ML110140055

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TSTF-523 Meeting Presentation
ML110140055
Person / Time
Site: Technical Specifications Task Force
Issue date: 01/12/2010
From:
Technical Specifications Task Force, PWR Owners Group
To:
Office of Nuclear Reactor Regulation
References
Download: ML110140055 (42)
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Text

Technical Specifications Task Force A Joint Owners Group Activity TSTF DiscussionoftheAppropriateRegulatory M

h i

t C t

th O G i MechanismtoCapturetheOnGoing RequirementsofGenericLetter200801, "M

i G

A l ti i E "ManagingGasAccumulationinEmergency CoreCooling,DecayHeatRemoval,and C

t i t S S

t ContainmentSpraySystems" J

12 2010 January12,2010 1

Technical Specifications Task Force A Joint Owners Group Activity TSTF TSTF523

  • The TSTF submitted TSTF523, Revision 0, "Generic TheTSTFsubmittedTSTF 523,Revision0, Generic Letter(GL)200801,ManagingGasAccumulation,"

onJune29,2010.

  • TheTravelerproposedto:

- ExpandtheLCOBasesdescribinggasmanagementasan importantaspectofsystemOperability,

- AddaGasManagementProgramtotheFSARwhich describes the ongoing aspects of gas management and describestheongoingaspectsofgasmanagement,and

- ReplacetheexistingSRswiththeGasManagement Programrequirements.

2

Technical Specifications Task Force A Joint Owners Group Activity TSTF i

MeetingPurpose

  • The NRC staff is still considering whether to accept TheNRCstaffisstillconsideringwhethertoaccept TSTF523.

- Thestaffisconsideringwhethertheproposedapproachis acceptableorwhetherthesomeactionstakeninresponse totheGLshouldbecapturedintheTechnical Specifications (TS)

Specifications(TS).

  • Thepurposeoftoday'smeetingistodiscussthe appropriateregulatorymechanismtocapturethe pp p

g y

p ongoingrequirementstomanagegasaccumulation.

3

Technical Specifications Task Force A Joint Owners Group Activity TSTF h

i d

i h bili TheGLisConcernedwithSystemOperability

  • Under "Requested Actions" the GL stated:

Under RequestedActions theGLstated:

"TheNRCrequeststhateachaddresseeevaluateits ECCS,DHRsystem,andcontainmentspraysystem y

p y y licensingbasis,design,testing,andcorrectiveactions toensurethatgasaccumulationismaintainedless thantheamountthatchallengesoperability of thesesystems,andthatappropriateactionistaken when conditions adverse to quality are identified "

whenconditionsadversetoqualityareidentified."

4

Technical Specifications Task Force A Joint Owners Group Activity TSTF There Have Been Many GLs on Aspects of System ThereHaveBeenManyGLsonAspectsofSystem Operability

  • GL 0801 is not unique. As discussed in the GL08 01isnotunique.Asdiscussedinthe justificationforTSTF523,theNRChasissuedmany GLsthataddressanaspectofOperability.
  • TheNRCstaffhasusedtheinspectionprocessto ensurethelicenseeresponsestotheseGLscontinue tobeimplemented.
  • Examininginspectiondatasince2001:

- GL8908,"Erosion/CorrosionInducedPipeWallThinning,

  • 18referencesininspectionreports

- GL8712,"LossofResidualHeatRemoval(RHR)WhiletheSystem

(

)

y (RCS)isPartiallyFilled,

  • 18referencesininspectionreports 5

Technical Specifications Task Force A Joint Owners Group Activity TSTF There Have Been Many GLs on Aspects of System ThereHaveBeenManyGLsonAspectsofSystem Operability

- GL8817,"LossofDecayHeatRemoval,

  • 159referencesininspectionreports,1NCV

- Example:"ProcedureswerereviewedforcommitmentstoGL 8817toverifythatthesecommitmentswereinplace" y

p

- GL8910,"SafetyRelatedMotorOperatedValveTestingand Surveillance,

  • 115 references in inspection reports 4 NCVs or Violations 115referencesininspectionreports,4NCVsorViolations

- GL8913,"ServiceWaterSystemProblemsAffectingSafetyRelated Equipment,

  • 574 references in inspection reports > 10 NCVs or Violations
  • 574referencesininspectionreports,>10NCVsorViolations

- GL9704,"AssuranceofSufficientNetPositiveSuctionHeadfor EmergencyCoreCoolingandContainmentHeatRemovalPumps.

