Ageing of electric cables in light water reactors (LWRs) - Materials' Ageing and Degradation in Light Water Reactors - page 240

Table 6.3 Best cable measurement techniques for integrated cable condition
monitoring program

Testing method Part of cable

evaluated

In-
situ *

Remote
testing

Non-
destructive

Visual inspection I,CN,P ᅚ No ᅚ

Indenter I ᅚ No ᅚ

AgeAlert TM I ᅚ ᅚ ᅚ

TDR I,C,CN,P,S,T ᅚ ᅚ ᅚ

RTDR C,CN,P,S,T ᅚ ᅚ ᅚ

Impedance
measurements

I,C,CN,P,S,T ᅚ ᅚ ᅚ

Partial discharge I,C,CN,P,S,T ᅚ ᅚ ᅚ

Insulation resistance I,CN,P,S,T ᅚ ᅚ ᅚ

Dissipation factor
(Tan Delta)

I,CN,P,S,T ᅚ ᅚ ᅚ

FDR I,C,CN,P,S,T ᅚ ᅚ ᅚ

Infrared Thermography I,C,CN,P,S,T ᅚ No ᅚ

*In-situ: Tests that can be performed without disconnecting the cable from its
in-service connections or removing the end device.
Legend: Insulation and Jacket (I), Conductor (C), Connections (CN), Penetrations (P),
Splices (S), Terminations (T).

Time domain
reflectometry

Time domain
analysis

Difference
analysis

Wave reflection
analysis

Reverse time
domain
reflectometry

Time domain
analysis

Peak
detection

Difference
analysis

Frequency
domain
reflectometry

Phase/amplitude
analysis

Frequency
analysis

￿ ￿ ￿ ￿ ￿ ￿

Leakage current
measurements

Insulation
resistance

Dielectric
absorption ratio

Polarization
index

Polarization ratio Current/voltage

AC impedance
measurements

Inductance vs.
frequency

Capacitance vs.
frequency

Resistance (AC)
vs. frequency

Resistance/voltage
measurements

Resistance Voltage

6.2 Testing and analysis techniques in an integrated cable condition
monitoring system.