ML21015A321
| ML21015A321 | |
| Person / Time | |
|---|---|
| Issue date: | 01/15/2021 |
| From: | Hector Rodriguez-Luccioni NRC/NRR/DNRL/NLRP |
| To: | |
| Rodriguez-Luccioni H | |
| References | |
| Download: ML21015A321 (7) | |
Text
Electrical and I&C Components Longer Term Operations Andrew Mantey Principal Project Manager NRC Public Meeting January 21, 2021 www.epri.com © 2021 Electric Power Research Institute, Inc. All rights reserved.
Cable Aging Management Cable aging is most affected by operating environment: temperature, radiation exposure, and electrical stress (medium voltage cables only)
Temperature and radiation levels in cable locations, except local adverse environments, would not lead to large amounts of cable replacement (slide 4)
Thermal resiliency of the polymer (e.g., cross-linked polyethylene, ethylene propylene rubber, silicon rubber) will determine service life Cable aging management programs are designed to:
- Identify, via periodic walkdowns, local adverse environments and cables adversely affected by those environments
- Use of condition monitoring to identify if cable insulation is degraded, and to what level
- Use the corrective action program (CAP) to determine the extent of degradation, required actions, and extent of condition
- Mitigate, repair, or replace cables to maintain overall Thermal degradation showing that cables age based on both the plant safety and reliability environment and by polymer type. The cracked cable jacket is chloroprene; the black cable jacket is chloro-sulfonated polyethylene.
2 www.epri.com © 2021 Electric Power Research Institute, Inc. All rights reserved.
Cables Aging Management Examples of EPRI research supporting aging management:
- Developed guidance for cable aging management program implementation as required by GALL which have been used to identify adverse environments and cable degradation
- Developed guidance to support periodic cable walkdowns to identify adverse local equipment environments
- Development of condition monitoring tests to identify degraded insulation in the worst environments (covered by GALL XI.E1, E2, E3 (GALL-SLR for XI.E3 a, b, c), E4, E5, and E6)
DOE LWRS program, EPRI, and NRC Research maintain a joint roadmap and meets regularly to discuss research EPRI has established a Cable Users Group to monitor industry operating experience EPRI will update aging management guidance, as required, Water tree degradation of medium based on new research results and operating experience voltage cable insulation 3 www.epri.com © 2021 Electric Power Research Institute, Inc. All rights reserved.
Highlights of EPRI Research on Cable Aging Management Topic Title Low-Voltage and Instrumentation and Control Cable Aging Management Guide, Revision 1 Cable Aging Aging Management Program Guidance for Medium-Voltage Cable Systems for Nuclear Power Plants, Revision 1 Management Cable Polymer Material HandbookInstrument Cable Program Cable Polymer Material HandbookLow Voltage Power and Control Cable Implementation Cable Polymer Material HandbookInstrument Cable Plant Engineering: Medium-Voltage Cable Failure Mechanism, Update 7: Evaluation of Main Factors Causing Formation of Large Water Trees in Service-Aged, Pink and Brown Ethylene Propylene Rubber-Insulated Medium-Voltage Cables Plant Engineering: Medium-Voltage Cable Failure Mechanism Research, Update 6 Failure Plant Engineering: Medium-Voltage Cable Failure Mechanism Research, Update 5 Mechanism MV Cable Accessory Research: 35-kV Termination Investigation. EPRI, Palo Alto, CA: 2019.
Research Lead-Free Rubber Cable Materials: Technical Evaluation Results of Radiation and Temperature Monitors: Research for Installed Cables at U.S. Nuclear Power Plants in Support of Long-Term Operations Effects of 0.1 Hertz Withstand Testing on Medium-Voltage Cable Insulation Evaluation and Insights from Nuclear Power Plant Tan Delta Testing and Data Analysis - Update Condition Monitoring Medium-Voltage Motor and Cable, Very-Low-Frequency (VLF) Tan Delta Testing from the Cable Termination Field Guide for Very Low Frequency Tan Delta Testing of Medium-Voltage Motors and Cables from the Cable Terminations Wireless Technologies as a Replacement for Degraded Cable Systems Mitigation and MV Cable Fault Location Troubleshooting Guide Replacement Results of Cable Rejuvenation of Severely Degraded Black Ethylene Propylene Rubber Medium-Voltage Cables Strategies 4 www.epri.com © 2021 Electric Power Research Institute, Inc. All rights reserved.
Aging Management Activities Inspection / Analysis / Mitigation / Repair /
Monitoring Evaluation Modernization Replacement 5 www.epri.com © 2021 Electric Power Research Institute, Inc. All rights reserved.
The Path Forward - Enhancements and Optimization Enhanced Data Data Utilization Trending Across Inspections Management
- Risk Informed the Industry
- Advanced Visual
- Electronic
- Predictive Analysis
- Increased Data Database Communication
- Monitoring
- Data Visualization between Utilities, technologies
- Digital Twin Regulators, and
- Advanced Research Nondestructive Evaluations 6 www.epri.com © 2021 Electric Power Research Institute, Inc. All rights reserved.
TogetherShaping the Future of Electricity 7 www.epri.com © 2021 Electric Power Research Institute, Inc. All rights reserved.