15 f

i i i

4 NCV Vi l i

  • 15referencesininspectionreports,4NCVsorViolations 6

Technical Specifications Task Force A Joint Owners Group Activity TSTF There Have Been Many GLs on Aspects of System ThereHaveBeenManyGLsonAspectsofSystem Operability

  • Licensee responses to GLs have proven to be durable LicenseeresponsestoGLshaveproventobedurable andenforceable.
  • Licenseesrespondedtotheseissuesbyperforming p

y p g

testing,makingmodifications,revisingtesting procedures,preventivemaintenancemeasures,etc.,

withouttheadoptionofadditionalTSrequirements.

  • GL0801isnomoresafetysignificant,complex,or d

b l h

h h

tiedtoOperabilitythantheotherissues.

  • GL0801shouldbetreatedconsistentlywithother GL t

f O bilit GLsonaspectsofOperability.

7

Technical Specifications Task Force A Joint Owners Group Activity TSTF i

ifi f h i i i

SignificanceoftheExistingSRsonVentingGas

  • The NRC staff has discussed whether GL 0801 TheNRCstaffhasdiscussedwhetherGL08 01 shouldbetreateddifferentlythanprevious OperabilityissuesthatwerethesubjectofGLs becausethereisanexistingSurveillancethat requiresverifyingthatthesystempipingisfullof t

water.

  • ThepresenceoftheexistingSRsshouldnotresultin GL 08 01 being treated differently than the other GLs GL0801beingtreateddifferentlythantheotherGLs regardingOperability.

8

Technical Specifications Task Force A Joint Owners Group Activity TSTF i

ifi f h i i i

SignificanceoftheExistingSRsonVentingGas

- IntheGL,theNRCnotedthattheISTSandmostTScontain SRstoverifythatportionsofthesubjectsystemsarefullof water,butdidnotrelyonTScomplianceastheregulatory basis for the GL basisfortheGL.

  • Thescope&frequencyoftheverificationvaries betweendesignsandplants,andsomeplantshaveno similarTSrequirements.
  • TheTSrequiresverificationthatpipingisfullofwater, which is subject to interpretation whichissubjecttointerpretation.

9

Technical Specifications Task Force A Joint Owners Group Activity TSTF i

ifi f h i i i

SignificanceoftheExistingSRsonVentingGas

  • It is not unique for the NRC staff to determine that ItisnotuniquefortheNRCstafftodeterminethat existingSRsshouldnotbeinTSandtheyhavebeen removed,forexample:

- GL9401,RemovalofAcceleratedTestingandSpecial ReportingRequirementsforEmergencyDieselGenerators h d l

f h

  • DuringthedevelopmentoftheISTSmanySRswere relocatedordeleted.

During a recent ITS conversion of an STS plant 10 SRs were

- DuringarecentITSconversionofanSTSplant,10SRswere relocatedtolicenseecontrolinadditiontothemany Specificationsthatwererelocated.

10

Technical Specifications Task Force A Joint Owners Group Activity TSTF i

ifi f h i i i

SignificanceoftheExistingSRsonVentingGas

  • The existing SRs do not contribute to the LCO TheexistingSRsdonotcontributetotheLCO requirementthatthesystemsbeOperable.

- InTIA200803response,theNRCstatedtheintentofthe SRmaybemetifthelicenseecanestablishthroughan Operabilitydeterminationthatthereisareasonable expectation that the system in question will perform its expectationthatthesysteminquestionwillperformits specifiedsafetyfunction.

11

Technical Specifications Task Force A Joint Owners Group Activity TSTF i

ifi f h i i i

SignificanceoftheExistingSRsonVentingGas

  • Considering all of the above, the existence of the SRs Consideringalloftheabove,theexistenceoftheSRs isnotsignificantandshouldnotbeafactorin determiningtheappropriateregulatorymechanism tocapturetheongoingrequirementsoftheGL.
  • Weshouldstartwitha"cleanslate."

