• Title/Summary/Keyword: 최적 지진내력 분포

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A Study on Seismic Probabilistic Safety Assessment for a Research Reactor (연구용 원자로에 대한 지진 확률론적 안전성 평가 연구)

  • Oh, Jinho;Kwag, Shinyoung
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.31 no.1
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    • pp.31-38
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    • 2018
  • Earthquake disasters that exceed the design criteria can pose significant threats to nuclear facilities. Seismic probabilistic safety assessment(PSA) is a probabilistic way to quantify such risks. Accordingly, seismic PSA has been applied to domestic and overseas nuclear power plants, and the safety of nuclear power plants was evaluated and prepared against earthquake hazards. However, there were few examples where seismic PSA was applied in case of a research reactor with a relatively small size compared to nuclear power plants. Therefore, in this study, seismic PSA technique was applied to actually completed research reactor to analyze its safety. Also, based on these results, the optimization study on the seismic capacity of the system constituting the research reactor was carried out. As a result, the possibility of damage to the core caused by the earthquake hazard was quantified in the research reactor and its safety was confirmed. The optimization study showed that the optimal seismic capacity distribution was obtained to ensure maximum safety at a low cost compared with the current design. These results, in the future, can expect to be used as a quantitative indicator to effectively improve the safety of the research reactor with respect to earthquakes.

An Analytical Study on the Shape Development of U-shaped Steel Damper for Seismic Isolation System (면진시스템용 U형 강재댐퍼의 형상 개발에 대한 해석적 연구)

  • Quan, Chun-Ri;Oh, Sang-Hoon;Lee, Sang-Ho
    • Journal of Korean Society of Steel Construction
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    • v.22 no.1
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    • pp.43-53
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    • 2010
  • Seismic isolation is one of the most widely implemented and accepted seismic protection systems to limit or avoid damages from unforeseeable earthquakes. As an energy absorption device, however, the supplemental lead itself tends to pollute the environment. Consequently, it is predicted that the use of lead would be controlled. Considering the pollution caused by lead, several researchers are interested in the viability of using steel in place of lead. In this study, first, based on the results of a non-linear finite element analysis, the excellent deformation capacity of a very tough steel damper was demonstrated by comparing it with that of the SS400 damper and determining the effects of main parameters (the aspect ratio, thickness, and width) on the deformation capacity. Second, an optimum shape and design equation for a U-shaped damper with an opening based on stress distribution was suggested.