subject:

FW: RE: Follow up on Updated FLEX OIP Conference Call Sent Date:

9/13/2020 6:56:34 PM Received Date:

9/13/2020 6:56:38 PM From:

Patel, Chandu Created By:

Chandu.Patel@nrc.gov Recipients:

"Patel, Chandu" <Chandu.Patel@nrc.gov>

Tracking Status: None "Vogtle PEmails" <Vogtle.PEmails@nrc.gov>

Tracking Status: None Post Office:

SA9PR09MB5997.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 2078 9/13/2020 6:56:38 PM Responses to questions during July 28 Conference Call on FLEX OIP NP.pdf 186932 Options Priority:

Normal Return Notification:

No Reply Requested:

No Sensitivity:

Normal Expiration Date:

1.

NRCrequestedinformationonthepost72hoursequipmentstoredatSAFER.



Response:



VEGP3&4OffsiteEquipment

Descriptionof

PortableEquipment

PerformanceCriteria

Notes

PCS/SFPMakeup

Pump

135gpmat236ft.developedheadand100gpmat

273ft.developedhead.



PumptakessuctionfromPCCAWSTtoyardsafety relatedflangeconnectionforsupportofpassive

coolingandspentfuelpoolmakeup.

Oneportabletrailermounteddiesel drivenpumpperunit.Plus,thereis

onesparepump.



PCCAWSTMakeup

Pump

300gpmpressureratingRGT300psiwithminimum

26ft.suctionlift.



UsedforindefinitemakeuptothePCCAWSTby

pumpingwaterfromtheSavannahRiver.The

pumpdischargeisdirecteddirectlyintothetopof

PCCAWST.

Oneportabletrailermounteddiesel drivenpumpthatiscapableof

providingadequateflowtobothunits

simultaneously.Plus,thereisone

sparepump

PortableGenerators

480V,150KW,0.8PF,3PhaseWYE,plusNeutral

andGround,CapableofParallelOperation,

VoltageVariance+/5%,FrequencyVariance+/

0.25%

Onetrailermounteddieseldriven

portablegeneratorperunit.Plus

thereisonesparegenerator

Ventilation

Fans/Hose

1hp,1700cfm,Fan,with300ftdetachablehose,

electricrating:singlephase115VAC.



ReplacesAncillary:OnefanisforMCR

whichrequires1700cfm@0.65in.ofwater.



TwofansforI&Croomswhichrequires1500

cfm@0.71inchesofwater.

Sevensets,3perunitplusonespare.



VentilationDuct

AntiStatic,16diameterin25ftlengths

16lengths,8lengthsperunit.

FireHose

5inchdoublejacket,300psiservicepressurehose

in50ftlengths.



Totalof220lengthsin

supportofallpumpsfor

bothunits.



TemporaryCabling/

Adapters

Powercable600V,1/C,4/0AWG,in100ft

lengths



PowercableSuperTRX2/3CPPAcable,in50ft.

lengths

Total4000ft.of4/0AWGforeach

conductor(2000ft.foreachunit)

Total1600ft.0fTRXcable(800ft

eachunit)











2. NRCrequestedthestatusofpreviousRAIssubmittedin2014and2015?



x NRCaskedifUnit3canstillconnectthetwoFLEXpumpsinseriestocoverthecontainment?



TheUpdatedFLEXOIP,Section2.9.2.1and2.9.2.2,donotcreditthatalignmentforastrategy.



Section2.9.2.1PrimaryStrategy,states:

Forindefinitecopingafter7days,Phase3equipmentincludesaselfpoweredpump(PCCAWSTmakeup

pump)andappropriateconnectionmaterialstorefillthePCCAWSTfromtheSavannahRiver.



Section2.9.2.2,AlternateStrategy(modifiedfromoriginal),states:

In the unlikely event that both PCS recirculation pumps are unavailable, the selfpowered PCS

recirculationpumpequivalent,willtakesuctionfromthePCCAWSTviatheconnectionaddedtothe

overflow/drainline(Reference66).Insteadoftheportablepumpsupplycomingfromtheclosest,river,

lake,oroceansource,anddischargingtoasafetyrelated,seismicallyqualifiedflange(References48

and49)usingfirehose,aseparatePCCAWSTmakeuppumpwilldrawwaterfromtheSavannahRiver

andprovidemakeuptothePCCAWST.ThisallowsmakeuptotheSFPandthepassivecontainment

coolingwaterstoragetank(PCCWST)ashighlightedonFigure2ofReference2.Theminimumrequired

headandmaximumpumpdischargeheadforthePCSrecirculationpumpequivalentisdocumentedin

Table31Section11ofReference18.TheSAFERpumpswillmeetthesecriteria.



x NRCaskedwhatistheprimarysourceofwaterfortheFLEXstrategy?