12

Technical Specifications Task Force A Joint Owners Group Activity TSTF What are the OnGoing Requirements on Gas WhataretheOn GoingRequirementsonGas Management?

  • In the GL, the NRC identified the following four IntheGL,theNRCidentifiedthefollowingfour principleareastobeaddressed:

- LicensingBasis

- Design

- Testing

- CorrectiveActions

  • LicenseesrespondingtotheGLusedtheNEI t

l t hi h dd d th t i

templatewhichaddressedthetopics.

  • Thefollowingslidesaddresstheongoing requirements identified in the responses requirementsidentifiedintheresponses.

- ThisinformationisintheTSTF523justification.

13

Technical Specifications Task Force A Joint Owners Group Activity TSTF What are the OnGoing Requirements on Gas WhataretheOn GoingRequirementsonGas Management?

  • Licensing Basis Evaluation LicensingBasisEvaluation

- TheCurrentLicensingBasiswasreviewedwithrespecttogas accumulationforthesystemstobeevaluated.

TS requirements such as "Operable flow path" or "Operable

- TSrequirementssuchas Operableflowpath or Operable train/subsystem"wereconfirmedtoinherentlyincludethe requirementthatentrainedgasislimitedsuchthattheflowpathor train/subsystem remains Operable train/subsystemremainsOperable.

  • TSTF523addsentrainedgasinformationtothe systemLCOBasestocaptureandreinforcethis y

p requirement.

14

Technical Specifications Task Force A Joint Owners Group Activity TSTF What are the OnGoing Requirements on Gas WhataretheOn GoingRequirementsonGas Management?

  • Design Evaluation DesignEvaluation

- DesignBasisDocumentswerereviewedwithrespecttogas accumulationforthesystemstobeevaluatedandthe resultsweredocumentedintheresponsetotheGL.

- Aspartofthedesignreview,theresponseincluded:

  • Identify all system vents and high points and use of additional
  • Identifyallsystemventsandhighpointsanduseofadditional ventswhereneeded.
  • Identificationofprocedurerevisionsornewproceduresrelatedto fill and vent activities fillandventactivities.
  • Identificationofpotentialgasintrusionmechanismsintoeach systemforeachpipingsegmentthatisvulnerabletogasintrusion.
  • Procedural acceptance criteria on gas volume for each piping
  • Proceduralacceptancecriteriaongasvolumeforeachpiping segmentineachsystemwheregascanaccumulate.

15

Technical Specifications Task Force A Joint Owners Group Activity TSTF What are the OnGoing Requirements on Gas WhataretheOn GoingRequirementsonGas Management?

  • Design Evaluation DesignEvaluation

- Theseongoingrequirementsrelatedtodesignand proceduresarecapturedintheproposedFSARGas ManagementProgramandinimplementingplant procedures.

16

Technical Specifications Task Force A Joint Owners Group Activity TSTF What are the OnGoing Requirements on Gas WhataretheOn GoingRequirementsonGas Management?

ProposedFSARGasManagementProgram ThepipingsystemsaddressedintheresponsetoNRCGenericLetter200801,"ManagingGas AccumulationinEmergencyCoreCooling,DecayHeatRemoval,andContainmentSpraySystems,"

havethepotentialtodevelopvoidsandpocketsofentrainedgases.Maintainingthepump suctionanddischargepipingsufficientlyfullofwaterisnecessarytoensurethatthesystemwill g p p g y

y y

performproperlyandwillinjecttheflowassumedinthesafetyanalysesintotheRCSupon demand.Thiswillalsopreventpumpcavitation,waterhammer,andpumpingnoncondensable gas(e.g.,air,nitrogen,orhydrogen)intothereactorvesselfollowingaSafetyInjection(SI)signal orduringshutdowncooling.ConsistentwiththeresponsetoGL200801dated[DATE]andthe g

g p

[

]

NRC'sclosureoftheGenericLetteron[DATE],theproceduresimplementingtheGas ManagementProgramaddressthefollowingelements:

a.

Identificationofthesystems/subsystemsforwhichgasaccumulationismanaged; b

Identification of gas void monitoring frequencies and modifications thereto; b.

