Comparative study on degradation of ethylene-propylene rubber for nuclear cables from gamma and beta irradiation |
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| Institution: | 1. Department of Materials Science, Fudan University, Shanghai 200433, PR China;2. Shanghai Nuclear Engineering Research & Design Institute (SNERDI), Shanghai 200233, PR China;3. Shanghai Institute of Process Automation Instrumentation (SIPAI), Shanghai 200233, PR China;1. Center for Advanced Materials, Qatar University, PO Box 2713, Doha, Qatar;2. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovského nám. 2, 162 06 Praha, Czechia;1. Department of Mechanical Engineering, Faculty of Engineering of Bilbao, University of the Basque Country (UPV/EHU), Rafael Moreno “Pitxitxi” 2-3, 48013 Bilbao, Spain;2. Department of Mining, Metallurgy and Science of Materials, Faculty of Engineering of Bilbao, University of the Basque Country (UPV/EHU), Rafael Moreno “Pitxitxi” 2-3, 48013 Bilbao, Spain;3. Materials Testing and Simulation, Leartiker (Lea-Artibai Development Center), Xemein Avenue 12-A, 48270 Markina, Xemein, Spain;1. Department of Wood Science and Technology, Faculty of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran;2. Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), P.O. Box 15815-3538, Tehran, Iran |
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| Abstract: | Considering safety is the priority concern of nuclear power plants, equipment qualification testing of the nuclear components manufactured should be paid special attention to. Thereinto, equivalent conversion (1:1) from the absorbed beta doses to gamma doses is a rule of thumb for irradiation qualification testing of the polymers used as nuclear cables, however whether it is reasonable and applicable to Chinese domestic polymers still requires investigation. In this paper, both gamma and beta irradiation testing with the actual dose rates and total absorbed doses in China Advanced Passive (CAP) series nuclear power plant was performed upon one domestically manufactured ethylene-propylene rubber intended for nuclear cable insulation in China. The mechanical and the electrical properties before and after irradiation were measured to compare the extent and the trend of degradation between the two irradiation types, and related oxidation degradation mechanism especially its attenuation along the thickness was quantitatively addressed. |
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| Keywords: | Gamma irradiation Beta irradiation Ethylene-propylene rubber Cable insulation Nuclear power plants |
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