DEPARTMENT OF
ENERGY CABLE
AGING
MANAGEMENT
RESEARCH
PROJECTS REVIEW
Slide 1
CURRENT ACTIVITIES
• Research for U.S. Department of Energy
– “A Holistic Approach for In-Situ Cable Condition
Monitoring in Nuclear Power Plants.”
– “Integrated System for Management of Cable Aging
in Support of Long Life Operation of Nuclear Power
Plants.”
Slide 2
NRC AND EPRI
RECOMMENDATIONS
NRC DG 1240 Recommended
Testing Procedures
Direct Current High-Potential Test (dc High Voltage)
EPRI TR 1020804 Recommended
Testing Procedures
Visual/Tactile Assessment
Indenter Testing
Step Voltage Test (dc High Voltage)
Ultrasonic Velocity Assessment
Illuminated Borescope
Line Resonance Analysis
Visual Inspection
Near-Infrared Spectroscopy
Compressive Modulus (Polymer Indenter)
Laboratory Tests
Dielectric Loss – Dissipation Factor/Power Factor
Insulation Resistance/Polarization Index
Partial Discharge Test
Traditional Troubleshooting Techniques
EPRI TR 1020805 Recommended
Testing Procedures
Time Domain Reflectometery
Partial Discharge
Line Resonance Analysis
Tan Delta
Infrared Imaging Thermography
Power Frequency or
Very Low Frequency (VLF) Withstand
Slide 3
AMS CABLE AGING
MANAGEMENT PROGRAM
Cable Aging
Management
Program
Visual/Tactile
Electrical
Mechanical
Embedded
Sensors
Thermography
FDR
Indenter
AgeAlert™
Walkdown
TDR
EAB
LCR
IR
RTDR
Tan Delta
Partial
Discharge
Slide 4
ACCELERATED CABLE
AGING
Slide 5
ELONGATION AT BREAK
(EAB)
EAB sample prepared to the IEC 62582 Standard
Slide 6
CABLE AGING RESULTS
Cable Artificially Aged for 334 Hours at 150° C
FDR
IR
Slide 7
TDR RISE TIME
• How does the pulse rise time affect the
reflected signal?
• How does the length of the cable under
test affect the reflected signal of different
pulse rise times?
• Four TDR Pulsers
–
–
–
–
100ps
5ns
7ns
20ns
Slide 8
TDR RISE TIME
50 Ω Coaxial
Cable
Impedance
Change in Cable
Under Test
CABLE085-01
50 Ω Coaxial
Cable
Impedance
Impedance
Change
Change
Impedance
Change
50 Ω Coaxial
50 ΩCable
Coaxial
Cable
50 Ω Coaxial
Cable
Slide 9
ROCKBESTOS CABLE
TESTING
Slide 10
ROCKBESTOS CABLE
TESTING
IR Test
Baseline
Test 1
186.58 GOhms
Test 2
160.88 GOhms
Test 3
142.80 GOhms
Average 163.42 GOhms
TDR Trace Revealing Moisture Intrusion and Jacket Cuts
Moisture
Intrusion
53.77 GOhms
60.62 GOhms
57.32 GOhms
57.24 GOhms
FDR Trace Revealing Moisture Intrusion and Jacket Cuts
Slide 11
IN PLANT TESTING:
RTDS
Slide 12
IN PLANT TESTING:
NUCLEAR INSTRUMENTATION
Slide 13
2012 CHAR SYSTEM
• TDR
• RTDR
• LCR
• IR
• I-V
• FDR
• Waveform
Slide 14
THANK
YOU!
Slide 15