Identificationofgasvoidmonitoringfrequenciesandmodificationsthereto; c.

Identificationofacceptancecriteria; d.

Identificationofgasvoidmonitoringlocationsinsuctionanddischargepiping; e.

Proceduresfordocumentingandmanagingactivitiesanddata; g

g g f.

Proceduresdefiningcorrectiveactions;and g.

Identificationofmethodologyusedtodetermineacceptancecriteria.

17

Technical Specifications Task Force A Joint Owners Group Activity TSTF What are the OnGoing Requirements on Gas WhataretheOn GoingRequirementsonGas Management?

  • Testing Evaluation TestingEvaluation

- Plantprocedureswerereviewedandrevised,asrequired,andnew proceduresweredeveloped.

Procedures addressed or were modified to address the manual

- Proceduresaddressedorweremodifiedtoaddressthemanual operationoftheRHR/DHRsystemincludingassurancethatthe RHR/DHRsystemissufficientlyfullofwatertoperformitssafety function and how pump operation is monitored by plant personnel functionandhowpumpoperationismonitoredbyplantpersonnel.

- Proceduresweremodifiedasneededtoensuregasintrusiondoesnot occurasaresultofinadvertentdrainingduetosystemrealignmentsor incorrect maintenance procedures incorrectmaintenanceprocedures.

- Proceduresweremodifiedasneededtorequireanydiscoveredgas voidstobedocumented,dispositioned,andtrended.

These on going requirements related to design and procedures are Theseongoingrequirementsrelatedtodesignandproceduresare capturedintheproposedFSARGasManagementProgramandin implementingplantprocedures.

18

Technical Specifications Task Force A Joint Owners Group Activity TSTF What are the OnGoing Requirements on Gas WhataretheOn GoingRequirementsonGas Management?

  • Corrective Actions CorrectiveActions

- IntheirresponsetotheGL,licenseesexplainedthethreshold (acceptancecriteria)forentryintotheCorrectiveActionProgram (CAP) and how the CAP addresses disposition and trending (CAP)andhowtheCAPaddressesdispositionandtrending.

- ForgasvoidslessthantheCAPthreshold,licenseesdescribedhow thesegasvoidsaredocumentedandtrendedasameanstodetect system changes that may be indicative of degradation leading to systemchangesthatmaybeindicativeofdegradationleadingto futuregasvoiding.

  • TheCAPisinaccordancewiththelicenseesAppendixBQA program.
  • Thedocumentationandtrendingrequirementsarecaptured intheproposedFSARGasManagementProgram.

p p

g g

19

Technical Specifications Task Force A Joint Owners Group Activity TSTF What are the OnGoing Requirements on Gas WhataretheOn GoingRequirementsonGas Management?

  • All of the ongoing requirements are captured in the Alloftheon goingrequirementsarecapturedinthe changesproposedinTSTF523.

20

Technical Specifications Task Force A Joint Owners Group Activity TSTF What are the OnGoing Requirements on Gas WhataretheOn GoingRequirementsonGas Management?

  • There are only a few ongoing actions that resemble Thereareonlyafewon goingactionsthatresemble anyrequirementsinTS:

- EntrainedgasisanaspectofsystemOperability.

  • TSTF523capturesthisintheLCOBases.IntheISTS,thedetailsof systemOperabilityarealwaysdescribedintheLCOBases.

- Procedural acceptance criteria on gas volume for each Proceduralacceptancecriteriaongasvolumeforeach pipingsegmentineachsystemwheregascanaccumulate.

  • TheFSARChapter6andChapter15analyseswhichformthebasis f th TS LCO d t

ifi t

f t

i d

oftheTSLCOsdonotassumespecificamountsofentrainedgas, onlythatthesystemsperformasrequired.Therefore,thereisno requirementappropriateforTSbeyondtheexistingrequirement that the system be Operable thatthesystembeOperable.

21

Technical Specifications Task Force A Joint Owners Group Activity TSTF What are the OnGoing Requirements on Gas WhataretheOn GoingRequirementsonGas Management?

- Proceduresrelatedtofillandventactivitiesandother systemmanipulationsthatcouldinduceentrainedgasand procedurestorequireanydiscoveredgasvoidstobe documented dispositioned and trended documented,dispositioned,andtrended.

