 Reliability of cable insulation under reaction- and diffusion-controlled thermal degradationYuan-Shang Chang and Ali Mosleh Journal of Risk and Reliability, 2019, vol. 233, issue 4, 639-647 Abstract: 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. Keywords: Bayesian parameter estimation; modeling; cable insulation; polymer; aging; cross-linked polyethylene; ethylene propylene rubber; silicone rubber; radiation; thermal degradation; normalized elongation at break; diffusion control; reaction control (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:sae:risrel:v:233:y:2019:i:4:p:639-647 Access Statistics for this article More articles in Journal of Risk and Reliability |
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