assessment of non-metallic materials degradation€¦ · objective zcondition monitoring of safety...
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Kinectrics Inc.Life Cycle Management Solutions
Condition Monitoring Condition Monitoring ofof
Low Voltage CablesLow Voltage Cables
K. (Anand) ANANDAKUMARANKinectrics Inc.,
Toronto, Canada
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ObjectiveObjective
Condition Monitoring of Safety Related Cables Performance under a Design Basis Accident Event (DBA)We have concentrated on three cable insulation types: PVC, XLPE, and EPRJacket types: Hypalon and PVC
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Condition Monitoring (CM) of Nuclear CablesCondition Monitoring (CM) of Nuclear Cables
Cables identified as one of the major nuclear plant life assurance or extension issues
Significant replacement cost
Inside containment the polymeric cable insulation vulnerable to thermal and irradiation degradation
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MATERIAL TYPESMATERIAL TYPESInsulation Materials
FRXLPE - Fire Retardant Crosslinked Polyethylene
FREPR - Fire Retardant Ethylene Propylene Rubber
FRPVC - Fire Retardant Polyvinyl Chloride
EPR - Bonded with Hypalon
Jacket MaterialsPVC Hypalon (Chloro-sulphonated polyethylene CSPE)Neoprene
Insulation Materials – Special ApplicationsTefzelKaptonPeek
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Cable ConstructionCable Construction
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Fire Retardant EPR FORMULATIONFire Retardant EPR FORMULATIONFORMULATION NUMBER, TRADE NAME, etc.
CHEMICAL INGREDIENTS PRESENTMANUFACTURING PROCESS
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Most Popular Cable InsulationMost Popular Cable Insulation -- Used Inside Containment U.S. Nuclear Power PlantsUsed Inside Containment U.S. Nuclear Power Plants
Cable Manufacturer (Material -
Trade Name)
Number of Plants
Rockbestos Firewall III (XLPE) 61Brand – Rex (XLPE) 30Raychem Flametrol (XLPE) 23
Anaconda Y Flame-Guard FR (EPR) 35Okonite FMR (EPR) 26Samuel Moore Dekoron Dekorad (EPDM) 19BIW Bostrad 7E (EPR) 19Kerite HTK (EPR like) 25
Rockbestos (Coax, SR) 24Kerite FR (SR) 13
Ref: Electric Power Research Institute, EPRI TR-103841-R1. Low Voltage Environmentally-Qualified Cable License Renewal Industry Report, Revision 1.(1994)
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CHARACTERIZATION / IDENTIFICATION CHARACTERIZATION / IDENTIFICATION -- TechniquesTechniques
FTIR SpectroscopySolubilityDensityOxidation Induction Time (OIT)Melting & Glass Transition TemperatureThermo-gravimetric Analysis (TGA)Gas Chromatography (GC)X-Ray Fluorescence (XRF)Neutron Activation Analysis (NAA)
Sample Size: XLPE/EPR ~ ½ cm long insulation specimen required
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FTIR SPECTROSCOPYFTIR SPECTROSCOPYFTIR: The amount of light absorbed/ transmitted /reflected by a sampleplaced in the light path at various wavelengths of an IR light range is measured. The energy absorption spectrum is characteristic of the structure of materials absorbing the IR light.
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NIR (Near Infrared) TechnologyNIR (Near Infrared) TechnologyNon-destructive – Light Colors onlyMaterials absorb IR at characteristic frequenciesCapable of discriminating between formulationsFlexible, fiber-optic probe for easy access to cablesUsed on > 10,000 cables samples in CANDU plants
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NIR IDENTIFICATIONNIR IDENTIFICATION
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Cable Service EnvironmentCable Service Environment
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FAILURE MECHANISMS FAILURE MECHANISMS OFOF SAFETYSAFETY--RELATED CABLESRELATED CABLES
Aging stresses: temperature, radiation, vibration (for cables connected to running machines) and moisture.
For I&C cables (<1 kV) electrical stress not significantKinetics of the degradation: Controlled by the additives present in insulation and polymer structure.XLPE/EPR insulated cable – hardening, loss of flexibility, and cracking.EPR- bonded with Hypalon – hardening of Hypalon, cracking of EPRPVC insulated cable – PVC and plasticizers breakdown, forming ionic salts causing poor electrical performance during steam test.Tefzel insulated cable – Combination of radiation / steam exposure result in circumferential cracking.Kapton – Steam exposure causes unfurling of insulation and cause poor electrical performance.
