Electrical and Mechanical Condition Assessment of Low Voltage Unshielded Nuclear Power Cables Under Simultaneous Thermal and Mechanical Stresses: Application of Non-Destructive Test Techniques

Afia, Ramy S. A.; Mustafa, Ehtasham; Tamus, Zoltán Ádám

doi:10.1109/access.2020.3048189

Cited by 10 publications

(15 citation statements)

References 37 publications

(50 reference statements)

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“…In contrast, the mobility of free radicals in the crystalline area is limited; thus, they are trapped in the crystalline region, altering the performance of the dielectric material [27]. Furthermore, the trapped radicals tardily migrate to the interface between the amorphous and crystalline phases, leading to bond with oxygen which causes more oxidative degradation, Figure 15 [26,41]. In the amorphous phase, chemical reactions, cross-linking, chain-scission, and oxidation, occur easily.…”

Section: Hardnessmentioning

confidence: 99%

“…However, the EaB test is naturally destructive, and it requires samples removal; thus, it is not practical for on-site testing [2,5,10,26]. Therefore, non-destructive electrical-based condition monitoring techniques have been the focus of scientific interest, such as dielectric spectroscopy, return voltage measurement, and the polarization-depolarization current method [8][9][10]14,15,19,20,[26][27][28][29][30]. These techniques have been successfully adapted to various insulation systems [2,5,26,30].…”

Section: Introductionmentioning

confidence: 99%

“…However, the EaB measurement is a commonly used method to determine the degradation of polymers [ 24 , 25 ]. However, the EaB test is naturally destructive, and it requires samples removal; thus, it is not practical for on-site testing [ 2 , 5 , 10 , 26 ]. Therefore, non-destructive electrical-based condition monitoring techniques have been the focus of scientific interest, such as dielectric spectroscopy, return voltage measurement, and the polarization-depolarization current method [ 8 , 9 , 10 , 14 , 15 , 19 , 20 , 26 , 27 , 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, non-destructive electrical-based condition monitoring techniques have been the focus of scientific interest, such as dielectric spectroscopy, return voltage measurement, and the polarization-depolarization current method [ 8 , 9 , 10 , 14 , 15 , 19 , 20 , 26 , 27 , 28 , 29 , 30 ]. These techniques have been successfully adapted to various insulation systems [ 2 , 5 , 26 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

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Aging Mechanisms and Non-Destructive Aging Indicators of XLPE/CSPE Unshielded LV Nuclear Power Cables Subjected to Simultaneous Radiation-Mechanical Aging

2021

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Low-voltage cable systems in nuclear power plants are key components that have a crucial role in the safe operation of nuclear facilities. Thus, the aging management of cable systems is of utmost importance as they cannot easily or economically be replaced or upgraded. Therefore, there is a continuous need to develop reliable non-destructive condition monitoring techniques, mostly based on the measurement of the dielectric properties of cable insulation. This paper introduces the changing of dielectric and mechanical properties of XLPE insulated and CSPE jacketed unshielded low-voltage nuclear power plant power cable in case of simultaneous mechanical and radiation aging. The cable samples were bent and exposed to 400 kGy gamma irradiation with a 0.5 kGy/hr dose rate. Dielectric response (real and imaginary permittivity) in the 0.1 Hz−1 kHz frequency range, extended voltage response (EVR), and the Shore D hardness test techniques were measured to track aging. The electrical and mechanical parameters have increased monotonically with aging, except the imaginary permittivity, which increased only at frequencies higher than 10 Hz. Furthermore, different quantities were deducted based on the frequency and permittivity data. The electrical parameters and deducted quantities correlation with aging and mechanical parameters were investigated. Since the deducted quantities and the electrical parameters are strongly correlated with absorbed dose and mechanical properties, the electrical measurements can be applied as a non-destructive aging indicator for XLPE/CSPE unshielded low-voltage nuclear power cables.

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Section: Hardnessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Aging Mechanisms and Non-Destructive Aging Indicators of XLPE/CSPE Unshielded LV Nuclear Power Cables Subjected to Simultaneous Radiation-Mechanical Aging

2021

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“…This latter reasoning raised the possibility to explore other condition monitoring techniques which can overcome the EaB limitations. Among the different techniques, dielectric spectroscopy has been gaining more and more interest due to its numerous advantages, i.e., it is a nondestructive technique, it refers to the entire cable insulation and it has been successfully correlated to the aging development of the cable properties at various scales [3], [16][17][18][19][20]. However, the use of the tensile stress technique over many years allowed the development of a copious number of modelling approaches aiming at predicting the life of the LV cables through EaB [12].…”

Section: Introductionmentioning

confidence: 99%

Aging Modeling of Low-Voltage Cables Subjected to Radio-Chemical Aging

Suraci

Fabiani

2021

IEEE Access

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This article presents the development and application of a modelling approach based on quantities obtained from mechanical and electrical tests to assess the aging of low voltage cable insulation for nuclear applications. In order to obtain experimental data needed for the establishing of the models, accelerated aging is performed on coaxial cables. The first part of this paper focuses on the development of a predictive modelling for mechanical properties; this allows the evaluation of the Dose to Equivalent Damage (DED) as a function of the aging stress (dose rate). However, the use of mechanical tests for cable aging assessment presents some problems, being such tests destructive for the insulation and potentially affected by local defects. The novelty of this work lays on the introduction of a new model, allowing the definition of the end-of-life point in terms of electrical non-destructive tests. The second part of this article presents the development of aging modelling of cable insulation and correlation with experimental data obtained at different stresses, which allow the estimation of the expected life of the cable under test to be derived from diagnostic measurements of electrical properties like, e.g, tan. Finally, the application of the proposed life model to two typical real-condition nuclear environments is presented and discussed.INDEX TERMS Modelling of insulations, LV cables, Nuclear cables, radio-chemical aging, predictive modeling, cable life modeling, polymer aging, extruded cables.

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Multi scale aging assessment of low-voltage cables subjected to radio-chemical aging: Towards an electrical diagnostic technique

et al. 2021

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Electrical and Mechanical Condition Assessment of Low Voltage Unshielded Nuclear Power Cables Under Simultaneous Thermal and Mechanical Stresses: Application of Non-Destructive Test Techniques

Cited by 10 publications

References 37 publications

Aging Mechanisms and Non-Destructive Aging Indicators of XLPE/CSPE Unshielded LV Nuclear Power Cables Subjected to Simultaneous Radiation-Mechanical Aging

Aging Mechanisms and Non-Destructive Aging Indicators of XLPE/CSPE Unshielded LV Nuclear Power Cables Subjected to Simultaneous Radiation-Mechanical Aging

Aging Modeling of Low-Voltage Cables Subjected to Radio-Chemical Aging

Multi scale aging assessment of low-voltage cables subjected to radio-chemical aging: Towards an electrical diagnostic technique

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