TheSavannahRiveristhecreditedwatersource.However,thereareseveralcleanersourcesofwater

thatwouldbeconsideredpriortopumpingriverwaterintotheplant.



x NRCaskedifnotreferencingtheRAIresponsesintheUpdatedFLEXOIPwasanoversightorintentionally

donetonolongerfollowthem?



Duringthecallwestateditwaslikelyanoversight,andstatedwewouldtakeanotherpassthroughthe

RAIresponsesandcommunicatethecontinuedvalidityorpointtotheupdated/changedinformation

providedintheupdatedFLEXOIP.



Overall,theRAIresponsesarestillvalidwithsomeexceptionasprovidedbelow:



RAI012statesinpart:

TheonlyportableoffsitevalverequiredisthePCS/SFPmakeuppumpdischargethrottlingvalvewhichisincluded

aspartofthepumpskid.Thisvalvewillhavemanualthrottlingcapabilitywhichwillbeguidedbyaflowmeter

alsocontainedwithinthepumpskid.Itwillbemaintainedalongwiththepumpasdescribedintheresponseto

RAI011.



IdentifieddifferencewiththeRAIresponse:

Thereisnodischargethrottlingvalveonthepumpskid.Thepumpisavariablespeedpumpwhichcancontrol

theflowrateandactlikeathrottlingvalve.Therewillbeaportableflowmeterprovidedinthepumpdischarge

hosetomonitorpumpflow.



RAI0103statesinpart:

ThePCCAWSTmakeuppumpisdeterminedtohavearequiredflowrateof150gpm.



IdentifieddifferencewiththeRAIresponse:

ThePCCAWSTmakeuppumpissizedtosupportbothUnits3&4simultaneously.Itsuppliesatotalminimumof

300gpm(150gpmperunit).



UpdatedOIPSection2.19.6,N+1EquipmentRequirement,states:

N+1willbeprocuredforasingleresponsecenter.ConsistentwithNEI1206,Section3.2.2.16,3piecesof

portableequipmentwillbeprovidedwhenaseparatetrainisneededforeachunit(portablegeneratorand

PCCWSTMakeupPump)andtwopieceswillbeprovidedwhenasingletraincansupplybothunits(ultimate

makeupfromtheSavannahRiver,thecreditedsourceforVEGPUnits3and4).Thisequipmentwillbestoredat

theregionalresponsecenterinPhoenix,AZ.



TheultimatemakeuppumpfromtheriveristhePCCAWSTMakeupPumpwhichiscapableofsupplyingboth

units.



Thisisnotconsideredachangetothecompliancemethodasthepumpsareequivalenttothepreviouslyspecified

pumpsandcontinuetomeettheN+1concept.



RAI0202statesinpart:

AsdiscussedinAPPGWGLR170,theprimarystrategyfortheoffsitereplacementgeneratorsistoreplacethe

permanentlyinstalledancillarydieselgenerators.Therefore,thesamenominalgeneratorratingisselectedfor

theoffsitereplacementgeneratorsasforthepermanentlyinstalledancillarydieselgenerators(80kW,480V).

The alternate strategy, as described in APPGWGLR170 Section 9b, requires less power than the primary

strategybecausethePCSrecirculationpumps,andtheoffsiteportablepumpswouldnotbepoweredfromthe

offsiteportablegeneratorinthisalternateconfiguration.Therefore,thenominalratingof80kW/480Vis

consideredboundingfortheprimaryandalternateFLEXstrategies.



IdentifieddifferencewiththeRAIresponse:

Theoffsitereplacementgeneratorbeingprovidedforeachunitisa150kW/480Vdieseldrivengenerator.



ThisgeneratorisdiscussedinUpdatedOIPSection2.11.2.2,AlternateStrategy.



Thisisnotconsideredachangetothecompliancemethodasthegeneratorsprovidedarelarger,notdifferent.



RAI0204statesinpart:

TheAP1000post72hourproceduresspecifytheuseofpermanentlyinstallednonsafetyequipmentastheinitial

strategyforbothPCSandSFPmakeupasdescribedinAPPGWGLR170.ForthealternatestrategyforFLEX,only

portableequipmentisused.Thisportableequipmentishookeduptosafetyrelatedconnectionpointsandstored

asufficientdistancefromthesitesuchthatitwouldnotreasonablybesubjecttothesamehazardatthesite.

