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© 2017 Electric Power Research Institute, Inc. All rights reserved.

Andrew ManteySenior Technical Leader- EPRI

Regulatory Information ConferenceMarch 16, 2017

Cable Aging Management

2© 2017 Electric Power Research Institute, Inc. All rights reserved.

EPRI Cable Aging Management- Initial Research

Cable research began in the mid-1980s Initial focus was on low voltage cables

(< 600 volts) Research issues studied included:

– Aging effects of thermal, radiation and combined thermal and radiation

– Condition assessment of jackets and insulation

– Thermally induced currents – Condition monitoring of cables (Indenter,

frequency domain reflectometry) Focused shifted to medium voltage

cables (> 600V ≤ 15 kV) in the late 1990’s to address submergence degradation (water trees)

Relative Thermal Aging curves for cable insulation and jacket materials commonly used in US plants

3© 2017 Electric Power Research Institute, Inc. All rights reserved.

Existing Nuclear Sector- Low Voltage Cable ResearchResearch Area Subject EPRI Report

Cable Aging Management Aging management program guidance and harvesting guide

1020804, 1021629, 3002002994

Condition Monitoring-CableTesting

Test applicability matrix:LIRA testing:

10229691015209

Stressors and Degradation Modes and Condition Monitoring-LV Cable Failure Mechanism Research

Adverse environment, indenter,visual tactile, acceptance criteria, polymer condition monitoring date (CPAD, NEPO)

TR-109619, TR-104075, 1001391, 1008211, 1011874, 1011873

All-Training

Low voltage training course,CBT on visual tactile, ALEE

Held every July in CLT. 1022979

Operating Environments - Cable LTO Research

In-containment radiation and temperature data

3002000816 (phase I), Phase II in progress

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4© 2017 Electric Power Research Institute, Inc. All rights reserved.

Existing Nuclear Sector Research- Medium Voltage Cable Research Area Subject EPRI Report

Cable Aging Management Aging management program guidance and harvesting guide

3002000557, 10210703002002994

Condition Monitoring- Test applicability matrix:Tan Delta test evaluation:

10229693002005321, 1025262

Stressor/Degradation Modes-MVCable Failure Mechanism Research

Evaluation of wet aging of various MV cable types,

MV Cable Polymer Handbook

1018777,1021069, 1022965,1024894, 3002000554, 3002002993, 30020053233002005322

Mitigation-Life cycle management

End of life guide for MV cable and accessoriesBlack EPR Rejuvenation

1025259

3002000551

Operating Environments and Improved Condition Monitoring-Cable LTO Research

In-containment radiation and temperature data, Kema On-Line PD measurement

3002005517, 3002000816, 3002003001

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Cable Research- Development of Aging Management Programs

Focus shifted to aging management program development in 2009– Implementation guides issued in 2010 for

I&C, low voltage power and medium voltage cables

Aging management guides dictate– Scoping (not limited to license renewal)– Identifying cable stressors Thermal damage, radiation,

submergence…– Walkdown guidance to identify adverse

equipment environments – Condition monitoring (tan delta, visual

tactile, indenter, frequency domain reflectometry, etc.)

– Health reporting– Documentation

Representation of scoping methodology provided in EPRI cable aging management guides

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Cable Aging Research- Support Beyond 60

Long term operation (LTO)-supporting since 2012 – How long will cables last?– How will we know?

Expanded Material Degradation Assessment (EMDA)– Identified level of knowledge– Knowledge gaps identified

Research Coordination and Collaboration group started in June, 2012 LTO Research Roadmap to track

research-January, 2014

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Current EPRI Long Term Operation Activities/Research

Organized quarterly Research Coordination, Collaboration Meetings and maintain research roadmap Submergence- Qualification research Cable operating environment- collecting cable

radiation and temperature data Developing better condition monitoring tools Updating EPRI License Renewal Electrical

Handbook for SLR Support of IAEA, IGALL Revision 3 Interaction with international EPRI members-

support of long term operation efforts (Belgium, China, Czech Republic, France, Japan, Korea, Slovenia, South Africa, Sweden)

Submergence Qualification Aging Tank

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Summary

There is a large amount of EPRI research supporting cable aging that has already been completed DOE, EPRI and NRC and our research partners (National Labs and

NIST) communicate to ensure needed research will address EMDA knowledge gaps and update our plans and track progress to ensure it will be ready to support initial license request for beyond 60 years operation Aging management guides exist and will be updated as new research

results, implementation lesson learned, and OE dictate EPRI Cable UG- Meets yearly, provides industry forum to:

– Status aging management implementation progress, lesson learned– Discuss industry cable operating experience – Discuss recent EPRI research results, status industry on in-progress EPRI

research – Networking between utility, NRC, DOE researchers, academia, cable

manufacturer’s and service providers

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