Nuclear Engineering and Technology

  • 제54권12호
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  • Pages.4514-4521
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  • 2022
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Effects of heat and gamma radiation on the degradation behaviour of fluoroelastomer in a simulated severe accident environment

  • Inyoung Song (Department of Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST)) ;
  • Taehyun Lee (Department of Reliability Assessment, Mechanical System Safety Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Kyungha Ryu (Department of Reliability Assessment, Mechanical System Safety Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Yong Jin Kim (Department of Ultra-Precision Machines and Systems, Advanced Manufacturing Systems Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Myung Sung Kim (Department of Ultra-Precision Machines and Systems, Advanced Manufacturing Systems Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Jong Won Park (Department of Reliability Assessment, Mechanical System Safety Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Ji Hyun Kim (Department of Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST))
  • 투고 : 2022.04.20
  • 심사 : 2022.08.08
  • 발행 : 2022.12.25
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초록

In this study, the effects of heat and radiation on the degradation behaviour of fluoroelastomer under simulated normal operation and a severe accident environment were investigated using sequential testing of gamma irradiation and thermal degradation. Tensile properties and Shore A hardness were measured, and thermogravimetric analysis was used to evaluate the degradation behaviour of fluoroelastomer. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy were used to characterize the structural changes of the fluoroelastomer. Heat and radiation generated in nuclear power plant break and deform the chemical bonds, and fluoroelastomer exposed to these environments have decreased C-H and functional groups that contain oxygen and double bonds such as C-O, C=O and C=C were generated. These functional groups were formed by auto oxidation by reacting free radicals generated from the cleaved bond with oxygen in the atmosphere. In this auto oxidation reaction, crosslinks were generated where bonded to each other, and the mobility of molecules was decreased, and as a result, the fluoroelastomer was hardened. This hardening behaviour occurred more significantly in the severe accident environment than in the normal operation condition, and it was found that thermal stability decreased with the generation of unstable structures by crosslinking.

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과제정보

This work was supported by the Korea Institute of Machinery & Materials (KIMM) (NK238C) and the Ministry of Oceans and Fisheries (MOF) (No. 20220603).

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