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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.12
- 수록면
- 367 - 373 (7page)
- DOI
- 10.33162/JAR.2019.12.19.4.367
이용수
초록· 키워드
오류제보하기
Purpose: This paper evaluates the effects of heat and gamma radiation on the degradation behavior of fluoroelastomer under the normal and the Design-Basis Event (DBE) environments of a nuclear power plant.
Methods: Accelerated thermal radiation aging and Loss-of-Coolant Accident (LOCA) tests were performed to simulate normal and DBE environments, respectively. Mechanical and thermal degradation caused by heat and radiation were measured by tensile test and thermogravimetric analysis. Molecular structure analysis was conducted through Fourier transformed infrared (FT-IR) spectroscopy.
Results: The mechanical properties were not changed significantly in pre-aging, normal operating conditions. But radiation of the DBE accident environment significantly affected the mechanical properties of fluoroelastomer and molecular structures, such as C = O formation.
Conclusion: The changes in mechanical properties were caused by increased crosslink density. The crosslink density increased due to chemical bonds that were scissioned by irradiation, resulting in the formation of free radicals. FT-IR results showed that C = O and C-O bonds were increased with increasing doses of gamma radiation. Because of the unstable molecular structure generated by reactions between free radicals and scissioned molecular and oxidized chemical bonds, polymeric materials were hardened and decreased in thermal stability as gamma radiation doses increased.
Methods: Accelerated thermal radiation aging and Loss-of-Coolant Accident (LOCA) tests were performed to simulate normal and DBE environments, respectively. Mechanical and thermal degradation caused by heat and radiation were measured by tensile test and thermogravimetric analysis. Molecular structure analysis was conducted through Fourier transformed infrared (FT-IR) spectroscopy.
Results: The mechanical properties were not changed significantly in pre-aging, normal operating conditions. But radiation of the DBE accident environment significantly affected the mechanical properties of fluoroelastomer and molecular structures, such as C = O formation.
Conclusion: The changes in mechanical properties were caused by increased crosslink density. The crosslink density increased due to chemical bonds that were scissioned by irradiation, resulting in the formation of free radicals. FT-IR results showed that C = O and C-O bonds were increased with increasing doses of gamma radiation. Because of the unstable molecular structure generated by reactions between free radicals and scissioned molecular and oxidized chemical bonds, polymeric materials were hardened and decreased in thermal stability as gamma radiation doses increased.
목차
1. 서론
2. 실험
3. 결과 및 토의
4. 결론
References
참고문헌 (14)
참고문헌 신청
Aggarwal, S. K / 2000 / Assessment and management of ageing of major nuclear power plant components important to safety
Charlesby, A. / 1958 / Atomic radiation and polymers / Pergamon Press
Bruce, M. B / 1981 / Radiation effects on organic materials in nuclear plants / Electric Power Research Institute, Inc
1984 / NRC Regulatory Guide 1.89, Environmental qualification of certain electric equipment important to safety for nuclear power plants regulatory / Office of Nuclear Regulatory Research
Ryu, K. H / 2017 / Development of emerging core technique of equipment qualification on design based events and severe accidents of NPPs
Charlesby, A. / 1958 / Atomic radiation and polymers / Pergamon Press
Bruce, M. B / 1981 / Radiation effects on organic materials in nuclear plants / Electric Power Research Institute, Inc
1984 / NRC Regulatory Guide 1.89, Environmental qualification of certain electric equipment important to safety for nuclear power plants regulatory / Office of Nuclear Regulatory Research
Ryu, K. H / 2017 / Development of emerging core technique of equipment qualification on design based events and severe accidents of NPPs
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