meeting between the u.s. nuclear rlt c iistffdthregulatory ...rlt c iistffdthregulatory commission...

Meeting Between the U.S. Nuclear R l t C i i St ff d thRegulatory Commission Staff and the Nuclear Energy Institute to Discuss

Current License Renewal Topics

December 4, 2014

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Action Items

A NRC d NEI ill ti th i di iA. NRC and NEI will continue their discussion on industry’s two draft guideline documents on operating experience and AMP effectiveness self-assessment. p

B. NEI and EPRI will work with the NRC on a case by case basis to review requests for certaincase-by-case basis to review requests for certain portions of EPRI documents to be made publically available to support the SLR expert panels. Also as an ongoing effort EPRI will be revising documents to address operations from 60 to 80 years.

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Action Items cont.

C. NRC to provide schedule updates to GALL-SLR and SRP-SLR.

D. NRC and NEI will consider having a separate meeting on the draft Selective Leaching AMP after the NEI Mechanical Working Group Review releases the document to the NRC.

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NRC’s CABLE AGING RESEARCH ACTIVITIES

Darrell Murdock Division of EngineeringDivision of Engineering

Office of Nuclear Regulatory Research

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OUTLINE

EVALUATION OF CABLE DEGRADATION IN A EVALUATION OF CABLE DEGRADATION IN A SUBMERGED ENVIRONMENT

ASSESSMENT OF CONDITION MONITORING METHODS OF ELECTRICAL CABLES

INTERNATIONAL RESEARCH COOPERATION

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BACKGROUND Generic Letter 2007-01

o 269 Records Of Cable Failureo 269 Records Of Cable Failure NRC Starts a Research Project Called “Essential Elements

Of An Electric Cable Condition Monitoring Program”Commonly Used Condition Monitoring Techniqueso Commonly Used Condition Monitoring Techniques

o Elements That Constitute A Good CM Program In 2011 The NRC Issued

o NUREG 7000 “Essential Elements Of An Electric Cable Condition Monitoring Program”

o RG 1.218 “Condition Monitoring Techniques For Electric Cables Used In Nuclear Power Plants”

Condition Monitoring Techniques In RG 1.218 and NUREG 7000 Do Not Possess A Quantitative Predictive Capability Of Remaining Useful Life.

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EVALUATION OF CABLE DEGRADATION IN A SUBMERGED ENVIRONMENT

RESEARCH OVERVIEW

In 2013 RES Began The Project Called “Evaluation of Cable In 2013 RES Began The Project Called Evaluation of Cable Degradation In A Submerged Environment”.

Objective:o Develop A Predictive Model For Cables In A Submergedo Develop A Predictive Model For Cables In A Submerged

Environment The Project Was Divided Into Two Phases:

Fi t Pho First Phase:a)Perform A Literature Review Of Past Projects In The Realm

Of Submerged Cables.b)Provide Recommendations For Accelerating Aging Test

o Second Phase:a)Develop Test Plan) pb)Implement Accelerating Testing And Condition Monitoring

Techniques 7

EVALUATION OF CABLE DEGRADATION IN A SUBMERGED ENVIRONMENTENVIRONMENT

PHASE 1: LITERATURE SEARCH PRELIMINARY CONCLUSIONS

Fundamental Studies Are Needed To Systematically Understand Variables/Stressors.

Id tifi ti Of A C i t t E d f Lif (EOL) C it i I N d d Identification Of A Consistent End-of-Life (EOL) Criteria Is Needed Advances In Accelerated Aging Needed To:

o Understand Synergism Of The Stressors Advances In Condition Monitoring Required

o Track/Measure Proper Cable Parameter o Develop A Condition Monitoring Technique To Track Parametero Develop A Condition Monitoring Technique To Track Parameter

As The Cable Ages.

