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{{#Wiki_filter:Status of Regulatory Research Materials Degradation Industry/NRC Materials Programs Technical Information Exchange May 23, 2018 Corrosion & Metallurgy Branch Division of Engineering Office of Nuclear Regulatory Research
{{#Wiki_filter:StatusofRegulatoryResearch MaterialsDegradation Industry/NRCMaterialsPrograms TechnicalInformationExchange May23,2018 Corrosion&MetallurgyBranch DivisionofEngineering OfficeofNuclearRegulatoryResearch


Materials Degradation Research
Materials Degradation Research
* Points of Contact
* PointsofContact
      - Istvan (Steve) Frankl, Branch Chief, Corrosion & Metallurgy Branch
- Istvan (Steve)Frankl,BranchChief,Corrosion&MetallurgyBranch
      - Robert Tregoning, Senior Level Advisor
- RobertTregoning,SeniorLevelAdvisor
* Overview on Status of Key Research Areas:
* OverviewonStatusofKeyResearchAreas:
      - Longterm Materials Degradation
- LongtermMaterialsDegradation
      - Primary Water Stress Corrosion Cracking
- PrimaryWaterStressCorrosionCracking
      - IrradiationAssisted Degradation
- IrradiationAssistedDegradation
      - ExPlant Materials Harvesting 2
- ExPlantMaterialsHarvesting 2
12
12


Long-Term Materials Degradation
Long-Term Materials Degradation Overview
* Overview
- Objective:Coordinateconfirmatoryresearchprogramstoaddresstechnical issuesandknowledgegapsforextendedreactoroperationto80years
  - Objective: Coordinate confirmatory research programs to address technical issues and knowledge gaps for extended reactor operation to 80 years
- Driver:Supporttechnicalbasestomakeregulatorydecisionsonapplications forsubsequentlicenserenewal(SLR)
  - Driver: Support technical bases to make regulatory decisions on applications for subsequent license renewal (SLR)
- Applications:
  - Applications:
SLRguidancedocuments(GALLSLR,SRPSLR)
* SLR guidance documents (GALLSLR, SRPSLR)
ConfirmatoryreviewofSLRapplications
* Confirmatory review of SLR applications
- Collaboration:DOE,EPRI,internationalcounterparts Ongoingactivities
  - Collaboration: DOE, EPRI, international counterparts
- 4keytechnicalissues:1) RPVembrittlementathighfluence;2)IADofRPV internals;2)concreteandcontainmentdegradation,and 4)electricalcable qualificationandconditionassessment
* Ongoing activities
- CoordinationwithDOEandindustrycounterparts
  - 4 key technical issues: 1) RPV embrittlement at high fluence; 2) IAD of RPV internals; 2) concrete and containment degradation, and 4) electrical cable qualification and condition assessment
- Coordinationwithinternationalcounterpartsthroughmultilateralworking groups
  - Coordination with DOE and industry counterparts
- Developingaproactivestrategytoevaluatematerialharvesting opportunitiestosupportmaterialsagingresearch
  - Coordination with international counterparts through multilateral working groups
  - Developing a proactive strategy to evaluate material harvesting opportunities to support materials aging research


LTMD Accomplishments and Path Forward
LTMD Accomplishments and Path Forward
* Accomplishments
* Accomplishments
  - NRC published aging management guidance documents with significant RES contributions: NUREG2191 (GALLSLR), NUREG2192 (SRPSLR)
- NRCpublishedagingmanagementguidancedocumentswithsignificantRES contributions:NUREG2191(GALLSLR),NUREG2192(SRPSLR)
  - Soon to be published revised guidance on fatigue life in LWRs:
- SoontobepublishedrevisedguidanceonfatiguelifeinLWRs:
NUREG/CR6909, Rev. 1 and associated RG 1.207, Rev. 1
NUREG/CR6909,Rev.1andassociatedRG1.207,Rev.1
* Path Forward for RES/DE Activities
* PathForwardforRES/DEActivities
  - Near Term:
- NearTerm:
* Evaluate need to revise Regulatory Guide 1.99 on RPV embrittlement
* EvaluateneedtoreviseRegulatoryGuide1.99onRPVembrittlement
* Support NRR with confirmatory reviews of plantspecific analyses of RPV internals and possible concrete degradation for the first SLR applications
* SupportNRRwithconfirmatoryreviewsofplantspecificanalysesofRPVinternals andpossibleconcretedegradationforthefirstSLRapplications
* Test CGR of concrete susceptible to alkalisilica reaction (ASR)
* TestCGRofconcretesusceptibletoalkalisilicareaction(ASR)
* Begin radiation and thermal aging of representative electrical cables
* Beginradiationandthermalagingofrepresentativeelectricalcables
  - Long Term:
- LongTerm:
* Continue to trend RPV properties through period of extended operation
* ContinuetotrendRPVpropertiesthroughperiodofextendedoperation
* Continue to assess properties of RPV internals materials at medium and high fluence through further irradiation of explant materials
* ContinuetoassesspropertiesofRPVinternalsmaterialsatmediumandhigh fluence throughfurtherirradiationofexplantmaterials
* Determine need for longterm irradiation of concrete specimens
* Determineneedforlongtermirradiationofconcretespecimens
* Assess cable condition monitoring techniques
* Assesscableconditionmonitoringtechniques


