Probabilistic model of degradation of cable insulations in nuclear power plants

Chang, Yuan-Shang; Mosleh, Ali

doi:10.1177/1748006x19827127

Cited by 12 publications

(24 citation statements)

References 21 publications

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“…In (2) and 3, is the reference capacitance, which was calculated based on the known dimensions of the electrodes and the cable, is the particular frequency during measurement and being the resistance at that particular frequency.…”

Section: ) Dielectric Spectroscopymentioning

confidence: 99%

“…Currently, the NPPs have a considerable share of the worldwide generation of electrical energy which is expected to increase by 17% by the year 2050 [1]. The safe and reliable operation of the NPPs is dependent on structures, systems, and components [2]. The low voltage (LV) cables are one such component, which supply power and control signals to equipment that are safety-related.…”

Section: Introductionmentioning

confidence: 99%

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Application of Non-Destructive Condition Monitoring Techniques on Irradiated Low Voltage Unshielded Nuclear Power Cables

2020

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In this paper, the effect of radiation stress on the overall degradation of jacket and insulation of low voltage unshielded power cable used in nuclear power plants is discussed. The XLPE insulated and CSPE jacketed cable samples were exposed to a total dose of 400 kGy γ-irradiation with 0.5 kGy/h dose-rate. Dielectric spectroscopy; complex permittivity, and extended voltage response; namely slopes of decay and return voltages were used to study the effect of the irradiation on the cable with an aim to establish the application of these techniques for a non-destructive condition monitoring of the unshielded cables. Shore D hardness was also used to investigate the mechanical characteristic of the cable. It was observed that the radiation stress affected the electrical and mechanical properties of the cable polymeric components i.e. insulation and jacket. The imaginary part of permittivity at low frequency; 100 Hz, the slope of return voltage, and hardness showed a significant increase with absorbed dose showing the effect of irradiation on the jacket and insulating material, as well. A strong correlation was observed between the imaginary part of permittivity at 100 Hz, slopes of return voltage, and hardness. The results show the dielectric measurement techniques are potential non-destructive condition monitoring methods for the unshielded low voltage nuclear power plant power cables for on-site diagnosis.

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Section: ) Dielectric Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of Non-Destructive Condition Monitoring Techniques on Irradiated Low Voltage Unshielded Nuclear Power Cables

2020

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“…25 Dichotomy model has been derived according to uniform degradation. [26][27][28] Hence, dichotomy model can be applied to the thermal degradation of the XLPE insulation under reaction control. Figure 1 visualizes the concept of dichotomy model.…”

Section: Reaction Controlmentioning

confidence: 99%

“…In Figure 1(c), when time elapses, more and more subcubes degrade. The total of the degraded subcubes, or degradation ratio (V d ), can be represented by equation (1) [26][27][28]…”

Section: Reaction Controlmentioning

confidence: 99%

“…25 Dichotomy model has been derived from the uniform degradation of the cable insulation made from EPR and SIR. [26][27][28] This article has applied the same model to the cable insulation made from XLPE to represent the thermal degradation of the EAB caused by reaction control. As for the thermal degradation resulting from diffusion control, this study replaces the concept of degradation ratio (V d ) [26][27][28] in dichotomy model by the integral of a diffusion equation.…”

Section: Introductionmentioning

confidence: 99%

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Reliability of cable insulation under reaction- and diffusion-controlled thermal degradation

Chang

Mosleh

2018

Proceedings of the Institution of Mechanical Engineers, Part O:

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Cables transmit signals and power in nuclear power plants. The primary material for the cable insulation is cross-linked polyethylene, which inevitably degrades due to thermal stress. The degradation can become a safety issue, since the brittleness of degraded cross-linked polyethylene may render the exposure of the metal core in a cable. Elongation at break is a widely accepted measurement, evaluating the degree of the brittleness of the insulation. Reaction- and diffusion-controlled kinetics are proposed in this article to quantitatively predict the decrease of the elongation at break as a function of time and temperature. The proposed approaches are based on dichotomy model and Fick’s Law to respectively define the degree of reaction- and diffusion-controlled degradation. Probabilistic techniques are developed by Bayesian parameter estimation to determine the reliability of the cable insulation. These approaches are validated by experimental data.

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Study of Electrical Integrity of Low Voltage Nuclear Power Cables in Case of Plant Life Extension

Mustafa¹,

Afia²,

Bal³

et al. 2020

IFIP Advances in Information and Communication Technology

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During the last couple of decades, many nuclear power plant operators are seeking the life extension of the operating nuclear power plants. This makes the condition assessment of major components in the plant an important topic. One such component is low voltage power and instrumentation and control cables, which are more than 1000 km in length and makes their replacement a severe cost burden. Since these cables during service are under high thermal and radiation stress, hence making the condition assessment of them inevitable. The thermal stress as compared to other stresses results in the structural change and hence effecting the electrical integrity of the cable insulation. In this work, the complex permittivity of the XLPE/CSPE based low voltage nuclear power cable will be studied under thermal stress. The potential electrical aging markers from the measurement will help in calculating the expected lifetime of the cable for the case of life extension of the nuclear power plants.

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Probabilistic model of degradation of cable insulations in nuclear power plants

Cited by 12 publications

References 21 publications

Application of Non-Destructive Condition Monitoring Techniques on Irradiated Low Voltage Unshielded Nuclear Power Cables

Application of Non-Destructive Condition Monitoring Techniques on Irradiated Low Voltage Unshielded Nuclear Power Cables

Reliability of cable insulation under reaction- and diffusion-controlled thermal degradation

Study of Electrical Integrity of Low Voltage Nuclear Power Cables in Case of Plant Life Extension

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