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The accelerated thermal aging of a CSPE were carried out for 0, 80.82, 161.63 days at 100°C, which are equal to 0, 40 and 80 years, respectively. The volume electrical resistivities of the non-accelerated thermally aged CSPE and the accelerated thermally aged CSPE for 40y and 80y were 9.620×10 12 ∼1.246×10 13 Ω.cm, 5.066×10 12 ∼7.576×10 12 Ω.cm and 7.195×10 12 ∼9.208×10 12 Ω.cm at room temperature, respectively. The dielectric constant of the non-accelerated thermally aged CSPE and the accelerated thermally aged CSPE for 40y and 80y were 3.355∼4.030, 2.996∼3.963 and 3.020 ∼4.776 at room temperature, respectively. After seawater and freshwater flooding, the volume electrical resistivity of the CSPE trend slightly upward according to drying day at room temperature. After seawater flooding, the dielectric constant of the accelerated thermally aged CSPE were not measured. After seawater flooding, bright open pores of the accelerated thermally aged CSPE were partly transferred to dark close pores due to salinity. After freshwater flooding, dark close pores of the accelerated thermally aged CSPE were partly transferred to bright open pores because salinity of them is decreased. An insulation property of a cable in NPPs was decreased because of the seawater flooding, and an insulation property of them was recovered through the freshwater flooding. As a result, it is considered that an insulation property of a contaminated cable through Tsunami can be recovered if it is cleaned quickly.

Effects of Freshwater Flooding on the Properties of the Accelerated Thermally Aged CSPE