ML113220164

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TSTF Presentation Revision to TSTF-523
ML113220164
Person / Time
Site: Technical Specifications Task Force
Issue date: 11/17/2011
From:
NRC/NRR/DPR/PSPB
To:
References
TSTF-523
Download: ML113220164 (10)
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Text

11/17/2011 1

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF P l t R i

TSTF 523 TSTFProposaltoReviseTSTF523, "GenericLetter200801,ManagingGas Accumulation" 1

Technical Specifications Task Force A Joint Owners Group Activity TSTF August4,2011TSTF/NRCPublicMeeting AttheAugust4,2011TSTF/NRCpublicmeetingon TSTF 523 the TSTF proposed a revision to TSTF 523 TSTF523,theTSTFproposedarevisiontoTSTF523 thatwould:

  • RevisetheexistingSRstostate:

- "Verify[system]locationssusceptibletogasaccumulation aresufficientlyfilledwithwater."

  • Add similar SRs to the other systems addressed in GL
  • AddsimilarSRstotheothersystemsaddressedinGL 200801(ECCS,ContainmentSpray,andDHR)thatdo notcurrentlyhavea"fullofwater"SR.

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11/17/2011 2

Technical Specifications Task Force A Joint Owners Group Activity TSTF August4,2011TSTF/NRCPublicMeeting

SurveillanceFrequencyControlProgram.

- ForplantswithoutanSFCP,theFrequencywouldbe31 days.

- ForplantswithanSFCP,theinitialFrequencywouldbe31 days,subjecttochangeundertheSFCP.

  • TheBasesoftheSurveillancewouldacknowledge g

thatdifferentlocationsinthesystemcouldhave differentperformanceFrequenciesundertheSFCP.

3 Technical Specifications Task Force A Joint Owners Group Activity TSTF August4,2011TSTF/NRCPublicMeeting

  • TheBasesoftheSurveillanceswoulddiscuss acceptable methods of identifying locations acceptablemethodsofidentifyinglocations susceptibletogasaccumulation,gasvolume acceptancecriteria,andacceptablemethodsfor performingtheSR.
  • TheLCOBasesofthesystemswithinthescopeof GL 200801 would be revised to state that GL2008 01wouldberevisedtostatethat managementofgasvoidsisimportanttosystem OPERABILITY.

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11/17/2011 3

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF523WillNotReferenceNEI0910

  • AttheAugust4meeting,theTSTFleftopenthe possibility that TSTF 523 might reference NEI 09 10 possibilitythatTSTF523mightreferenceNEI0910.
  • Subsequently,theNEIGasAccumulationTeam determinedthatTSTF523shouldnotreferenceNEI 0910.

- ThiswasstatedintheNEIresponsetotheNRC'sRAIon NEI 0910.

NEI09 10.

  • However,informationconsistentwithstatementsin NEI0910areincludedintheproposedBases.

5 Technical Specifications Task Force A Joint Owners Group Activity TSTF DraftRevision

  • TheTSTFhaspreparedadraftTravelerrevisionfor discussion that includes the affected LCOs for discussionthatincludestheaffectedLCOsfor NUREG1431(Westinghouseplants)and NUREG1433(BWR/4plants).Thesechangesare representativeoftheotherplanttypes.
  • AsingleBasesrevisionhasbeenprepared.Thisis representative of the Bases changes for the other representativeoftheBaseschangesfortheother NUREGs.
  • Thehandoutincludesrepresentativelanguagefor theSurveillancesandtheirBases.

