ML20257A013
| 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 PerformanceCriteria Notes
PortableEquipment
PCS/SFPMakeup 135gpmat236ft.developedheadand100gpmat Oneportabletrailermounteddiesel Pump 273ft.developedhead. drivenpumpperunit.Plus,thereis
onesparepump.
PumptakessuctionfromPCCAWSTtoyardsafety
relatedflangeconnectionforsupportofpassive
coolingandspentfuelpoolmakeup.
PCCAWSTMakeup 300gpmpressureratingRGT300psiwithminimum Oneportabletrailermounteddiesel Pump 26ft.suctionlift. drivenpumpthatiscapableof
providingadequateflowtobothunits
UsedforindefinitemakeuptothePCCAWSTby simultaneously.Plus,thereisone
pumpingwaterfromtheSavannahRiver.The sparepump
pumpdischargeisdirecteddirectlyintothetopof
PCCAWST.
PortableGenerators 480V,150KW,0.8PF,3PhaseWYE,plusNeutral Onetrailermounteddieseldriven
andGround,CapableofParallelOperation, portablegeneratorperunit.Plus
VoltageVariance+/5%,FrequencyVariance+/ thereisonesparegenerator
0.25%
Ventilation 1hp,1700cfm,Fan,with300ftdetachablehose, Sevensets,3perunitplusonespare.
Fans/Hose electricrating:singlephase115VAC.
ReplacesAncillary:OnefanisforMCR
whichrequires1700cfm@0.65in.ofwater.
TwofansforI&Croomswhichrequires1500
cfm@0.71inchesofwater.
VentilationDuct AntiStatic,16diameterin25ftlengths 16lengths,8lengthsperunit.
FireHose 5inchdoublejacket,300psiservicepressurehose Totalof220lengthsin
in50ftlengths. supportofallpumpsfor
bothunits.
TemporaryCabling/ Powercable600V,1/C,4/0AWG,in100ft Total4000ft.of4/0AWGforeach
Adapters lengths conductor(2000ft.foreachunit)
PowercableSuperTRX2/3CPPAcable,in50ft. Total1600ft.0fTRXcable(800ft
lengths 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
RAI responses and communicate the continued validity or point to the updated/changed information
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. Consistent withNEI1206,Section3.2.2.16,3piecesof
portable equipment will be provided when a separate train is needed for each unit (portable generator and
PCCWST Makeup Pump) and two pieces will be provided when a single train can supply both units (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
offsite portable generator in this alternate configuration. Therefore, the nominal rating of 80 kW / 480V is
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, these components are rugged components located in nuclear seismic structures with
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
to a safetyrelated,seismicallyqualified flange (References 48 and 49) using fire hose, a separate PCCAWST
makeup pump will draw water from the Savannah River and provide makeup to the PCCAWST. This allows
makeuptotheSFPandthepassivecontainmentcoolingwaterstoragetank(PCCWST)ashighlightedonFigure2
ofReference2.TheminimumrequiredheadandmaximumpumpdischargeheadforthePCSrecirculationpump
equivalentisdocumentedinTable31Section11ofReference18.TheSAFERpumpswillmeetthesecriteria.
Thisisnotconsideredachangetothecompliancemethodasthestrategystillusestwopumpsandtheultimate
watersourceisstilltheriver.ThedifferencehereisthattheseismiccategoryIIPCCAWSTremainsbetweenthe
two pumps and the strategy no longer has the pumps directly in series. This modification is considered an
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, Version 1.0, VEGP Units 3 and 4 FLEX Debris Removal
Assessment
o 2316200030RM10R00004,Version1.0,VEGPUnits3and4FLEXExternalHazards
Evaluation
InAttachment2oftheFLEXprogramdocumentitstates:
TheonlyprobablefloodingatVEGPwouldbeduetoextremeprecipitation.Somedebris
wouldbedeposited.Itwillbelimitedtosmallfloatingitems.Thisisconsideredminimaland
notanadverseimpacttositetravel.
x The NRC reviewers recalled that the Units 1&2 severe weather procedure had some actions for cold
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,
Units 3 & 4 doesnt stage FLEX equipment for the first 72 hours ensuring adequate time to address
possibleicyroadwaysand/ordebris.
x NRCaskedwhydowetalkaboutRemoteShutdownroomin2.14butnowwhereelse?Isthatokaythat
itisn'tcoveredanywhereelse?
TheRSRisnotpartoftheflexstrategy.ThementionoftheRSRintheOIPisdescribingnormallighting
anditsassociatedpowersupplies.Thefurtherdiscussionofthestrategyisfocusedonprovidinglighting
tothecontrolroom.Noactionrequired.