  • ProcedurerequirementsarealreadyaddressedinTS5.4.Itreferences RegulatoryGuide1.33whichspecificallyaddressesfillandvent operations.

operations.

  • Documentation,dispositionandtrendingofgasvoidsfallsunderthe AppendixBQualityAssuranceProgramasaconditionadversetoquality.
  • AppendixB,CriteriaVandXIrequireprocedures"appropriatetothe pp q

p pp p

circumstances,"andincluding"appropriatequantitativeorqualitative acceptancecriteria."

  • Weidentifiednoongoinggasmanagementrequirements g

g g g

q thatarenotadequatelyaddressedbyexistingrequirements ortherequirementsproposedinTSTF523.

22

Technical Specifications Task Force A Joint Owners Group Activity TSTF h

h i

i

?

WhyNotPuttheRequirementsinTS?

- ItwouldbecontrarytoNRCpolicy("FinalPolicyStatement y

p y (

y forTechnicalSpecificationImprovementsforNuclear PowerPlants"):

since 1969 there has been a trend towards including in since1969therehasbeenatrendtowardsincludingin technicalspecificationsnotonlythoserequirementsderivedfrom theanalysesandevaluationincludedintheplant'ssafetyanalysis report but also essentially all other NRC requirements governing reportbutalsoessentiallyallotherNRCrequirementsgoverning theoperationofnuclearpowerplants.IntheCommission's view,thishasdivertedbothNRCstaffandlicenseeattentionfrom themoreimportantrequirementsinthesedocumentstothe p

q extentthatithasresultedinanadversebutunquantifiableimpact onsafety."

23

Technical Specifications Task Force A Joint Owners Group Activity TSTF h

h i

i

?

WhyNotPuttheRequirementsinTS?

- TheFinalPolicyStatementalsostates:

y

  • "ThepurposeofTechnicalSpecificationsistoimposethose conditionsorlimitationsuponreactoroperationnecessaryto obviatethepossibilityofanabnormalsituationoreventgivingrise p

y g

g toanimmediatethreattothepublichealthandsafetyby identifyingthosefeaturesthatareofcontrollingimportanceto safetyandestablishingonthemcertainconditionsofoperation whichcannotbechangedwithoutpriorCommissionapproval.

- TheISTS,whichweredevelopedinresponsetotheFinalPolicy Statement,retainedintheTechSpecsthoseparametersthatcanbe tiedbacktospecificsafetyanalysisassumptions,suchassetpoints, tankvolumes,pumpflowrates,etc.

- Gasmanagementissimplyoneofamyriadoffactorsthatsupport systemOperability.Itisnotof"controllingimportance"andthereare nospecificsafetyanalysisassumptionsonwhichtobaseaTS requirement.

24

Technical Specifications Task Force A Joint Owners Group Activity TSTF h

h i

i

?

WhyNotPuttheRequirementsinTS?

  • We determined a Surveillance is not appropriate for WedeterminedaSurveillanceisnotappropriatefor thisapplication:

- Surveillancesrequireperformanceofspecificverificationstomeet d

h f

d statedacceptancecriteriawithinfixedFrequencies.

- ImpositionofanSRwithspecificmethods,scope,andacceptance criteriawouldlikelyresultinsubstantialoverperformanceofsome i i i d

d f

f h

d di l

activitiesandunderperformanceofothers,dependingonplant design,andfuturemodificationasmoreislearned,bothgenerically andplantspecifically.

25

Technical Specifications Task Force A Joint Owners Group Activity TSTF h

h i

i

?

WhyNotPuttheRequirementsinTS?

  • We determined a Surveillance is not appropriate for WedeterminedaSurveillanceisnotappropriatefor thisapplication:

- AspecificSRisnotnecessarytomeettherequirementsof10CFR (d)( ) b h

f d

b dd d h

50.36(d)(3),becausethespecificconsiderationsareembeddedinthe LCO,whichsatisfiestherequirementsforLCOsin10CFR50.36(d)(2)(i) and(d)(2)(ii)(C).

