Effects of gamma irradiation on the degradation of silicone rubber by steam exposure

Seitaro Ito; Yu Miyazaki; Naoshi Hirai; Yoshimichi Ohki

doi:10.1080/00223131.2020.1815605

Effects of gamma irradiation on the degradation of silicone rubber by steam exposure

Seitaro Ito, Yu Miyazaki, Naoshi Hirai, Yoshimichi Ohki

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

Abstract

Silicone rubber (SiR) is an important electrical insulating material for safety-related cables in nuclear power plants. This means that SiR must withstand the irradiation of gamma rays and the exposure to high-temperature steam. However, SiR is vulnerable to hydrolysis. Therefore, for the purpose of clarifying the behavior of SiR in such environments, sheets of SiR were exposed to steam at 171 or 200°C with and without pre-irradiation of gamma rays. As a result, it has become clear that SiR can withstand the exposure to high-temperature steam more robustly if it was irradiated by gamma rays to a proper dose in advance.

Original language	English
Pages (from-to)	166-172
Number of pages	7
Journal	Journal of Nuclear Science and Technology
Volume	58
Issue number	2
DOIs	https://doi.org/10.1080/00223131.2020.1815605
Publication status	Published - 2021

Keywords

Inorganic polymer
degradation
insulation
irradiation
severe accident
silicone rubber
vapor exposure

ASJC Scopus subject areas

Nuclear and High Energy Physics
Nuclear Energy and Engineering

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title = "Effects of gamma irradiation on the degradation of silicone rubber by steam exposure",

abstract = "Silicone rubber (SiR) is an important electrical insulating material for safety-related cables in nuclear power plants. This means that SiR must withstand the irradiation of gamma rays and the exposure to high-temperature steam. However, SiR is vulnerable to hydrolysis. Therefore, for the purpose of clarifying the behavior of SiR in such environments, sheets of SiR were exposed to steam at 171 or 200°C with and without pre-irradiation of gamma rays. As a result, it has become clear that SiR can withstand the exposure to high-temperature steam more robustly if it was irradiated by gamma rays to a proper dose in advance.",

keywords = "Inorganic polymer, degradation, insulation, irradiation, severe accident, silicone rubber, vapor exposure",

author = "Seitaro Ito and Yu Miyazaki and Naoshi Hirai and Yoshimichi Ohki",

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year = "2021",

doi = "10.1080/00223131.2020.1815605",

language = "English",

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T1 - Effects of gamma irradiation on the degradation of silicone rubber by steam exposure

AU - Ito, Seitaro

AU - Miyazaki, Yu

AU - Hirai, Naoshi

AU - Ohki, Yoshimichi

N1 - Funding Information: This research was performed under the research entrusted by Secretariat of Nuclear Regulation Authority in Japan.

PY - 2021

Y1 - 2021

N2 - Silicone rubber (SiR) is an important electrical insulating material for safety-related cables in nuclear power plants. This means that SiR must withstand the irradiation of gamma rays and the exposure to high-temperature steam. However, SiR is vulnerable to hydrolysis. Therefore, for the purpose of clarifying the behavior of SiR in such environments, sheets of SiR were exposed to steam at 171 or 200°C with and without pre-irradiation of gamma rays. As a result, it has become clear that SiR can withstand the exposure to high-temperature steam more robustly if it was irradiated by gamma rays to a proper dose in advance.

AB - Silicone rubber (SiR) is an important electrical insulating material for safety-related cables in nuclear power plants. This means that SiR must withstand the irradiation of gamma rays and the exposure to high-temperature steam. However, SiR is vulnerable to hydrolysis. Therefore, for the purpose of clarifying the behavior of SiR in such environments, sheets of SiR were exposed to steam at 171 or 200°C with and without pre-irradiation of gamma rays. As a result, it has become clear that SiR can withstand the exposure to high-temperature steam more robustly if it was irradiated by gamma rays to a proper dose in advance.

KW - Inorganic polymer

KW - degradation

KW - insulation

KW - irradiation

KW - severe accident

KW - silicone rubber

KW - vapor exposure

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