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PHASE II: INTERIM RESEARCH

Perform Fundamental Studies To Systematically Understand StressorsU d t d S i Of Th Sto Understand Synergism Of The Stressors

Determine A Consistent End-of-Life (EOL) Criteria

Condition Monitoringo Track/Measure Proper Cable Parameter o Develop A Condition Monitoring Technique To Track Parameter Aso Develop A Condition Monitoring Technique To Track Parameter As

The Cable Ages.

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PHASE III – ACCELERATED AGING PROTOCOL IMPLEMENTATION

Implement Developed Accelerated Aging Protocolp p g g

Develop Life Predictive Model

Validate Model With Field Samples

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PURPOSE:

Determine The Most Applicable Condition Monitoring Techniques For Specific Insulation Materials

Establish Reproducible And Consistent Condition Establish Reproducible And Consistent Condition Monitoring Techniques Under Nuclear Plant Conditions

Inform Service Life Predictions Models At Lower Temperatures.Temperatures.

CONTRACTOR & COLLABORATORS National Institute of Standards and Technology National Institute of Standards and Technology

o University of Maryland EPRI

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COMMONLY USED CONDITION MONITORING TECHNIQUES TO BE EVALUATED

Mechanical Condition Indicators: Elongation, Indenter Methods, Recovery Time

Dielectric Condition Indicators : Dielectric Condition Indicators :Insulation Resistance, Dielectric Loss, Time Domain Reflectometry, LIRA, Partial Discharge

Chemical Indicators :Oxidation Time/Temperature, Fourier Transform I f d S tInfrared Spectroscopy

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PHASE 1: ASSESSING CM TECHNIQUES DURING OPERATIONAL AGING

Cables Subject To Normal Operating Conditions (temperature, radiation, humidity)

Samples Will Be Subject To Accelerated Aging To Simulate Samples Will Be Subject To Accelerated Aging To Simulate 40, 60 Years

Selection Of Exposure Environments Is Based On Normal Plant ConditionsPlant Conditions

Temperature (C ) Relative Humidity (%)

30 2042 50

Radiation Exposure Will Be Done At A Rate Of 40 G/hr For A T t l O ti l A i R di ti D Of 50 MR d

42 5055 70

A Total Operational Aging Radiation Dose Of 50 MRad(500 kGy).

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PHASE 2: ASSESSING CM TECHNIQUES FOR CABLES SUBJECT TO ACCIDENT CONDITIONS

Cables Will Be Exposed To Accident Conditions Cables Will Be Exposed To Accident Conditions (temperature, pressure, humidity, radiation, chemical/steam spray)

Condition Monitoring Techniques Will Be Evaluated During And After The Accident Conditions.

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PROJECT CURRENT STATUS

Naturally Aged Cableso Hope To Get Additional Naturally Aged Cables From

Zion In The Springo Possibility Of Getting Cable Samples From Crystal

River

Construction Of Ageing Chamberso Aging Chambers Will Be Completed 01/15 By Theo Aging Chambers Will Be Completed 01/15 By The

University Of Marylando Aging Should Begin 02/15 For 18 Months

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INTERNATIONAL RESEARCH COLLABORATIONS

IAEA Coordinated Research ProjectAssemble A Group Of Experts From Around The Worldo Assemble A Group Of Experts From Around The World To Provide Input On Condition Monitoring, Aging ManagementEstablish A Benchmarking Program Whereby Cableo Establish A Benchmarking Program Whereby Cable Samples Are Tested By Various Methods And Results Compared To Identify The Best Testing Methods

OECD/NEA Cable Aging Data And Knowledge (CADAK)o Follow Up To The SCAP Projecto Final Report Expected Early 2015

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AGING MANAGEMENT OF LOSS OF COATING OR LINING INTEGRITY FORCOATING OR LINING INTEGRITY FOR