Primary Water Stress Corrosion Cracking (PWSCC)
Primary Water Stress Corrosion Cracking (PWSCC)
* Overview
* Overview
  - Objective: Evaluate the effects of corrosion and aging in LWR environments on the performance of primary system piping, reactor pressure vessel (RPV) and RPV head penetrations
- Objective:EvaluatetheeffectsofcorrosionandaginginLWRenvironmentson theperformanceofprimarysystempiping,reactorpressurevessel(RPV)and RPVheadpenetrations
  - Driver: Reactor coolant pressure boundary leakage and component integrity
- Driver:Reactorcoolantpressureboundaryleakageandcomponentintegrity
  - Applications:
- Applications:
* PWSCC crack growth rate (CGR) disposition curves and xLPR Code results inform regulatory decisions on inspection requirements
* PWSCCcrackgrowthrate(CGR)dispositioncurvesandxLPR Coderesults informregulatorydecisionsoninspectionrequirements
  - Collaboration: EPRI, ANL, PNNL
- Collaboration:EPRI,ANL,PNNL
* Ongoing activities
* Ongoingactivities
  - PWSCC initiation and CGR testing
- PWSCCinitiationandCGRtesting
* PWSCC initiation testing is a recentlystarted cooperative effort
* PWSCCinitiationtestingisarecentlystartedcooperativeeffort
  - Evaluation of industrydeveloped CGR reference curves
- EvaluationofindustrydevelopedCGRreferencecurves


PWSCC Accomplishments and Path Forward
PWSCC Accomplishments and Path Forward
* Accomplishments
* Accomplishments
  - Established PWSCC initiation testing capability at PNNL
- EstablishedPWSCCinitiationtestingcapability atPNNL
* Advanced the stateofart through automation and the optimization of advanced crack detection technology
* Advancedthestateofartthroughautomationand theoptimizationofadvancedcrackdetectiontechnology
  - Obtained PWSCC CGR data at ANL and PNNL to support regulatory decision making for inspection intervals and provided basis to support widespread use of Alloy 690 in the fleet
- ObtainedPWSCCCGRdataatANLandPNNLto supportregulatorydecisionmakingforinspection intervalsandprovidedbasistosupportwidespreaduseofAlloy690inthefleet
* Path Forward
* PathForward
  - Near term:
- Nearterm:
* Provide PWSCC initiation data to support V&V and regulatory review of the xLPR Code.
* ProvidePWSCCinitiationdatatosupportV&VandregulatoryreviewofthexLPR Code.
* Continue the CGR testing program through early 2019
* ContinuetheCGRtestingprogramthroughearly2019
  - Long term: Continue to provide PWSCC initiation data to:
- Longterm:ContinuetoprovidePWSCCinitiationdatato:
* Inform regulatory decisions regarding inspection intervals for replacement parts, stressmitigated parts, weld repairs and new reactor components.
* Informregulatorydecisionsregardinginspectionintervalsforreplacementparts, stressmitigatedparts,weldrepairsandnewreactorcomponents.
* Provide additional data for future probabilistic analyses
* Provideadditionaldataforfutureprobabilisticanalyses


