Abstract
Flame‐retardant cross‐linked polyolefin (FR‐XLPO), is widely used as insulators for electric cables. Several cables installed in nuclear power plants must be functional even when they suffer a severe accident. Therefore, sheets of FR‐XLPO were exposed to heat, gamma rays, and high‐temperature steam. Before and after such aging treatments, samples' mechanical and thermal properties and infrared and THz absorption spectra were measured. As a result, it has become clear that FR‐XLPO is fairly resistant to superheated steam with no oxygen, although it is easily degraded thermally if oxygen is present. It is also resistant to gamma rays to a certain extent. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.
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