INTERNAL COATINGS/LININGS ON IN-SCOPE PIPING PIPING COMPONENTSIN-SCOPE PIPING, PIPING COMPONENTS,

HEAT EXCHANGERS AND TANKSLR-ISG-2013-01LR ISG 2013 01

William C HolstonDi i i f Li R lDivision of License Renewal

Aging Management of Reactor Systems Branch Staff

Scope & Parameters

• AMP XI M42 or alternative AMPsAMP XI.M42 or alternative AMPs

• Physical damage

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Detection of Aging Effects

• Periodic visual inspections

• Extent of inspections• Extent of inspections

• Alternatives to managing loss of coating integrity

• Training and qualifications

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Acceptance Criteria

• Peeling and delaminationPeeling and delamination

• Blisters

• Cracking, flaking, and rusting

• Cementitious coatings

• Wall thickness measurementsWall thickness measurements

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Corrective Actions

• Alternative for peeling and delaminationp g

• Base material examinations

• Blister testing

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GALL Report-SLRAMP XI M33 S l ti L hiAMP XI.M33 Selective Leaching

Staff Questions Related to Industry Proposed AMP XI.M33 Changes

William C HolstonDivision of License Renewal


Staff Questions

Scope of Programp g

• Treated & closed-cycle cooling water

Detection of Aging Effects

• Population – material versus material & environmentPopulation material versus material & environment

• Number of inspections at multi-unit sites

• Detecting selective leaching of gray cast iron

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Staff Questions, cont.

Acceptance Criteriap

• Next inspection period, or

• End of subsequent period of extended operation

Corrective ActionsCorrective Actions

• Additional inspections

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GALL Report-SLRAMP XI 17 Fl A l t dAMP XI.17 Flow-Accelerated

Corrosion Program

Jim GavulaDivision of License RenewalDivision of License Renewal


Background / Issue

• Susceptibility guidelines allow system exclusions

– Operation less than 2 percent of plantOperation less than 2 percent of plant operating time

• Guidance does not limit duration of exclusion

• Cumulative effect for 60 year operation notCumulative effect for 60 year operation not addressed

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Proposed Resolution

• Detection of Aging Effects revisionDetection of Aging Effects revision

– Re-assessment for any system previously excluded due to limited operating time

R b d ll hi k– Re-assessment based on wall thickness measurements to confirm exclusion validity

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GALL Report-SLRAMP XI 20 O C l C li W tAMP XI.20 Open-Cycle Cooling Water

System Program

Jim GavulaDivision of License RenewalDivision of License Renewal


Background / Issue

V if I t d d f ti f i t t• Verify Intended function of service water system– Flow tests for portions where system configuration

allowsallows– Portions without testable configuration rely on design

parameter verification

• Design parameters affect flow– inside diameter of pipeinside diameter of pipe– friction factor or roughness factor

I t l t b l ti d l ff t b th t

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• Internal tuberculation adversely affects both parameters

Fouling from Tubercles

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Service Water Tubercles

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Proposed Resolution

• Parameters Monitored or Inspected revision

– Intended functions of non-tested portions verified using changes to design parameters

– Tested portions of system provide basis for changes to design parametersg g p

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Use of the Expanded Materials Degradation Assessment (EMDA)

Reports for SLRp

B tt B dBennett BradyDivision of License Renewal

Subsequent Renewal, Guidance, and qOperations Branch Staff

EMDA

• In 2007, NRC published the Proactive Materials pDegradation Assessment (PMDA)– Looked at potential degradation modes for core internals

and piping for operation to 40 years

• In 2010, NRR asked RES to – Expand the PMDA to also look at concrete and civil

structures the reactor pressure vessel and electricalstructures, the reactor pressure vessel, and electrical cables and insulation

– Extend to operation from 60 to 80 years

• Expert panels ranked the degradation modes as to susceptibility and current knowledge– Five volumes published in October 2014p

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Use of EMDA Results in SLR T h i l PTechnical Process

• Goal:

– Prioritize the technical work of the expert panels developing the GALL-SLR and SRP-SLRp g

– Define new aging management review “line-items”1

that were not in GALL 2that were not in GALL 2

– Provide comments to RES and to better understand the experts’ rankingsthe experts rankings

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1 i.e., a component, material, environment, aging effect/mechanism, and aging program combination

