Degradation in Dielectric Behavior of Soft Epoxy Resin by Concurrent Aging with Heat and Radiation

Ishii, Hiroyuki; Yamaguchi, Hikaru; Mori, Keigo; Hirai, Naoshi; Ohki, Yoshimichi

doi:10.1109/ceidp47102.2019.9010557

Cited by 1 publication

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“…This trend, namely such a decrease in EAB, is general and seen very often in many polymers [5–7]. That is, when many rubbers and polymers are aged by being heated with or without simultaneous irradiation by gamma rays, they soon lose their softness and become hard [8–10]. On the other hand, the data of S1, S2, and S3 indicate that the effect of steam exposure given to the unaged FR‐EPR on its EAB is highly dependent on the pressure and temperature profiles of the steam exposure.…”

Section: Resultsmentioning

confidence: 99%

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

You

Yamaguchi

Ishii

et al. 2020

IEEJ Transactions Elec Engng

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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, 60 Co 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.

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Section: Resultsmentioning

confidence: 99%