ML12156A205

Presentation to NRC for LAR 12

ML12156A205
Person / Time
Site:	Comanche Peak
Issue date:	05/31/2012
From:	Slough R Luminant Generation Co, Luminant Power
To:	Balwant Singal Plant Licensing Branch IV
Singal B
Shared Package
ML12156A209	List: ML12156A134 ML12156A205
References
TAC ME8616, TAC ME8615
Download: ML12156A205 (21)

Text

Addition of New Transformer XST1A AdditionofNewTransformerXST1A CPNPP

LuminantPreApplicationMeeting Agenda

Introductions

Current/ProposedPlantDesign Proposed Plant Modification Overview ProposedPlantModificationOverview TS3.8.1.andExtendedCTCurrentandProposed RiskAnalysis ProposedSchedule Questions/Feedback l

k /

ClosingRemarks/Summary

345 Kv Switchyard CurrentCPNPPOffsiteACPowerSources 345KvSwitchyard Protected Area Parker1 Parker2 OncorControl House 2MT2/1 2ST MOAS Unit2 Relay House Turbine Generator Comanche Switch Johnson Switch 2MT2/1 XST2 XST2A XST1 Unit1 Turbine Generator WolfHollow/

Benbrook Everman 1ST 1MT2/1 XST1 Relay House 25 K L Stephenville DeCordova Protected Area 25KvLoop DeCordova 138KvSwitchyard 25KvLoop

345 Kv Switchyard ProposedCPNPPOffsiteACPowerSources 345KvSwitchyard Protected Area Parker1 Parker2 OncorControl House 2ST 2MT2/1 MOAS Unit2 Relay House Turbine Generator Comanche Switch Johnson Switch 2MT2/1 XST2 XST2A XST1 Unit1 Turbine Generator WolfHollow/

Benbrook Everman 1ST 1MT2/1 XST1 Relay House 25 K L Stephenville DeCordova XST1A Protected Area 25KvLoop DeCordova 138KvSwitchyard 25KvLoop

Current

CurrentTechnicalSpecification3.8.1

Proposed

ProposedTechnicalSpecification3.8.1

XST1A Pad XST1

32-0 32-0 14-10 14-2 37-0 2-10 14-0 28-5 26-10

RiskAnalysis y

• Objectives for this section

• Objectivesforthissection

- SummarizePRAModelScopeandQuality

- Describe the Risk Assessment DescribetheRiskAssessment

- DiscusstheSensitivityAnalyses

- DiscusstheConfigurationRiskManagement ProgramandRiskReductionMeasures

PRAModelScopeandQuality p

y

• InternalEventsandInternalFloodingmodelswere developedperRG1.200Rev2requirementsandhave beenPeerReviewed PerthePeerReviewTeam Overall,theCPNPPPRAwasfoundtosubstantiallymeetthe ASMEPRAStandardatCapabilityCategoryIIandcanbeused to support riskinformed applications tosupportrisk informedapplications

PRA Model Scope and Quality PRAModelScopeandQuality

• SubsequenttothePeerReview,Findingsand q

g Observationswereaddressedandincorporatedinto thecurrentRevision4Amodel All Not Met now Cat II or better All NotMet nowCatIIorbetter 4of7previousCatInowCatIIorbetter Remaining3withnoapplicationimpact All Findings were resolved and incorporated AllFindingswereresolvedandincorporated Allbutonesuggestionincorporated Onewasdeferredwithnoapplicationimpact All remaining SRs meet Cat II or better AllremainingSRsmeetCatIIorbetter

• ExternalEventsbasedonIPEEEandwillbe used for insights only usedforinsightsonly

PRAModel d

li ScopeandQuality Adequatelyaddressesasbuilt,asoperatedplant PlantspecificdataandplantspecificbestestimateTHaddresssuccess criteria criteria LossofOffsitePowermodelingisrobust Electricpowersystemsmodelingisrobust;AlternatePowerGeneratoris installedandmodeledinthePRA

