ML13023A412
| ML13023A412 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 01/23/2013 |
| From: | Tennessee Valley Authority |
| To: | Plant Licensing Branch II |
| Hon, Andy | |
| Shared Package | |
| ML13023A417 | List: |
| References | |
| Download: ML13023A412 (22) | |
Text
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WattsBarTPBARLoadingIncreaseLAR PreSubmittalMeeting Nuclear g
January23,2013
Agenda N
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- Introduction TerryCribbe
- Background MarkBurzynski
- DOE TPBAR Loading Plans Curtis Chambellan
- DOE TPBARLoadingPlans CurtisChambellan
- TritiumPermeationExperience LarryBagaasen
- ProjectedPathwayExposures MarkBurzynski j
y p
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- PlantModifications JeffMcGuire
- LicensingActivities MarkBurzynski
- PostLOCA ShutdownMarginAnalysis GreggSwindlehurst
- LicensingActivitiesSchedule TerryCribbe 2
- ClosingComments TerryCribbe
Introduction N
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- PurposeofMeeting
- UpdateNRCManagementonTVAsPlantoSubmita LicenseAmendmentRequest(LAR)inJune2013to q
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IncreaseAllowableTPBARLoadingforWattsBar Unit1 3
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Background===
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- Background
- LicenseAmendment40IssuedonSeptember23,2002 AuthorizedLoadingUpto2304TPBARs
- Allowed Loading Subsequently Reduced to Address Post
- AllowedLoadingSubsequentlyReducedtoAddressPost LOCAShutdownMarginIssues
- TVALetterDatedMarch22,2005NotifiedNRCofInterim CumulativeTPBARTritiumReleaseLimits
- WhileHigherthanProjectedPermeationRateswere Investigated Investigated
- LicenseAmendment77IssuedonMay4,2009Authorized LoadingUpto704TPBARs 4
DOE TPBARLoadingPlans N
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- DOE TPBARLoadingPlansforWattsBarUnit1:
Cycle Date TPBARLoading TechSpecLimit C11 April 2011 544 704 C11 April2011 544 704 C12 October2012 544 704 C13 April2014 544704 704 C14 October2015 11041024 1696*
C15 April2017 15041424 1696*
C16 October2018 1696 1696*
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- Proposed
TritiumPermeation Experience (1/2)
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Experience(1/2)
Nuclear TVAandPNNLPerformedSurveillanceOfEstimatedTritium PermeationOverLast6CyclesofTPBARIrradiationfortheTritium y
ReadinessProgram.
- PermeationWasHigherthanOriginalDesignGoal,ButNoDesignorProduction FlawsHaveBeenIdentified.
U t i t b Uncertaintybars represent90%
confidenceinterval 6
TritiumPermeation Experience (2/2)
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Experience(2/2)
Nuclear OriginalFunctionalRequirementforTPBARTritiumPermeationinCycle6wasan Averageof1Ci/TPBAR/Year.
RadionuclideReleasestoEnvironmentatWBN1willbeManagedtoMeetNRC Requirementsin10CFRPart20and10CFRPart50AppendixI.
- ProposedManagementStrategyAssumesTPBARTritiumPermeationwillbe5.0 Ci/TPBAR/year Ci/TPBAR/year.
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- Projected
ProjectedPathwayExposure(1/2)
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- FSARChapter11RadiologicalConsequence AnalysesWillBeBasedon:
- ReleaseSourceTermBasedonNRCNUREG0017 MethodologytoCalculateanAverageMaximumHypothetical Release
- TPBAR Loading of 1700 TPBARs TPBARLoadingof1700TPBARs
- TPBARTritiumPermeationRateof5Curies/TPBAR/Year (BasedonConservativeUpperBoundofPlantData)
- UseofTVAQAComputerCodesGELC andQWATA to CalculateDosetoMaximumExposedOffsiteIndividual 8
ProjectedPathwayExposure(2/2)
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- ProjectedPathwayExposurestoMaximum Hypothetical Individual Remain Below NRC Regulatory HypotheticalIndividualRemainBelowNRCRegulatory LimitsforAllCases.
Pathways PreliminaryProjected Doses Liquid(Realistic) 0.75mrem TotalBody Liquid(Design) 0.81mrem TotalBody 1 29 mrem Total Body Gaseous(Realistic) 1.29mrem TotalBody 10.86mrem CriticalOrgan Gaseous(Design) 1.29mrem TotalBody
- ApplicableNRCRequirements(10CFR Part20and10 CFR P t 50 A di I) d T h i l S ifi ti Gaseous ( es g )
11.34mrem CriticalOrgan 9
CFR Part50AppendixI)andTechnicalSpecifications WillBeMetforAllCases.
