Cable condition monitoring for nuclear power plants

Shumaker, Brent; Campbell, Cherie J.; Sexton, Casey; Morton, G. W.; McConkey, J. Bryan; Hashemian, H.M.

doi:10.1109/fiiw.2012.6378325

Cited by 16 publications

(6 citation statements)

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“…In particular, FDR has been shown to provide the capability for detecting changes in the insulation or jacket material surrounding the cable conductors. 9…”

Section: Prognostic Model Development Using Fdr Datamentioning

confidence: 99%

“…In particular, FDR has been shown to provide the capability for detecting changes in the insulation or jacket material surrounding the cable conductors. 9 The FDR test involves sending an incident wave of varying frequencies through a cable and measuring reflected waves that are caused by impedance changes along its length. The reflections of the FDR signal are converted from the frequency domain to the time domain using an inverse fast Fourier transform (IFFT) and combined with the cable's velocity of propagation to plot the FDR amplitude as a function of distance along the cable length.…”

Section: Accelerated Aging Of Iandc Cablesmentioning

confidence: 99%

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Frequency domain reflectometry for remaining useful life estimation of instrumentation and control cables

Shumaker

McCarter

Hashemian

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part O:

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As the existing fleets of nuclear power plants age, a greater emphasis has been placed on technologies to quantify the remaining useful life of safety-critical components and to ensure that these systems will operate as intended when called upon, especially in emergency situations. Some of the most important, yet often overlooked components, are the cables that provide the signal paths for instrumentation and control systems used to ensure safe and efficient operation of nuclear power plants. Instrumentation and control cable aging, in particular, is primarily concerned with degradation of the polymer material by thermal oxidation while exposed to heat, humidity, radiation, and other environmental stressors. Consequently, as the polymer becomes embrittled, it cracks and becomes susceptible to moisture intrusion that can cause shorts and shunts in the cable circuits. This article describes the development of two prognostic models to estimate the remaining useful life of nuclear power plant cables. The first model uses data compiled in an existing polymer aging database as background for introducing the remaining useful life model development methodology. The second model uses data generated from accelerated cable aging experiments performed by the authors and explores the use of in situ electrical measurements such as frequency domain reflectometry for predicting the remaining useful life of instrumentation and control cables typically found in nuclear power plants.

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“…In particular, FDR has been shown to provide the capability for detecting changes in the insulation or jacket material surrounding the cable conductors. 9…”

Section: Prognostic Model Development Using Fdr Datamentioning

confidence: 99%

Section: Accelerated Aging Of Iandc Cablesmentioning

confidence: 99%

Frequency domain reflectometry for remaining useful life estimation of instrumentation and control cables

Shumaker

McCarter

Hashemian

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part O:

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“…In NPPs, several cable types are used, such as low and medium voltage (LV&MV) power cables, instrumentation and control (I&C) cables, special cables, and general service cables [6]. These cables provide the link between the plant safety and control systems via signaling to control equipment, plant operators, and safety systems [7], [8]. Through the normal operation of the plant, cables are exposed to multiple stresses such as electrical, mechanical, thermal, and environmental stresses [9].…”

Section: Introductionmentioning

confidence: 99%

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

2021

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“…The determination of the condition and possible damages of low-voltage cables is gaining importance, as they basically determine the safe operation of various critical systems [1][2][3][4]. Low-voltage cables are not designed to be partial discharge (PD) free at their test voltage, as the voids are not necessarily filled in their construction.…”

Section: Introductionmentioning

confidence: 99%

Repetition Rate of Partial Discharges in Low Voltage Cables

Cselko

2019

Period. Polytech. Elec. Eng. Comp. Sci.

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Diagnostic testing of low voltage cables by partial discharge measurement has several difficulties. One of them is that the cables are not designed to be partial discharge free at their test voltage. As partial discharge impulses may originate from numerous spots even in new cables, it is expected that impulses reach the termination with high repetition rate. The propagation of impulses in low voltage cables differs from the medium and high voltage cables; there is no lossy semiconducting layer or layers, but the cross section of the conductors are lower. The measurement method of partial discharges has to be adjusted to the discharge type and the propagation path as these determine the frequency content of the individual impulses, and the time resolution of the system has to be appropriate for the expected repetition rate. Measurements have been performed on various types of cables by different methods. Based on the results suggestions are given on the suitable measurement methods.

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Cable condition monitoring for nuclear power plants

Cited by 16 publications

References 0 publications

Frequency domain reflectometry for remaining useful life estimation of instrumentation and control cables

Frequency domain reflectometry for remaining useful life estimation of instrumentation and control cables

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

Repetition Rate of Partial Discharges in Low Voltage Cables

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