(d)(3)

S ill i

i l

i

  • (d)(3)states:Surveillancerequirementsarerequirementsrelating totest,calibration,orinspectiontoassurethatthenecessary qualityofsystemsandcomponentsismaintained,thatfacility operation will be within safety limits and that the limiting operationwillbewithinsafetylimits,andthatthelimiting conditionsforoperationwillbemet.

- ThisisconsistentwithsimilarOperabilityconsiderations(seismic, lubrication EQ cooling etc )

lubrication,EQ,cooling,etc.)

26

Technical Specifications Task Force A Joint Owners Group Activity TSTF h

h i

i

?

WhyNotPuttheRequirementsinTS?

  • The industry considered creating a TS Administrative TheindustryconsideredcreatingaTSAdministrative Controlsprogramthatstatedtheminimum requirementsforthelicensee'sprogramtomanage entrainedgas.

27

Technical Specifications Task Force A Joint Owners Group Activity TSTF h

h i

i

?

WhyNotPuttheRequirementsinTS?

  • Aprogramforsafetysystemgasmanagementwouldnotmeet p

g y y g

g thedefinitionofAdministrativeControlsprovidedin10CFR 50.36(d)(5).

"Ad i i t ti t

l th i i l ti t

- "Administrativecontrolsaretheprovisionsrelatingto organizationandmanagement,procedures, recordkeeping,reviewandaudit,andreportingnecessary toassureoperationofthefacilityinasafemanner."

  • Gasmanagementdoesnotmeetanyofthosecriteriaother than "procedures" which is already addressed by the TS than procedures whichisalreadyaddressedbytheTS Section5.4,"Procedures,"referencetoRegulatoryGuide1.33 whichrequiresproceduresforfillandventoperations.

28

Technical Specifications Task Force A Joint Owners Group Activity TSTF h

h i

i

?

WhyNotPuttheRequirementsinTS?

  • A TS Administrative Controls program is not ATSAdministrativeControlsprogramisnot appropriateforthisapplication:

- EntrainedgasisoneofmanyaspectsofOperability,mostof whicharenotexplicitlystatedinTS,suchascoolingwater, flowbalancing,recirculationflow,componentintegrity,and lubrication.

Justlikeentrainedgas,theseotheraspectsofOperabilityare establishedandverifiedbylicenseedesigncontrol, operations and maintenance programs all of which are operationsandmaintenanceprograms,allofwhichare subjecttotheQualityAssurancerequirementsestablishedin 10CFR50,AppendixBandthedefinitionofOperability.

f h

f b l

- CreatingaTSprogramforthisoneaspectofOperability wouldbeinconsistentwithNRCprioractionsandtheTS format.

29

Technical Specifications Task Force A Joint Owners Group Activity TSTF h

h i

i

?

WhyNotPuttheRequirementsinTS?

  • In the Standard Technical Specifications, the LCO IntheStandardTechnicalSpecifications,theLCO Bases describethespecificrequirementsforasystem tobeOperable.
  • TSTF523proposestoexpandtheLCOBaseswitha statementsimilarto:

- "Managementofgasvoidsisimportantto[systemname]

OPERABILITY.Gasvoidsaremanagedbyplantprocedures and processes as described in the Final Safety Analysis andprocesses,asdescribedintheFinalSafetyAnalysis Report(Ref.X)."

30

Technical Specifications Task Force A Joint Owners Group Activity TSTF Placing the Gas Management Program in the FSAR PlacingtheGasManagementProgramintheFSAR ProvidesDurableGuidance

  • InresponsestomostGLslicenseesmakecommitmentsto p

takecertainactions.Thesecommitmentscanbemanaged underNEI9904.

We have demonstrated it has been effective for over 20 years for

- Wehavedemonstratedithasbeeneffectiveforover20yearsfor manyGLs.

  • InTSTF523,theindustryisproposingtoplacethedetailsof theGasManagementProgramintheFSARtoensure the durabilityoftherequirements.
  • Changes to the Gas Management Program would be ChangestotheGasManagementProgramwouldbe evaluatedunder10CFR50.59.
  • Theprovisions10CFR50.59areappropriatetoensurean adequatereviewofanychangestotheGasManagement Programwillbeperformed.