Irradiation-Assisted Degradation
Irradiation-Assisted Degradation
* Overview
* Overview
  - Objective: Evaluate the effects of irradiation and LWR environment on the performance of reactor pressure vessel (RPV) internals
- Objective:EvaluatetheeffectsofirradiationandLWRenvironmentonthe performanceofreactorpressurevessel(RPV)internals
  - Applications:
- Applications:
* Regulatory guidance and reviews for the aging management of RPV internals
* RegulatoryguidanceandreviewsfortheagingmanagementofRPVinternals
  - Collaboration: EPRI, Halden, International Regulators
- Collaboration:EPRI,Halden,InternationalRegulators
* Ongoing activities for Irradiation Assisted Degradation (IAD)
* OngoingactivitiesforIrradiationAssistedDegradation(IAD)
  - CGR and fracture toughness testing of irradiated explant plate and weld materials
- CGRandfracturetoughnesstestingofirradiatedexplantplateandweldmaterials
  - Evaluation of industrydeveloped CGR reference curves for irradiationassisted stress corrosion cracking (IASCC) of stainless steels
- EvaluationofindustrydevelopedCGRreferencecurvesforirradiationassisted stresscorrosioncracking(IASCC)ofstainlesssteels
* Accomplishments
* Accomplishments
  - Effectively leveraged partnerships with EPRI and international researchers to conduct highpriority irradiated materials testing on high fluence stainless steel materials harvested from Zorita
- EffectivelyleveragedpartnershipswithEPRIandinternationalresearchersto conducthighpriorityirradiatedmaterialstestingonhighfluence stainlesssteel materialsharvestedfromZorita


IAD Path Forward
IAD Path Forward
* Final results on cooperative Zorita baffle plate and weld materials testing expected in 2018 and 2019
* FinalresultsoncooperativeZoritabaffleplateandweld materialstestingexpectedin2018and2019
* Confirmatory testing of Zorita baffle plate and weld materials at ANL underway
* ConfirmatorytestingofZoritabaffleplateandweldmaterials atANLunderway
* Further irradiation of Zorita welds to higher fluence at Halden expected to provide additional data through 2023
* FurtherirradiationofZoritaweldstohigherfluenceat Haldenexpectedtoprovideadditionaldatathrough2023
  - Recent news of Halden shutdown will delay these plans
- RecentnewsofHalden shutdownwilldelaytheseplans
* Continue technical support on IASCC CGR reference curves ,
* ContinuetechnicalsupportonIASCCCGRreferencecurves,
the review of MRP227, Rev.1, etc.
thereviewofMRP227,Rev.1,etc.


Ex-Plant Materials Harvesting
Ex-Plant Materials Harvesting
* Overview
* Overview
  - Objective: Prioritize technical needs best addressed by harvesting and identify best value harvesting opportunities
- Objective:Prioritizetechnicalneedsbestaddressedbyharvestingand identifybestvalueharvestingopportunities
  - Driver: Support technical bases to make regulatory decisions for materials degradation during longterm operation
- Driver:Supporttechnicalbasestomakeregulatorydecisionsfor materialsdegradationduringlongtermoperation
* Ongoing activities
* Ongoingactivities
  - Report from PNNL identifies potential criteria for prioritizing harvesting needs and provides some history and lessons learned from past harvesting efforts
- ReportfromPNNLidentifiespotentialcriteriaforprioritizing harvestingneedsandprovidessomehistoryandlessonslearnedfrom pastharvestingefforts
* Focused on main issues for materials degradation during longterm operation:
* Focusedonmainissuesformaterialsdegradationduringlongtermoperation:
RPV, internals, concrete, electrical
RPV,internals,concrete,electrical
  - NRC staff performing internal prioritization of issues best addressed by harvesting
- NRCstaffperforminginternalprioritizationofissuesbestaddressedby harvesting
  - NRC staff compiling information on available materials:
- NRCstaffcompilinginformationonavailablematerials:
* Previously harvested from prior programs
* Previouslyharvestedfrompriorprograms
* From decommissioning plants
* Fromdecommissioningplants


Harvesting Accomplishments and Path Forward
Harvesting Accomplishments and Path Forward
* Accomplishments
* Accomplishments
  - Workshop held in March 2017 with DOE, EPRI, industry and international stakeholders
- WorkshopheldinMarch2017withDOE,EPRI,industryandinternational stakeholders
  - PNNL report near completion
- PNNLreportnearcompletion
* Path Forward
* PathForward
  - Use criteria to identify NRC priorities for harvesting
- UsecriteriatoidentifyNRCprioritiesforharvesting
  - Review available materials from all sources and compare to identified priorities
- Reviewavailablematerialsfromallsourcesandcomparetoidentified priorities
  - Seek cooperation and leveraging from other interested organizations to implement best value opportunities for harvesting
- Seekcooperationandleveragingfromotherinterestedorganizationsto implementbestvalueopportunitiesforharvesting
  - Continually reassess priorities and available materials based on latest information}}
- Continuallyreassessprioritiesandavailablematerialsbasedonlatest information}}

Latest revision as of 20:48, 5 January 2025

23 - NRC Materials Degradation Research - Cmb
ML18142A469
Person / Time
Issue date: 05/22/2018
From:
NRC/RES/DE/CMB
To:
Rezai A, NRR-DMLR 415-1328
References
Download: ML18142A469 (10)
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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

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