Degradation of flame-retardant ethylene-propylene-diene rubber by radiation and steam

Jiayi You; Hikaru Yamaguchi; Hiroyuki Ishii; Naoshi Hirai; Yoshimichi Ohki

doi:10.1002/tee.23227

Degradation of flame-retardant ethylene-propylene-diene rubber by radiation and steam

Jiayi You^*, Hikaru Yamaguchi, Hiroyuki Ishii, Naoshi Hirai, Yoshimichi Ohki

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

Safety-related cables in nuclear power plants must be functional even during the occurrence of a severe accident. In this regard, flame-retardant ethylene-propylene-diene rubber (FR-EPR) widely used for electrical insulation in safety-related cables was aged under several simulated severe accident conditions. Namely, ⁶⁰Co gamma rays were irradiated at two different dose rates to sheets of FR-EPR at room temperature or 100°C. After that, saturated or superheated steam was exposed to several sheets at a constant temperature of 155 or 220°C, or at six stepwise elevating temperatures from 120 to 220°C. Various mechanical properties and complex permittivity were measured for these sheets. As a result, the effects of heat, gamma-ray irradiation, and steam exposure on the degradation of FR-EPR were clarified.

Original language	English
Pages (from-to)	1572-1579
Number of pages	8
Journal	IEEJ Transactions on Electrical and Electronic Engineering
Volume	15
Issue number	11
DOIs	https://doi.org/10.1002/tee.23227
Publication status	Published - 2020 Nov 1

Keywords

FR-EPR
aging
complex permittivity
elongation at break
indenter modulus
tensile strength

ASJC Scopus subject areas

Electrical and Electronic Engineering

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10.1002/tee.23227

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title = "Degradation of flame-retardant ethylene-propylene-diene rubber by radiation and steam",

abstract = "Safety-related cables in nuclear power plants must be functional even during the occurrence of a severe accident. In this regard, flame-retardant ethylene-propylene-diene rubber (FR-EPR) widely used for electrical insulation in safety-related cables was aged under several simulated severe accident conditions. Namely, 60Co gamma rays were irradiated at two different dose rates to sheets of FR-EPR at room temperature or 100°C. After that, saturated or superheated steam was exposed to several sheets at a constant temperature of 155 or 220°C, or at six stepwise elevating temperatures from 120 to 220°C. Various mechanical properties and complex permittivity were measured for these sheets. As a result, the effects of heat, gamma-ray irradiation, and steam exposure on the degradation of FR-EPR were clarified.",

keywords = "FR-EPR, aging, complex permittivity, elongation at break, indenter modulus, tensile strength",

author = "Jiayi You and Hikaru Yamaguchi and Hiroyuki Ishii and Naoshi Hirai and Yoshimichi Ohki",

note = "Funding Information: This research was performed under the research entrusted by the Secretariat of the Nuclear Regulation Authority in Japan. Publisher Copyright: {\textcopyright} 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.",

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doi = "10.1002/tee.23227",

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T1 - Degradation of flame-retardant ethylene-propylene-diene rubber by radiation and steam

AU - You, Jiayi

AU - Yamaguchi, Hikaru

AU - Ishii, Hiroyuki

AU - Hirai, Naoshi

AU - Ohki, Yoshimichi

N1 - Funding Information: This research was performed under the research entrusted by the Secretariat of the Nuclear Regulation Authority in Japan. Publisher Copyright: © 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

PY - 2020/11/1

Y1 - 2020/11/1

N2 - Safety-related cables in nuclear power plants must be functional even during the occurrence of a severe accident. In this regard, flame-retardant ethylene-propylene-diene rubber (FR-EPR) widely used for electrical insulation in safety-related cables was aged under several simulated severe accident conditions. Namely, 60Co gamma rays were irradiated at two different dose rates to sheets of FR-EPR at room temperature or 100°C. After that, saturated or superheated steam was exposed to several sheets at a constant temperature of 155 or 220°C, or at six stepwise elevating temperatures from 120 to 220°C. Various mechanical properties and complex permittivity were measured for these sheets. As a result, the effects of heat, gamma-ray irradiation, and steam exposure on the degradation of FR-EPR were clarified.

AB - Safety-related cables in nuclear power plants must be functional even during the occurrence of a severe accident. In this regard, flame-retardant ethylene-propylene-diene rubber (FR-EPR) widely used for electrical insulation in safety-related cables was aged under several simulated severe accident conditions. Namely, 60Co gamma rays were irradiated at two different dose rates to sheets of FR-EPR at room temperature or 100°C. After that, saturated or superheated steam was exposed to several sheets at a constant temperature of 155 or 220°C, or at six stepwise elevating temperatures from 120 to 220°C. Various mechanical properties and complex permittivity were measured for these sheets. As a result, the effects of heat, gamma-ray irradiation, and steam exposure on the degradation of FR-EPR were clarified.

KW - FR-EPR

KW - aging

KW - complex permittivity

KW - elongation at break

KW - indenter modulus

KW - tensile strength

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Degradation of flame-retardant ethylene-propylene-diene rubber by radiation and steam

Abstract

Keywords

ASJC Scopus subject areas

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