31

Technical Specifications Task Force A Joint Owners Group Activity TSTF Placing the Gas Management Program in the FSAR PlacingtheGasManagementProgramintheFSAR ProvidesDurableGuidance

  • Example:

Example:

- AplanthasincorporatedtheGasManagementProgramproposedin TSTF523intheirFSAR.

  • These are the essential elements of a program that manages gas

- TheNRCcaninspectthelicenseesimplementationofthisprogramin plant procedures as was shown for other Generic Letters plantprocedures,aswasshownforotherGenericLetters.

- Supposethelicenseedesirestochangetheattribute:

"b.Identificationofgasvoidmonitoringlocationsinsuctionand discharge piping;"

dischargepiping; suchthatthedischargepipingisremovedfromthescopeofthe monitoringlocations.

32

Technical Specifications Task Force A Joint Owners Group Activity TSTF Placing the Gas Management Program in the FSAR PlacingtheGasManagementProgramintheFSAR ProvidesDurableGuidance

Takingeachofthecriteriaof10CFR50.59inorder:

- (i)Resultinmorethanaminimalincreaseinthefrequencyof occurrenceofanaccidentpreviouslyevaluatedinthefinalsafety analysis report (as updated) analysisreport(asupdated).

  • Voidsindischargepipingwouldhavenobearingonthelikelihood ofadesignbasisaccident(DBA)occurring.

33

Technical Specifications Task Force A Joint Owners Group Activity TSTF Placing the Gas Management Program in the FSAR PlacingtheGasManagementProgramintheFSAR ProvidesDurableGuidance

Takingeachofthecriteriaof10CFR50.59inorder:

- (ii)Resultinmorethanaminimalincreaseinthelikelihoodofoccurrenceofa malfunctionofastructure,system,orcomponent(SSC)importanttosafety previouslyevaluatedinthefinalsafetyanalysisreport(asupdated);

  • Voidsindischargepipingcertainlycouldresultinmorethanaminimal increaseinthelikelihoodofoccurrenceofamalfunctionoftheaffected system(s).Thelicenseewouldhavetohavedonesomethingconclusiveto t

id i th di h

i i h

d i

difi ti t

preventvoidsinthedischargepiping,suchasdesignmodifications,to allowthisquestiontobeanswered"no."Evenso,thelicenseecannot precludethosetimeswhenthesystemhasbeenopenedformaintenance, andfailuretofollowproperfillandventprocedures,intheabsenceof p

p p

monitoringthedischargepipingafterfillandvent,wouldprobablyresult inmorethanaminimalincreaseinthelikelihoodofmalfunctiondueto undetectedvoids.

34

Technical Specifications Task Force A Joint Owners Group Activity TSTF Placing the Gas Management Program in the FSAR PlacingtheGasManagementProgramintheFSAR ProvidesDurableGuidance

Takingeachofthecriteriaof10CFR50.59inorder:

- (iii)Resultinmorethanaminimalincreaseintheconsequencesofan accidentpreviouslyevaluatedinthefinalsafetyanalysisreport(as updated);

updated);

  • IfCriterioniicannotbeansweredas"no,"thiscriterionwouldalso requireNRCpriorreview.FailureoftheECCStoperformas designed due to gas voids in discharge piping would almost designedduetogasvoidsindischargepipingwouldalmost certainlyresultinmorethanaminimalincreaseinconsequences (radiologicaldosetothegeneralpublicandcontrolroom operators).

p

)

35

Technical Specifications Task Force A Joint Owners Group Activity TSTF Placing the Gas Management Program in the FSAR PlacingtheGasManagementProgramintheFSAR ProvidesDurableGuidance

Takingeachofthecriteriaof10CFR50.59inorder:

- (iv)Resultinmorethanaminimalincreaseintheconsequencesofa malfunctionofanSSCimportanttosafetypreviouslyevaluatedinthe final safety analysis report (as updated);

finalsafetyanalysisreport(asupdated);

  • Theconsequencesoffailureofasafetysystemarenotdirectly evaluatedintheaccidentanalysis.Itistheconsequencesofthe DBA that are evaluated and the failure of a system important to DBAthatareevaluated,andthefailureofasystemimportantto safetycontributestothoseconsequences,whichisaddressedin Criterion(iii).