SincethealternateFLEXstrategiesonlyusesafetyrelatedpermanentlyinstalledconnectionpointsandportable

equipment that are expected to survive all hazards, justification that the permanently installed nonsafety

equipmentfortheinitial(primary)strategysurvivesanyhazardisnotrequired.

IdentifieddifferencewiththeRAIresponse:

Theportableequipmentishookeduptoprotectedconnectionpointsthatareeithersafetyrelatedordesigned

tobehazardrobust.

TosupportjustifyingthepermanentlyinstallednonsafetyrelatedequipmenttheUpdatedOIPsection2.9.2.2,

states:

ThePCSrecirculationpumps,theonsiteancillarydieselgenerators,andthePCCAWSTarenonsafetyrelated

components.However,thesecomponentsareruggedcomponentslocatedinnuclearseismicstructureswith

seismiccategoryIIanchorageandarelikelytobeavailableoreasilyrepairablefollowingabeyonddesignbasis

event.ThePCSrecirculationpumpsarelocatedintheseismiccategoryIauxiliarybuilding.Theonsiteancillary

dieselgeneratorsarelocatedintheseismiccategoryIIannexbuilding.ThePCCAWSTisaseismiccategoryIItank

intheyard.



Thisisnotconsideredachangetothecompliancemethodasalltheplantconnectionsareconsideredprotected

anddesignedtobesurvivable(hazardrobust).



RAI0206statesinpart:



Therefore, both the PCS recirculation pumps and the PCS/SFP offsite portable makeup pump require an

envelopingdesignflowrateof135gpm.ThePCCAWSTmakeuppumpisdeterminedtohavearequiredflowrate

of150gpm.



IdentifieddifferencewiththeRAIresponse:



ThePCCAWSTmakeuppumpissizedtosupportbothUnits3&4simultaneously.Itsuppliesatotalminimumof

300gpm(150gpmperunit).SeetheresponsetoRAI0103above.



Thisisnotconsideredachangetothecompliancemethodasthepumpsareequivalenttothepreviouslyspecified

pumpsandcontinuetomeettheN+1concept.



RAI0210statesinpart:



AlternatestrategyIntheeventthatthePCSrecirculationpumpsareunavailable,Phase3equipmentforthe

AP1000designincludesasecondselfpoweredoffsitepump(PCS/SFPmakeuppump)andappropriateconnection

materials[that]allowsmakeuptotheSFPandthepassivecontainmentcoolingwaterstoragetank(PCCWST)as

highlightedonFigure2.[]Supplytotheselfpoweredpumpwillcomefromtheclosestriver,lake,orocean

source.



AdditionalDiscussion:Forthealternatestrategy,thePCS/SFPmakeuppumpisusedinserieswiththePCCAWST

makeuppump,eitherdirectlyinseriesorindirectly(ifthePCCAWSTisstillavailable).ThePCCAWSTmakeup

pumpissizedappropriatelytodeliverwaterfromtheclosestriver,lake,oroceansource;regardlessofwhether

thedestinationisthePCCAWSTorthesuctionofthePCS/SFPmakeuppump.



IdentifieddifferencewiththeRAIresponse:

UpdatedOIPSection2.9.2.2,AlternateStrategy(modifiedfromoriginal),states:

IntheunlikelyeventthatbothPCSrecirculationpumpsareunavailable,theselfpoweredPCSrecirculationpump

equivalent,willtakesuctionfromthePCCAWSTviatheconnectionaddedtotheoverflow/drainline(Reference

66).Insteadoftheportablepumpsupplycomingfromtheclosest,river,lake,oroceansource,anddischarging

toasafetyrelated,seismicallyqualifiedflange(References48and49)usingfirehose,aseparatePCCAWST

makeuppumpwilldrawwaterfromtheSavannahRiverandprovidemakeuptothePCCAWST.Thisallows

makeuptotheSFPandthepassivecontainmentcoolingwaterstoragetank(PCCWST)ashighlightedonFigure2

ofReference2.TheminimumrequiredheadandmaximumpumpdischargeheadforthePCSrecirculationpump

equivalentisdocumentedinTable31Section11ofReference18.TheSAFERpumpswillmeetthesecriteria.