PlantModifications(1/2)
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- Additionof500,000GallonTritiated WaterTank System
- IncreaseFlexibilitytoManageRCS FeedandBleed UnderContingencyScenariosandTimeEffluent ReleasestoEnvironment
- AllowsChangestoOperatingStrategyforRCS Feed andBleedtoKeepTritiumConcentrationsLowand Simplify Occupational Exposure Controls SimplifyOccupationalExposureControls
- Implementedunder10CFR 50.59 10
PlantModifications(2/2)
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- ReplaceCheckValvesUsedforThermalReliefon ERCW SupplyLineswithreliefValves
- EliminatesPostLOCAManualOperatorActionsfor IsolationPreviouslyApprovedbyNRCinLicense AmendmentIssuedonMarch29,2004
- Eliminates40GPM SourceofUnboratedWater LeakageintoContainment(Assumedfor16Hours)
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10 CFR 50 59
- Implementedunder10CFR 50.59 11
LicensingActivities N
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- UpdateLetterRemovingInterimLimitonTritium Releases Attributed to TPBARs (Update to March ReleasesAttributedtoTPBARs(UpdatetoMarch 22,2005Letter)
- ReturntoNormalEffluentControlsof10CFR Part20, 0
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10 CFR Part50AppendixI,andTechnicalSpecifications
- WouldIncludeGeneralDiscussionofExpectedEffluent Releasesfor704TPBARs
- LicenseAmendmentRequestfor1696TPBARs
- UpdateofPostLOCA ReactivityAnalysisPreviously Approved by NRC for License Amendment 77 ApprovedbyNRCforLicenseAmendment77
- WouldIncludeDiscussionofExpectedEffluentReleases (UsingRealisticSourceTerm)andRadwasteSystem D
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(U i D
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i S 12 DesignandStationDose(UsingDesignBasisSource Term)for1696TPBARs
PostLOCAShutdown Margin Analysis (1/5)
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MarginAnalysis(1/5)
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- PostLOCAReactivityAnalysiswillBeConsistent ith P i
l A d b NRC f Li withPreviouslyApprovedbyNRCforLicense Amendment77withtheFollowingKeyChanges:
- Elimination of Dilution of Sump Water from 40 GPM EliminationofDilutionofSumpWaterfrom40GPM UnboratedWaterInLeakage
- ReduceRequiredRCS BoronConcentrationbyIncreased IFBA Loading
- ModificationofSimplifiedAssumptionsonTPBAR Lithium Leaching at Time of Hot Leg Switchover LithiumLeachingatTimeofHotLegSwitchover.
- TimeDependentLeachingRateUsed
- PreliminaryResultsShowSufficientShutdown 13 y
Marginfor1696TPBARs
PostLOCAShutdown Margin Analysis (2/5)
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MarginAnalysis(2/5)
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- XenonFreePostLOCA-RSACItem3.16B PreLOCACb (ppm)
PostLOCACb (ppm)
Limit (ppm)
Margin (ppm)
HFP EQXECb =1200ppm (lessIFBA) 544TPBARs 937 1891 2176 285 1696TPBARs 953 2170 2178 8
HFPEQXECb =900ppm (moreIFBA) 1696 TPBAR
Conclusion:
900ppm corewith1696TPBARscan 1696TPBARs 736 2006 2148 142 14 pp accommodatecyclevariations PreliminaryResults
PostLOCAShutdown Margin Analysis (3/5)
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MarginAnalysis(3/5)
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- HotLegSwitchover-RSACItem3.16A g
PreLOCACb (ppm)
PostLOCACb (ppm)
Limit (ppm)
Margin (ppm)
HFP EQXE Cb = 1200 ppm (less IFBA)
HFPEQXECb =1200ppm (lessIFBA) 544TPBARs 937 1891 2009 118 1696 TPBARs 953 2170 2012 158 HFPEQXECb =900ppm (moreIFBA) 1696TPBARs -
50%Leach(Max) 736 2006 1966 40 1696 TPBAR
Conclusion:
1696 TPBAR core at 900 ppm with 1696TPBARs -
3%Leach(Time Dependent) 736 1897 1966 69 15
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Conclusion:==
1696TPBARcoreat900ppm with timedependentleachratemeetsrequirements.
PreliminaryResults
PostLOCAShutdown Margin Analysis (4/5)
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MarginAnalysis(4/5)
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- ColdLegRecirculation-RSACItem3.11B g
PreLOCACb (ppm)
PostLOCACb (ppm)
Limit (ppm)
Margin (ppm)
HFPEQXECb =1200ppm (lessIFBA) 544TPBARs 937 1891 2115 224 1696TPBARs 953 2170 2119 52 HFPEQXECb =900ppm (moreIFBA)
Conclusion:
1696TPBARs,900ppm coremeets 1696TPBAR 735 2006 2064 58 16 pp requirements.
PreliminaryResults
PostLOCAShutdown Margin Analysis (5/5)
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MarginAnalysis(5/5)
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- RefloodRecriticality-RSACItem3.11C P
LOCA C L
LBLOCA I t di t S
ll LBLOCA PreLOCACb (ppm)
LargeLBLOCA (Keff)
SmallLBLOCA (Keff)
HFP EQXE C = 1200 ppm (less IFBA)
HFPEQXECb =1200ppm (lessIFBA) 544TPBARs 937 0.939349 0.968402 0.982261 1696TPBARs 953 0.964008 0.990343 1.007126 HFP EQXECb =900ppm (moreIFBA) 1696TPBARs -
50%Leach(Max) 736 0.955894 0.985144 1.005015
Conclusion:
1696 TPBAR core at 900 ppm with time 1696TPBARs-3%Leach(Time Dependent) 736 0.948534 0.977298 0.996649 17
Conclusion:
1696TPBARcoreat900ppm withtime dependentleachratemeetsrequirements.
PreliminaryResults
LicensingActivitiesSchedule N
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Closing N
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- TVAWillSubmitaLicenseAmendmentRequest f
1696 TPBAR i J 2013 for1696TPBARsinJune2013
- SupportingAnalyseswillBoundOperating E
i i h T i i P
i ExperiencewithTritiumPermeation
- SupportingAnalyseswillReflectPlantModifications M d t I M
i MadetoIncreaseMargins
- AllRegulatoryRequirementsandPlantTechnical Specifications will be met with 1696 TPBAR Core Specificationswillbemetwith1696TPBARCore Design 19
Questions N
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Backup Slides N
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TPBARLeachingTest LeachingResultsfromDynamicLeachingTestonan Nuclear g
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IrradiatedTPBARSection
HotLeg Switchover 1