/

l d li i

b d

h d l SBO/RCPSealLOCAmodelingisrobustandusestheWOG2000model withhightemperatureseals Convolution method used for LOOP recovery analyses ConvolutionmethodusedforLOOPrecoveryanalyses

Description of Risk Assessment DescriptionofRiskAssessment

• ApplicableGuidanceandCriteria pp

• Rev2ofRG1.174andRG1.200,andRev1ofRG1.177 Q

tit ti A

l f

I t l E t

d Fl d

• QuantitativeAnalysesforInternalEventsandFlood, LevelIandII

• QualitativeAnalysesforExternalEvents

• QualitativediscussioncombinedwithIPEEEriskinsightsfortheFire, HighWinds(Tornado),andSeismic(Margins)

• Supportedbydetailedwalkdownofplant

Discussion of Sensitivity Analyses DiscussionofSensitivityAnalyses

• Sensitivitystudiesareusedtoaddressuncertainties.

These studies will include but are not limited to:

Thesestudieswillincludebutarenotlimitedto:

- ReliabilityofcomponentsimportanttotheriskcontributionsoftheCT extension I

d d ti f XST1 CT

- IncreaseddurationofXST1CT

- LOOPWeatherandPlantCenteredfrequencies

- Deferredmaintenance

• UncertaintyanalysiswillbeperformedperNUREG 1855.

855.

- CommonCauseFailurediscussion

Configuration Risk Management Program ConfigurationRiskManagementProgram

• CPNPPhasaConfigurationRiskManagementProgram

- IncorporatesthecharacteristicsofthemodelConfigurationRisk ManagementProgramdescribedinRG1.177

- CRMPdescriptionhasbeenincorporatedintoplantTechnical Specifications - 5 5 18 Specifications 5.5.18

- Previouslyapprovedforonetime14daychangetoTechnical SpecificationsforACSources-Operating-B3.8.1RequiredAction A.3(XST2Atransformerinstallation) f h l

• CRMPisarequirementoftheMaintenanceRuleProgram.

CPNPPendorsestheguidanceinNUMARC9301,Industry GuidelineForMonitoringtheEffectivenessOfMaintenanceAt Nuclear Power Plants NuclearPowerPlants

• CPNPPwillmeetthefire(a)(4)requirementbyDecember1, 2013

ConfigurationRiskManagementProgram-Risk Mitigation Actions RiskMitigationActions

[ImplementedduringtheextendedCTs]

1.

RestrictedAccesstoandSuspensionofMaintenanceintheSwitchyard.

2.

TestingofDieselGenerators(EDGandAPG)andTurbineDrivenAuxiliary FeedwaterPumpswithintheTwo(2)WeeksPriortotheStartoftheXST1 extendedCT.

3.

ReschedulingofTestingandMaintenanceontheEDGs,APGs,TDAFWPs, XST2,CCWPsandSSWPstooccuroutsidetheextendedCTwindow.

4.

SuspensionofHotWorkActivitiesNearXST2PowerandControlCabling.

l h

l h

f d

l bl 5.

RovingHourlyFireWatchAlongPathsofXST2PowerandControlCabling.

6.

SelectionofTimeofYearDuetoWeatherConsiderations.

7.

OperationspreparationsandgridmonitoringduringtheCT.

PreliminaryConclusionsofRisk Assessment

• BaseduponpreviousLARsubmittalandthe current update to the PRA model the currentupdatetothePRAmodel,the preliminaryPRAresultsshowthatthe extension of the XST1 CT will have minimal extensionoftheXST1CTwillhaveminimal impactonplantrisk

Proposed Schedule Proposed Schedule Luminant Power requests approval of the proposed License Amendment by September 30, 2013, to be implemented within 120 days of the issuance of the license implemented within 120 days of the issuance of the license amendment.

Questions? Feedback?

Questions?Feedback?