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Visual InspectionVisual Inspection
Cable ConditionsDiscolorationDull SurfaceGreen OozeOily SurfaceCrackingCrystals (plasticizer hydrolysis by-products)
White DustStiff
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Visual Inspection Visual Inspection –– PVC AgingPVC Aging (As Rec(As Rec’’d and Thermal Aged)d and Thermal Aged)
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Visual Inspection Visual Inspection –– PVC Jacket AgingPVC Jacket Aging
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Degraded PVC Shrink SleevesDegraded PVC Shrink Sleeves
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Hypalon Jacket CrackingHypalon Jacket Cracking –– White Powdery DepositWhite Powdery Deposit
Photograph of XLPE insulated coax cable showing cracking of Hypalon jacket after LOCA
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Hypalon Jacket CrackingHypalon Jacket Cracking
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Tefzel InsulationTefzel Insulation –– Cracking after Steam ExposureCracking after Steam Exposure
Before Steam Exposure (+10 to 15Mrad) After Steam Exposure
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VisualVisual Inspection Inspection -- KaptonKapton
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Condition MonitoringCondition Monitoring –– Destructive CM TechniquesDestructive CM Techniques
Elongation-at-BreakUseful to assess aging for all cable materialsFailure is due to insulation Hardening, Loss of Flexibility and insulation cracking (XLPE & EPR insulated cables)Dumbbell or tubular (without conductor) specimen pulled at 50 mm/min until breakage. % Elongation = {(L2- L1) / L1} X 100
L1 = initial gauge spacingL2 = gauge spacing at rupture
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Acceptance CriterionAcceptance Criterion--XLPE/EPR InsulationXLPE/EPR Insulation
Elongation Values of XLPE 2 Insulation After Radiation,
Thermal, and Sequential Radiation + Thermal Exposures.
Elongation Values of EPR 2 Insulation After Radiation, Thermal, and Sequential Radiation + Thermal Exposures.
Acceptance criteria: 50% Absolute Elongation
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Sample Dimension for Sample Dimension for Destructive TechniquesDestructive Techniques
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DSC Oxidation Induction Time (OIT)DSC Oxidation Induction Time (OIT)
10 Mg Sample RequiredIndicator of Stabilizer EffectivenessLength of Induction Time which precedes active oxidationStabilizer Concentration Depletes with Aging - OIT ↓ with aging
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Correlation of OIT with ElongationCorrelation of OIT with Elongation
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OIT & ELONGATION DATA OF OIT & ELONGATION DATA OF FIELD AGED EPR 1 INSULATIONFIELD AGED EPR 1 INSULATION
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NonNon--Destructive Technique Destructive Technique –– Cable IndenterCable Indenter
Developed by EPRISuitable for Installed Cables in US plantsPrimary Aging Environment –ThermalHypalon and Neoprene Jackets Jackets Hardens with Thermal Aging
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NonNon--Destructive Technique Destructive Technique –– Cable IndenterCable Indenter
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NonNon--Destructive Technique Destructive Technique –– Cable IndenterCable Indenter
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Test Results Test Results -- Cable IndenterCable Indenter
0
10
20
30
40
50
60
70
80
90
100
0 1000 2000 3000 4000 5000 6000 7000
Shifted Aging Time, Hours at 110˚C
Inde
nter
Mod
ulus
(N/m
m)
Jkt 110˚C (1X)
Jkt 120˚C (2.4X)
Ins 110˚C Jacketd Aging (1X)
Ins 120˚C Jacketd Aging (2.4X)
Ins 120˚C (2.4X)
Indenter results for CSPE outer jacket and EPR/CSPE composite insulation
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Test Results Test Results -- Cable IndenterCable Indenter
0
50
100
150
200
250
300
350
400
450
500
0 1000 2000 3000 4000 5000 6000 7000
Shifted Aging Time, Hours at 110˚C
% E
long
atio
n
Jkt 110˚C (1X)
Jkt 120˚C (2.4X)
Ins 110˚C (1X)
Ins 120˚C (2.4X)
Elongation results for CSPE outer jacket and EPR/CSPE composite insulation
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CONCLUSIONS
Nuclear power plant operators may be required by licensing authorities to present evidence that installed their I & C cables which were environmentally qualified for a 30 to 40 years life are able to perform their safety related function for the additional 20 to 30 year plant life extension.This provision would mean that the nuclear power plant operators will be required to know:The installed cable types at their nuclear power stations,The environmental conditions to which each of the installed I&C cables at their nuclear stations will be exposed,The results of comparison of the extended cable life conditions with the previous EQ test data which was derived using accelerated aging conditions in order that cable life can be extended through analysis.OrWe have shown:The ability to identify different insulation formulation types and to link them to known formulation types,Condition monitoring techniques to assess the condition of installed cables by destructive and non-destructive means,The ability to estimate the remaining life of the cable by comparing its aging data with the already known experimentally determined aging trends for various insulation formulationsThis will allow for replacement decisions to be made for only in the worst cases of cable insulation aging.