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Ethylene propylene rubber insulations under operation for 16 years in boiling water reactor containments were subjected to additional thermal aging at 110°C. 70 days were needed to decrease their mechanical property to the limit that they cannot secure the durability against design-basis events. This degradation rate is found to be three times slower than that predicted on the basis of an accelerated...
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...
The polyaniline (PANI) film deposition during the oxidative polymerization of aniline was studied using the quartz crystal microbalance (QCM) technique. PANI was prepared in the presence and absence of PDAs (p-phenylenediamine (PPDA), o-phenylenediamine (OPDA) and m-phenylenediamine (MPDA)). The effect of PDAs concentrations on the PANI films formation were monitored using QCM technique. It was found...
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