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Report No.

Radiation and thermal ageing studies of polyvinylchloride used in cable insulation in nuclear power plants

Idesaki, Akira; Seguchi, Tadao*; Tamura, Kiyotoshi; Oshima, Takeshi; Shimada, Akihiko; Kudo, Hisaaki*

The degradation of polyvinylchloride (PVC) used in cable insulation in nuclear power plant was investigated by accelerated thermal and radiation ageing. The sheets of PVC as same formulation as cables were subjected to thermal ageing at temperature range 100-135$$^{circ}$$C and/or to radiation ageing by $$^{60}$$Co $$gamma$$-rays at a dose rate of 1 kGy/h in air. The degradation was evaluated by the tensile test and by the weight change. The relations between elongation at break and change of weight by loss of plasticizer were analyzed. At higher temperature, the plasticizer evaporates to cause the decrease of tensile properties. The study was supported by Nuclear and Industrial Safety Agency (NISA), Japanese Minister of Economy, Trade and Industry (METI).



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