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11/17/2011 4

Technical Specifications Task Force A Joint Owners Group Activity TSTF DraftRevision ThefollowingLCOsareaffected:

W ti h

Pl t

WestinghousePlants

  • 3.4.6RCSLoops MODE4(NewSR)
  • 3.4.7RCSLoops MODE5,LoopsFilled(NewSR)
  • 3.4.8RCSLoops MODE5,LoopsNotFilled(NewSR)
  • 3.5.2ECCS Operating(RevisedSR) 3 6 6 Containment Spray and Cooling Systems (New SR) 3.6.6ContainmentSprayandCoolingSystems(NewSR)
  • 3.9.5ResidualHeatRemoval(RHR)andCoolantCirculation HighWaterLevel(NewSR)
  • 3.9.6ResidualHeatRemoval(RHR)andCoolantCirculation LowWaterLevel(NewSR) 7 Technical Specifications Task Force A Joint Owners Group Activity TSTF DraftRevision BWR/4Plants 3 4 8 Residual Heat Removal (RHR) Shutdown Cooling System Hot 3.4.8ResidualHeatRemoval(RHR)ShutdownCoolingSystem Hot Shutdown(NewSR) 3.4.9ResidualHeatRemoval(RHR)ShutdownCoolingSystem Cold Shutdown(NewSR) 3.5.1ECCS Operating(RevisedSR) 3.5.2ECCS Shutdown(RevisedSR) 3.5.3RCICSystem(RevisedSR)

LCO3.6.2.3TwoRHRsuppressionpoolcoolingsubsystemsshallbe OPERABLE(NewSR) 3.6.2.4ResidualHeatRemoval(RHR)SuppressionPoolSpray(NewSR) 3.9.8ResidualHeatRemoval(RHR) HighWaterLevel(NewSR) 3.9.9ResidualHeatRemoval(RHR) LowWaterLevel(NewSR) 8

11/17/2011 5

Technical Specifications Task Force A Joint Owners Group Activity TSTF DraftRevision 9

Technical Specifications Task Force A Joint Owners Group Activity TSTF DraftRevision

  • ExaminingtheSRwording:

- "Verify [system] locations susceptible to gas accumulation

- Verify[system]locationssusceptibletogasaccumulation aresufficientlyfilledwithwater"

  • InordertoallowtheSRtobemetwhenthesystemisOperable, thewording"sufficientlyfilledwithwater"waschoseninsteadof "fullofwater"or"withinlimits."
  • Thisrecognizesthatnotallportionsofasystemmayhavepre establishedOperabilitylimitsonaccumulatedgas(i.e.,the procedural limit may be zero) procedurallimitmaybezero)
  • AnOperabilityevaluationcanbeperformedtodeterminethatthe Surveillanceismetifthepreestablishedacceptancecriteriais exceeded.

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11/17/2011 6

Technical Specifications Task Force A Joint Owners Group Activity TSTF DraftRevision

  • ExaminingtheSRwording:

- The phrase "locations susceptible to gas accumulation"

- Thephrase locationssusceptibletogasaccumulation waschosensothatportionsofthesystemknowntonotbe susceptibletogasaccumulationdonotneedtobeverified.

11 Technical Specifications Task Force A Joint Owners Group Activity TSTF DraftRevision

  • TheLCOBasesforECCS,ContainmentSpray,andDHR will be revised to state willberevisedtostate "Managementofgasvoidsisimportantto[system]

OPERABILITY."

- IntheSTS,theLCOBasesdefinewhatisrequiredfor systemOperability.Thisstatement,inconjunctionwith theSR,makesclearthatgasaccumulationcanrendera systeminoperable.

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11/17/2011 7

Technical Specifications Task Force A Joint Owners Group Activity TSTF DraftRevision

  • SRBases

- Introductory paragraph on the purpose of the SR:

- IntroductoryparagraphonthepurposeoftheSR:

"[System]pipingandcomponentshavethepotentialto developvoidsandpocketsofentrainedgases.Preventing andmanaginggasintrusionandaccumulationisnecessary forproperoperationofthe[system]andmayalsoprevent waterhammer,pumpcavitation,andpumpingof noncondensible gas (e g air nitrogen or hydrogen) into the noncondensible gas(e.g.,air,nitrogen,orhydrogen)intothe reactorvessel."