Determining Top Priority AMPs for SLRAMPs for SLR

• Looked at EMDA t i l/ i t/d d ti dmaterial/environment/degradation modes

ranked as– High susceptibility low knowledgeHigh susceptibility, low knowledge– High susceptibility, high knowledge– Moderate susceptibility, low knowledge

• Mapped these line items to GALL 2 line items (except for electrical items)

• Tabulated the AMPs managing these degradation modesg

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Setting Priority of AMPs

• Used– AMP rankings from EMDA results– EPRI’s AMP Gap Analysis– Technical judgment of NRC staff– Technically challenging AMPs for GALL 2

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Most Significant AMPs for SLRXI.M9 BWR Vessel Internals

XI.M16A PWR Vessel Internals

XI.S6 Structures Monitoring

XI.S2 ASME Section XI, Subsection IWLXI.S2 ASME Section XI, Subsection IWL

XI.M31 Reactor Vessel Surveillance

XI.M32 One-Time InspectionXI.M32 One Time Inspection

XI.E1 Insulation Material for Electrical Cables and Connections Not Subject to 10 CFR 50.49 Environmental Qualification Requirements

XI.E2 Insulation Material for Electrical Cables and Connections Not S bj t t 10 CFR 50 49 E i t l Q lifi tiSubject to 10 CFR 50.49 Environmental Qualification Requirements Used in Instrumentation Circuits

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Most Significant AMPs for SLRMost Significant AMPs for SLRXI.M1 ASME Section XI, Inservice Inspection, Subsections IWB,

IWC and IWDIWC, and IWDXI.M35 One-time Inspection of ASME Code Class 1 Small bore piping

TLAA Concrete Containment Tendon PrestressX.S1XI.M33 Selective Leaching

XI M2 W t Ch i tXI.M2 Water Chemistry

XI.M11B Cracking of Nickel-Alloy Components and Loss of Material Due to Boric Acid-Induced Corrosion in Reactor CoolantDue to Boric Acid Induced Corrosion in Reactor Coolant Pressure Boundary Components (PWR only)

XI.M4 BWR Vessel ID Attachment WeldsXI M6 BWR Control Rod Drive Return Line NozzleXI.M6 BWR Control Rod Drive Return Line Nozzle

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Example Line Items and Aging M h i Add d t GALLMechanisms Added to GALL

• Added loss of material due to pitting and crevice corrosion to steel components exposed to air-

t ll duncontrolled

• Added microbiologically influenced corrosionAdded microbiologically influenced corrosion (MIC) and new line items for MIC

Add d BWR i k l ll CRD t li l• Added BWR nickel alloy CRD return line nozzle caps and welds, cracking due to stress corrosion cracking intergranular stress corrosion crackingcracking, intergranular stress corrosion cracking.

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Generic Aging Lessons Learned (GALL) Reportg g ( ) pand Standard Review Plan (SRP) Schedule

for Subsequent License Renewal (SLR)

B tt B dBennett BradyDivision of License Renewal

Subsequent Renewal, Guidance, and Operations Branch StaffBranch Staff

SLR Timeline

Draft GALL & SRP Public Meeting &

Develop GALL & SRP

Comments Disposition

First Application Submitted?

First SLR License Issued?

2014 2015 20182016 2017 2019 20212020

Final GALL &Draft GALLFirst Application

Review?Final GALL & SRP

Draft GALL & SRP for comments

Review?

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Schedule Milestones

Milestone DateCompletion of draft GALL & SRP August 2015Advisory Committee on Reactor Safeguards (ACRS) Subcommittee Meeting

October 2015Subcommittee MeetingIssue draft GALL & SRP for SLR December 2015Public Meeting – Draft GALL & SRP January 2016End of draft GALL & SRP Comment Period February 2016Public Comments Disposition May 2016Completion of final GALL & SRP December 2016Completion of final GALL & SRP December 2016ACRS Full-Committee February 2017Issue Final GALL, SRP and Technical Basis for SLR June 2017

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