Kinetic degradation model for insulating materials used on nuclear power plant safety cables

Author

Fuse, N. ; Homma, Hiroya ; Okamoto, Tatsuaki

Author_Institution

Electr. Power Eng. Res. Lab., Central Res. Inst. of Electr. Power Ind., Yokosuka, Japan

Volume

21

Issue

1

fYear

2014

fDate

41671

Firstpage

24

Lastpage

32

Abstract

A new degradation model for safety cables in nuclear power plants that incorporates the critical antioxidant concentration concept is proposed in order to account for the effect of antioxidants and to simulate several synergisms in various thermal and radiation environments. A chemical reaction scheme is used to represent oxidation reactions via the decomposition of peroxide radicals. The effects of antioxidants are included in this scheme in order to demonstrate critical concentration phenomena. In addition, diffusion equations are added to the reaction rate equations to enable reproduction of diffusion-limited oxidation. Such a degradation model with antioxidant effects is discussed for degradation behaviors in polymers used for safety cables under various dose rates and temperature conditions, and its effectiveness is verified.

Keywords

insulating materials; nuclear power stations; oxidation; power cable insulation; safety systems; chemical reaction scheme; critical antioxidant concentration concept; diffusion equations; diffusion limited oxidation; insulating materials; kinetic degradation model; nuclear power plant safety cables; oxidation reactions; peroxide radicals; radiation environments; reaction rate equations; thermal environments; Chemicals; Degradation; Equations; Materials; Mathematical model; Oxidation; Safety; Nuclear power plants; criticalantioxidant concentration; degradation model; diffusion limited oxidation; non-Arrhenius behaviors; safety cables;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/TDEI.2013.004049

Filename

6740722