Thisisnotconsideredachangetothecompliancemethodasthestrategystillusestwopumpsandtheultimate

watersourceisstilltheriver.ThedifferencehereisthattheseismiccategoryIIPCCAWSTremainsbetweenthe

twopumpsandthestrategynolongerhasthepumpsdirectlyinseries.Thismodificationisconsideredan

operationalenhancementandstillmeetstheintentoftheoriginalstrategy.



3. TheNRCaskedadditionalquestionsandprovidedOEandotherthingstoconsiderfortheFIP.



x NRCaskedisthereafueloilreplenishmentstrategy?



ReferenceprocedureNMPOS019367VogtleUnitDSIG7,DieselFuelOilTransferforstrategy.



x NRCaskedisthereadequateultralowsulfurfueloilbasedontheuseoftheUnit1&2fuelsupplyfor

Unit3and4debrisclearing/towingcapability?



TheNMPOS019367procedureprovidesdirectionforresupplyoffueloilsupplyvolume.



x TheNRCsharedsomeOEaboutphaserotationconcerningconnectingbackupdiesels.



Units3&4areconsideringphaserotationinourconfigurations



x TheNRCsharedthattheoperatingfleethadtoaddresshydrogenbuildupfrombatterycharging.



ForFLEX,VEGPUnits3&4donotrechargethebatteriesinthemitigationoftheeventandthereisno

sourceofhydrogentoconsider.



x TheNRCstatedthatUnits1&2hasPMPfloodingissueswithpondingontheirhaulpathandaskedifwe

hadconsideredit?



ThereisanevaluationcompletedforUnits3&4titled,FLEXDeploymentRouteDebrisAssessment,which

isAttachment2toprocedureNMPGM038004,VEGP34DiverseandFlexibleCopingStrategies(FLEX)

ProgramDocument.Thatattachmentlooksattheeffectsofapplicableextremeexternalhazardsonthe

deploymentpathsincludingflooding.Theattachmentisbasedonthefollowingreports:

o 2316200030RM10R00003,Version1.0,VEGPUnits3and4FLEXDebrisRemoval

Assessment

o 2316200030RM10R00004,Version1.0,VEGPUnits3and4FLEXExternalHazards

Evaluation

InAttachment2oftheFLEXprogramdocumentitstates:

TheonlyprobablefloodingatVEGPwouldbeduetoextremeprecipitation.Somedebris

wouldbedeposited.Itwillbelimitedtosmallfloatingitems.Thisisconsideredminimaland

notanadverseimpacttositetravel.

x TheNRCreviewersrecalledthattheUnits1&2severeweatherprocedurehadsomeactionsforcold

weather,andtheyneededtoaddressiceconditionsfortheirhaulpaths.



ThereisanevaluationcompletedforUnits3&4titled,FLEXDeploymentRouteDebrisAssessment,which

isAttachment2toprocedureNMPGM038004,VEGP34DiverseandFlexibleCopingStrategies(FLEX)

ProgramDocument.Thatattachmentlooksattheeffectsofapplicableextremeexternalhazardsonthe

deploymentpathsincludingicing.Theattachmentisbasedonthefollowingreports:

o 2316200030RM10R00003,Version1.0,VEGPUnits3and4FLEXDebrisRemovalAssessment

o 2316200030RM10R00004,Version1.0,VEGPUnits3and4FLEXExternalHazardsEvaluation

InAttachment2oftheprogramdocumentitstates:

Icebuildupcouldconceivablyaffecttheintegrityofanonrobuststructurewithicebuildup

onrooftops,etc.Thiswouldmostlikelyresultinacollapseofasmallportionofthebuilding

withintheexistingbuildingfootprint.Althoughpartialstructuralcollapsesmayoccur,there

arenobuildingsinthetravelpaththatwouldadverselyaffecttransportation.Extremecold

andicebuildupcouldconceivablyresultindownedpowerlinesandtrees.Anydownedlines

canberemovedwiththeonsitedebrisremovalequipment.

Units1&2haveamoreurgentrequirementforusingthehaulpathstostageFLEXequipment.However,

Units3&4doesntstageFLEXequipmentforthefirst72hoursensuringadequatetimetoaddress

possibleicyroadwaysand/ordebris.



x NRCaskedwhydowetalkaboutRemoteShutdownroomin2.14butnowwhereelse?Isthatokaythat

itisn'tcoveredanywhereelse?



TheRSRisnotpartoftheflexstrategy.ThementionoftheRSRintheOIPisdescribingnormallighting

anditsassociatedpowersupplies.Thefurtherdiscussionofthestrategyisfocusedonprovidinglighting

tothecontrolroom.Noactionrequired.