13 Technical Specifications Task Force A Joint Owners Group Activity TSTF DraftRevision

  • SelectionofLocationsSusceptibletoGas Accumulation (very similar to NEI 0910):

Accumulation(verysimilartoNEI09 10):

"Selectionof[system]locationssusceptibletogas accumulationisbasedonareviewofsystemdesign information,includingpipingandinstrumentationdrawings, isometricdrawings,planandelevationdrawings,and calculations.Thedesignreviewissupplementedbysystem walk downs to validate the system high points and to confirm walkdownstovalidatethesystemhighpointsandtoconfirm thelocationandorientationofimportantcomponentsthat canbecomesourcesofgasorcouldotherwisecausegasto betrappedordifficulttoremoveduringsystemmaintenance orrestoration."

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11/17/2011 8

Technical Specifications Task Force A Joint Owners Group Activity TSTF DraftRevision

  • DiscussionofAcceptanceCriteria:

"The [system] must be sufficiently filled with water in order to be The[system]mustbesufficientlyfilledwithwaterinordertobe OPERABLE.Acceptancecriteriaareestablishedforthevolumeof accumulatedgasatsusceptiblelocations. Ifaccumulatedgasis discoveredthatexceedstheacceptancecriteriaforthesusceptible location(orthevolumeofaccumulatedgasatoneormore susceptiblelocationsexceedsanacceptancecriteriaforgas volumeatthesuctionordischargeofapump),theSurveillanceis not met If it is determined by subsequent evaluation that the notmet.Ifitisdeterminedbysubsequentevaluationthatthe

[system]isnotrenderedinoperablebytheaccumulatedgas(i.e.,

thesystemissufficientlyfullofwater),theSurveillancemaybe declaredmet.Accumulatedgasshouldbeeliminatedorbrought withintheacceptancecriterialimits."

15 Technical Specifications Task Force A Joint Owners Group Activity TSTF DraftRevision

  • DiscussionofMonitoring(verysimilartoNEI0910):

[System] locations susceptible to gas accumulation are monitored

[System]locationssusceptibletogasaccumulationaremonitored and,ifgasisfound,thegasvolumeiscomparedtotheacceptance criteriaforthelocation.Susceptiblelocationsinthesamesystem flowpathwhicharesubjecttothesamegasintrusionmechanisms maybeverifiedbymonitoringarepresentativesubsetof susceptiblelocations.Monitoringmaynotbepracticalfor locationsthatareinaccessibleduetoradiologicalorenvironmental conditions the plant configuration or personnel safety For these conditions,theplantconfiguration,orpersonnelsafety.Forthese locationsalternativemethods(e.g.,operatingparameters,remote monitoring)maybeusedtomonitorthesusceptiblelocation."

(continuedonnextslide) 16

11/17/2011 9

Technical Specifications Task Force A Joint Owners Group Activity TSTF DraftRevision

  • DiscussionofMonitoring(verysimilartoNEI0910):

"Monitoring is not required for susceptible locations where the Monitoringisnotrequiredforsusceptiblelocationswherethe maximumpotentialaccumulatedgasvoidvolumehasbeen evaluatedanddeterminedtonotchallengesystemOPERABILITY.

Theaccuracyofthemethodusedformonitoringthesusceptible locationsandtrendingoftheresultsshouldbesufficienttoassure systemOPERABILITYduringtheSurveillanceinterval."

17 Technical Specifications Task Force A Joint Owners Group Activity TSTF DraftRevision

  • DiscussionofFrequency:

For plants without a Surveillance Frequency Control Program:

ForplantswithoutaSurveillanceFrequencyControlProgram:

"The31dayFrequencytakesintoconsiderationthegradual natureofgasaccumulationinthe[system]pipingandthe proceduralcontrolsgoverningsystemoperation."

ForplantswithaSurveillanceFrequencyControlProgram:

"TheSurveillanceFrequencyiscontrolledunderthe ill l

h ill SurveillanceFrequencyControlProgram.TheSurveillance Frequencymayvarybylocationsusceptibletogas accumulation."

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11/17/2011 10 Technical Specifications Task Force A Joint Owners Group Activity TSTF Schedule

  • TheTSTFwillcreatearevisiontoTSTF523for industry review and submittal to the NRC industryreviewandsubmittaltotheNRC.
  • TheTravelershouldbesubmittedinMarch2012.

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