36

Technical Specifications Task Force A Joint Owners Group Activity TSTF Placing the Gas Management Program in the FSAR PlacingtheGasManagementProgramintheFSAR ProvidesDurableGuidance

Takingeachofthecriteriaof10CFR50.59inorder:

- (v)Createapossibilityforanaccidentofadifferenttypethanany previouslyevaluatedinthefinalsafetyanalysisreport(asupdated);

  • The proposed change to remove the discharge piping from the
  • Theproposedchangetoremovethedischargepipingfromthe monitoringlocationswouldnotcreateanewtypeofaccident.

37

Technical Specifications Task Force A Joint Owners Group Activity TSTF Placing the Gas Management Program in the FSAR PlacingtheGasManagementProgramintheFSAR ProvidesDurableGuidance

Takingeachofthecriteriaof10CFR50.59inorder:

- (vi)CreateapossibilityforamalfunctionofanSSCimportanttosafety withadifferentresultthananypreviouslyevaluatedinthefinalsafety analysis report (as updated);

analysisreport(asupdated);

  • Theresultofconcernisradiologicaldosestothegeneralpublic andcontrolroomoperators.Theeffectsoftheproposedchange to remove the discharge piping from monitoring do not create a toremovethedischargepipingfrommonitoringdonotcreatea newresult,butratheraffectthemagnitudeofthepreviously evaluatedresult,whichisaddressedinCriterionii.

38

Technical Specifications Task Force A Joint Owners Group Activity TSTF Placing the Gas Management Program in the FSAR PlacingtheGasManagementProgramintheFSAR ProvidesDurableGuidance

Takingeachofthecriteriaof10CFR50.59inorder:

- (vii)Resultinadesignbasislimitforafissionproductbarrieras describedintheFSAR(asupdated)beingexceededoraltered;or

  • Unless the licensee can conclusively rule out the potential for
  • Unlessthelicenseecanconclusivelyruleoutthepotentialfor voidsindischargepiping,thiscriterionisnotmet.Failureofthe ECCSduetovoidsinthedischargepipingwouldcertainlyadversely impact calculated peak clad temperatures It would be well within impactcalculatedpeakcladtemperatures.Itwouldbewellwithin therealmofpossibilitythatthecriteriaof10CFR50.46mightbe exceeded.

39

Technical Specifications Task Force A Joint Owners Group Activity TSTF Placing the Gas Management Program in the FSAR PlacingtheGasManagementProgramintheFSAR ProvidesDurableGuidance

Takingeachofthecriteriaof10CFR50.59inorder:

- (viii)Resultinadeparturefromamethodofevaluationdescribedin theFSAR(asupdated)usedinestablishingthedesignbasesorinthe safety analyses safetyanalyses.

  • TheproposedGasManagementProgramdoesnotreferenceany methodologies.

40

Technical Specifications Task Force A Joint Owners Group Activity TSTF Placing the Gas Management Program in the FSAR PlacingtheGasManagementProgramintheFSAR ProvidesDurableGuidance

  • Therefore, placing the Gas Management Program in Therefore,placingtheGasManagementProgramin theFSARprovidesdurableguidance.
  • ChangestotheGasManagementProgramwouldbe g

g g

evaluatedunder10CFR50.59whichwillensurean adequatereviewofanychangeswillbeperformed, whichmayincludeNRCpriorreviewandapproval per10CFR50.90.

41

Technical Specifications Task Force A Joint Owners Group Activity TSTF What is the Appropriate Regulatory Mechanism to WhatistheAppropriateRegulatoryMechanismto CapturetheOngoingRequirementsfromtheGL?

  • Therefore, the appropriate regulatory mechanisms to Therefore,theappropriateregulatorymechanismsto capturetheongoingrequirementsfromtheGLare:

- Reinforcementthatgasmanagementisanimportant aspectofOperabilityintheTSBases,

- Capturingtheongoingaspectsofthelicenseeresponseto the GL in a Gas Management Program in the FSAR theGLinaGasManagementProgramintheFSAR.

- ReplacetheexistingSRswiththeGasManagement Programrequirements.

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