Abstract
Department of Environmental Health, Seonam University, Namwon 590-711, Korea(Received July 9, 2015; Revised July 23, 2015; Accepted July 24, 2015)Abstract: In this paper, EPR (ethylene propylene rubber) insulation material was accelerated degradation test at 121, 136, 151, and experiment the typical EAB (elongation at break) at mechanical characteristics analysis. It is shown that the failure-time at the point of 50% of the initial value of Elongation rate to obtain the activation energy. The failure-time was shown each 5,219 hr, 3,165 hr, and 668 hr at three temperatures. In order to derive the activation energy, Arrhenius methodology was applied. Also, we got the Arrhenius plot from three accelerated temperatures. The activation energy values got 0.98 eV from EAB test. The experimental data were evaluated for estimating the probability density, and the suitable distribution by using statistical program MINITAB. It is shown that EAB data by the acceleration thermal degradation is most suitable for the Weibull distribution.Keywords: Nuclear cable, EPR, Arrhenius equation, Activation energy, EAB, Statistical evaluation)*+ 케이블의 절연체 및 자켓은 XLPE (cross-linking polyethylene), EPR (ethylene proplyene rubber), CR (chloroprene rubber)고무, CSP (chloro sulphonated polyethylene) 등이 사용되고 있으며, 원자력발전소에 사용되는 케이블의 경우에는 고온, 고압, 방사선에 견디
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