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We have evaluated the thermal and radiation degradation of flame-retardant ethylene-propylene rubber (EPR) insulators used for safety cables in nuclear power plants. Accelerated degradation of EPR sheets was conducted under conditions of (1) simultaneous thermal-radiation aging (100 °C and 1.0 kGy/h), (2) radiation aging (room temperature and 1.0 kGy/h), and (3) thermal aging (100 °C or 200 °C, and...
To clarify the deterioration mechanism of cables installed in nuclear power plants, three kinds of XLPE sheets with various antioxidant contents were aged by 100 Gy/h γ-ray irradiation at room temperature, 60, and 100°C. The remaining antioxidant content estimated from an oxidation induction time of a differential calorimetric thermogram as well as the elongation at break decreases faster as the initial...
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