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Mechanical aging trend in ethylene propylene rubber-insulated safety cables sampled from bwr nuclear power containment.

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Title: Mechanical aging trend in ethylene propylene rubber-insulated safety cables sampled from bwr nuclear power containment.
Authors: Fuse, N.1, Kanegami, M.1, Misaka, H.1, Homma, H.1, Okamoto, T.1
Source: IEEE Transactions on Dielectrics & Electrical Insulation. Oct2014, Vol. 21 Issue 5, p2012-2019. 8p.
Subjects: Ethylene-propylene rubber, Electric insulators & insulation, Electric cables, Boiling water reactors, Nuclear power plants, Nuclear reactor containment, Safety
Abstract: Statistical analysis has been performed on variously aged ethylene propylene rubber insulation on cables removed from boiling water reactor-type containment. Temperature and dose rate conditions of such cables are not identical. Therefore, elongation at break data observed for such insulation are converted to each equivalent period under 60 ?C, 10 mGy/h condition. The aging trend is found to be approximately slower by half than that expected from accelerated aging test results. Furthermore, this aging trend is used as a reference to fit to each elongation value, and the fitted curve is extrapolated to find the end of service life, which is defined as 70 % of absolute elongation. Lifetimes estimated from this method and from predictions by the accelerated aging test are compared on an Arrhenius plot. It is suggested that the latter lifetime estimation is shorter than actual. The temperature dependence also suggests a difference in a basic chemical reaction under the two aging conditions, which results in apparent differences in activation energies and pre-exponential factors. [ABSTRACT FROM AUTHOR]
Copyright of IEEE Transactions on Dielectrics & Electrical Insulation is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Mechanical aging trend in ethylene propylene rubber-insulated safety cables sampled from bwr nuclear power containment.
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  Data: <searchLink fieldCode="DE" term="%22Ethylene-propylene+rubber%22">Ethylene-propylene rubber</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+insulators+%26+insulation%22">Electric insulators & insulation</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+cables%22">Electric cables</searchLink><br /><searchLink fieldCode="DE" term="%22Boiling+water+reactors%22">Boiling water reactors</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+power+plants%22">Nuclear power plants</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+reactor+containment%22">Nuclear reactor containment</searchLink><br /><searchLink fieldCode="DE" term="%22Safety%22">Safety</searchLink>
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  Data: Statistical analysis has been performed on variously aged ethylene propylene rubber insulation on cables removed from boiling water reactor-type containment. Temperature and dose rate conditions of such cables are not identical. Therefore, elongation at break data observed for such insulation are converted to each equivalent period under 60 ?C, 10 mGy/h condition. The aging trend is found to be approximately slower by half than that expected from accelerated aging test results. Furthermore, this aging trend is used as a reference to fit to each elongation value, and the fitted curve is extrapolated to find the end of service life, which is defined as 70 % of absolute elongation. Lifetimes estimated from this method and from predictions by the accelerated aging test are compared on an Arrhenius plot. It is suggested that the latter lifetime estimation is shorter than actual. The temperature dependence also suggests a difference in a basic chemical reaction under the two aging conditions, which results in apparent differences in activation energies and pre-exponential factors. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of IEEE Transactions on Dielectrics & Electrical Insulation is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1109/TDEI.2014.004464
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 2012
    Subjects:
      – SubjectFull: Ethylene-propylene rubber
        Type: general
      – SubjectFull: Electric insulators & insulation
        Type: general
      – SubjectFull: Electric cables
        Type: general
      – SubjectFull: Boiling water reactors
        Type: general
      – SubjectFull: Nuclear power plants
        Type: general
      – SubjectFull: Nuclear reactor containment
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      – SubjectFull: Safety
        Type: general
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      – TitleFull: Mechanical aging trend in ethylene propylene rubber-insulated safety cables sampled from bwr nuclear power containment.
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              Text: Oct2014
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