ML18142A469
| ML18142A469 | |
| Person / Time | |
|---|---|
| Issue date: | 05/22/2018 |
| From: | NRC/RES/DE/CMB |
| To: | |
| Rezai A, NRR-DMLR 415-1328 | |
| References | |
| Download: ML18142A469 (10) | |
Text
StatusofRegulatoryResearch MaterialsDegradation Industry/NRCMaterialsPrograms TechnicalInformationExchange May23,2018 Corrosion&MetallurgyBranch DivisionofEngineering OfficeofNuclearRegulatoryResearch
Materials Degradation Research
- PointsofContact
- Istvan (Steve)Frankl,BranchChief,Corrosion&MetallurgyBranch
- RobertTregoning,SeniorLevelAdvisor
- OverviewonStatusofKeyResearchAreas:
- LongtermMaterialsDegradation
- PrimaryWaterStressCorrosionCracking
- IrradiationAssistedDegradation
- ExPlantMaterialsHarvesting 2
12
Long-Term Materials Degradation Overview
- Objective:Coordinateconfirmatoryresearchprogramstoaddresstechnical issuesandknowledgegapsforextendedreactoroperationto80years
- Driver:Supporttechnicalbasestomakeregulatorydecisionsonapplications forsubsequentlicenserenewal(SLR)
- Applications:
SLRguidancedocuments(GALLSLR,SRPSLR)
ConfirmatoryreviewofSLRapplications
- Collaboration:DOE,EPRI,internationalcounterparts Ongoingactivities
- 4keytechnicalissues:1) RPVembrittlementathighfluence;2)IADofRPV internals;2)concreteandcontainmentdegradation,and 4)electricalcable qualificationandconditionassessment
- CoordinationwithDOEandindustrycounterparts
- Coordinationwithinternationalcounterpartsthroughmultilateralworking groups
- Developingaproactivestrategytoevaluatematerialharvesting opportunitiestosupportmaterialsagingresearch
LTMD Accomplishments and Path Forward
- Accomplishments
- NRCpublishedagingmanagementguidancedocumentswithsignificantRES contributions:NUREG2191(GALLSLR),NUREG2192(SRPSLR)
- SoontobepublishedrevisedguidanceonfatiguelifeinLWRs:
NUREG/CR6909,Rev.1andassociatedRG1.207,Rev.1
- PathForwardforRES/DEActivities
- NearTerm:
- EvaluateneedtoreviseRegulatoryGuide1.99onRPVembrittlement
- SupportNRRwithconfirmatoryreviewsofplantspecificanalysesofRPVinternals andpossibleconcretedegradationforthefirstSLRapplications
- TestCGRofconcretesusceptibletoalkalisilicareaction(ASR)
- Beginradiationandthermalagingofrepresentativeelectricalcables
- LongTerm:
- ContinuetotrendRPVpropertiesthroughperiodofextendedoperation
- ContinuetoassesspropertiesofRPVinternalsmaterialsatmediumandhigh fluence throughfurtherirradiationofexplantmaterials
- Determineneedforlongtermirradiationofconcretespecimens
- Assesscableconditionmonitoringtechniques
Primary Water Stress Corrosion Cracking (PWSCC)
- Overview
- Objective:EvaluatetheeffectsofcorrosionandaginginLWRenvironmentson theperformanceofprimarysystempiping,reactorpressurevessel(RPV)and RPVheadpenetrations
- Driver:Reactorcoolantpressureboundaryleakageandcomponentintegrity
- Applications:
- PWSCCcrackgrowthrate(CGR)dispositioncurvesandxLPR Coderesults informregulatorydecisionsoninspectionrequirements
- Collaboration:EPRI,ANL,PNNL
- Ongoingactivities
- PWSCCinitiationandCGRtesting
- PWSCCinitiationtestingisarecentlystartedcooperativeeffort
- EvaluationofindustrydevelopedCGRreferencecurves
PWSCC Accomplishments and Path Forward
- Accomplishments
- EstablishedPWSCCinitiationtestingcapability atPNNL
- Advancedthestateofartthroughautomationand theoptimizationofadvancedcrackdetectiontechnology
- ObtainedPWSCCCGRdataatANLandPNNLto supportregulatorydecisionmakingforinspection intervalsandprovidedbasistosupportwidespreaduseofAlloy690inthefleet
- PathForward
- Nearterm:
- ProvidePWSCCinitiationdatatosupportV&VandregulatoryreviewofthexLPR Code.
- ContinuetheCGRtestingprogramthroughearly2019
- Longterm:ContinuetoprovidePWSCCinitiationdatato:
- Informregulatorydecisionsregardinginspectionintervalsforreplacementparts, stressmitigatedparts,weldrepairsandnewreactorcomponents.
- Provideadditionaldataforfutureprobabilisticanalyses
Irradiation-Assisted Degradation
- Overview
- Objective:EvaluatetheeffectsofirradiationandLWRenvironmentonthe performanceofreactorpressurevessel(RPV)internals
- Applications:
- RegulatoryguidanceandreviewsfortheagingmanagementofRPVinternals
- Collaboration:EPRI,Halden,InternationalRegulators
- OngoingactivitiesforIrradiationAssistedDegradation(IAD)
- CGRandfracturetoughnesstestingofirradiatedexplantplateandweldmaterials
- EvaluationofindustrydevelopedCGRreferencecurvesforirradiationassisted stresscorrosioncracking(IASCC)ofstainlesssteels
- Accomplishments
- EffectivelyleveragedpartnershipswithEPRIandinternationalresearchersto conducthighpriorityirradiatedmaterialstestingonhighfluence stainlesssteel materialsharvestedfromZorita
IAD Path Forward
- FinalresultsoncooperativeZoritabaffleplateandweld materialstestingexpectedin2018and2019
- ConfirmatorytestingofZoritabaffleplateandweldmaterials atANLunderway
- FurtherirradiationofZoritaweldstohigherfluenceat Haldenexpectedtoprovideadditionaldatathrough2023
- RecentnewsofHalden shutdownwilldelaytheseplans
- ContinuetechnicalsupportonIASCCCGRreferencecurves,
thereviewofMRP227,Rev.1,etc.
Ex-Plant Materials Harvesting
- Overview
- Objective:Prioritizetechnicalneedsbestaddressedbyharvestingand identifybestvalueharvestingopportunities
- Driver:Supporttechnicalbasestomakeregulatorydecisionsfor materialsdegradationduringlongtermoperation
- Ongoingactivities
- ReportfromPNNLidentifiespotentialcriteriaforprioritizing harvestingneedsandprovidessomehistoryandlessonslearnedfrom pastharvestingefforts
- Focusedonmainissuesformaterialsdegradationduringlongtermoperation:
RPV,internals,concrete,electrical
- NRCstaffperforminginternalprioritizationofissuesbestaddressedby harvesting
- NRCstaffcompilinginformationonavailablematerials:
- Previouslyharvestedfrompriorprograms
- Fromdecommissioningplants
Harvesting Accomplishments and Path Forward
- Accomplishments
- WorkshopheldinMarch2017withDOE,EPRI,industryandinternational stakeholders
- PNNLreportnearcompletion
- PathForward
- UsecriteriatoidentifyNRCprioritiesforharvesting
- Reviewavailablematerialsfromallsourcesandcomparetoidentified priorities
- Seekcooperationandleveragingfromotherinterestedorganizationsto implementbestvalueopportunitiesforharvesting
- Continuallyreassessprioritiesandavailablematerialsbasedonlatest information