• Title/Summary/Keyword: 위험도평가

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Risk Assessment Technology of LNG Plant System (액화천연가스 플랜트 시스템 위험도평가 기술)

  • Choi, Song-Chun;Ha, Je-Chang;Lee, Mee-Hae;Jo, Young-Do;Chang, Yoon-Suk;Choi, Shin-Beom;Choi, Jae-Boong
    • Journal of the Korean Society for Nondestructive Testing
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    • v.29 no.2
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    • pp.162-170
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    • 2009
  • As one of promising solutions to overcome high oil price and energy crisis, the construction market of high value-added LNG plants is spotlighted world widely. The purpose of this manuscript is to introduce domestic activities to develop risk assessment technology against overseas monopolization. After analyzing relevant specific features and their technical levels, risk assessment program, non-destructive reliability evaluation strategy and safety criteria unification class are derived as core technologies. These IT-based convergence technologies can be used for enhancement of LNG plant efficiency, in which the modular parts are related to a system with artificial optimized algorithms as well as diverse databases of facility inspection and diagnosis fields.

Case Study on Risk Assessment of Railway Infrastructure Sections Using Acceptable Risk Matrix (위험도 매트릭스를 활용한 철도시설물 구간 위험도평가의 사례연구)

  • Shin, Duck-ho;Park, Chan-woo;Chae, Eunkyung;Lee, June-Seok
    • Journal of the Korean Society for Railway
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    • v.20 no.4
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    • pp.550-557
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    • 2017
  • Owing to the established international standards for reliability and safety management of railways and the third-part conformity assessment implementation, quantitative risk assessment focusing on communication system related to railway safety has being implemented. The quantitative risk assessment starts from the establishment of quantitative RAMS requirements; the risk has to be maintained under an acceptable safety level. This paper introduces the risk assessment process based on international standards ; risk assessment was conducted using failure data for railway facilities for about 5.5 years. In addition, based on the results, a scientific risk management method for railway facilities is suggested.

A Study on the Modeling of PoF Estimation for Probabilistic Risk Assessment based on Bayesian Method (확률론적 위험도평가를 위한 베이지안 기반의 파손확률 추정 모델링 연구)

  • Kim, Keun Won;Shin, Dae Han;Choi, Joo-Ho;Shin, KiSu
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.41 no.8
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    • pp.619-624
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    • 2013
  • To predict the probabilistic service life, statistical factors should be included to consider the uncertainty of parameters. Generally the probabilistic analysis is one of the common methods to account the uncertainty of parameters on the structural failure. In order to apply probabilistic analysis on the deterministic life analysis, it would be necessary to introduce Probability of Failure(PoF) and conduct risk assessment. In this work, we have studied probabilistic risk assessment of aircraft structures by using PoF approach. To achieve this goal, the Bayesian method was utilized to model PoF estimation since this method is known as the proper method to express the uncertainty of parameters. A series of proof tests were also conducted in order to verify the result of PoF estimation. The results from this efforts showed that the PoF estimation model can calculate quantitatively the value of PoF. Furthermore effectiveness of risk assessment approach for the aircraft structures was also demonstrated.

Suggestion of Risk Assessment Methodology for Decommissioning of Nuclear Power Plant (원자력발전소 해체 위험도 평가 방법론 개발)

  • Park, ByeongIk;Kim, JuYoul;Kim, Chang-Lak
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.17 no.1
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    • pp.95-106
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    • 2019
  • The decommissioning of nuclear power plants should be prepared by quantitative and qualitative risk assessment. Radiological and non-radiological hazards arising during decommissioning activities must be assessed to ensure the safety of decommissioning workers and the public. Decommissioning experiences by U.S. operators have mainly focused on deterministic risk assessment, which is standardized by the U.S. Nuclear Regulatory commission (NRC) and focuses only on the consequences of risk. However, the International Atomic Energy Agency (IAEA) has suggested an alternative to the deterministic approach, called the risk matrix technique. The risk matrix technique considers both the consequence and likelihood of risk. In this study, decommissioning stages, processes, and activities are organized under a work breakdown structure. Potential accidents in the decommissioning process of NPPs are analyzed using the composite risk matrix to assess both radiological and non-radiological hazards. The levels of risk for all potential accidents considered by U.S. NPP operators who have performed decommissioning were estimated based on their consequences and likelihood of events.

Assessment of Ship Navigation Risk for Optimal Allocation of Virtual Aids to Navigation (가상항로표지 최적 배치를 위한 항해 위험도 평가)

  • Song, Eun-a;Kim, Kwang-il;Jo, Gi-jong
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.68-69
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    • 2020
  • 해상에서는 선박의 안전한 항해를 위해 각종 항로 표지가 이용되는데, 과학 기술이 발전함에 따라 환경적 요소 등의 이유로 항로표지를 설지 할 수 없는 지역에서는 가상항로 표지를 필요로 하고 있다. 선행연구에서는 가상항로 표지의 최적 배치를 위해 선박 항해의 물리적 항해 제한 및 항해 장애물요소, 선박 교통 위험도 등을 격자 단위로 파악하였다. 이에 본 연구는 격자별로 나눈 해역의 위험도 지수를 통합하여 통합 위험도 평가 지수를 개발하고자 한다. 이에 요소별 가중치를 설정하고, 레이어를 통합한 뒤 위험도를 산정하여 통계데이터 기반 위험도를 평가하였다. 요소별 가중치 설정을 위해 위험도 레이어 통합 가중치를 설정하였으며, 실제 해역에 적용하여 위험도를 평가하였다.

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한국형이네비게이션의 최적안전항로서비스를 위한 충돌위험도평가모델 연구

  • Jeon, Ho-Gun;Jeong, Yeon-Cheol
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.13-15
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    • 2017
  • 지난 50년 동안 우리나라 근해의 해양사고통계에 따르면 해양사고의 36%가 선박충돌사고로 나타나고 있고 이로 인해 막대한 재산피해, 인명손실 및 환경피해가 발생되고 있다. 한국형이네비게이션사업은 우리나라 근해에서 발생하는 이러한 해양사고를 획기적으로 줄이기 위한 것으로 현재 연구가 진행중이다. 본 연구는 한국형이네비게이션의 최적안전항로서비스에 필요한 충돌위험도평가모델을 개발하는 것이 목적이다. 개발된 충돌위험도평가모델은 과거의 AIS 데이터를 기반으로 주어진 항로의 충돌위험도를 계산한다. 모델의 계산 및 결과를 도시하기 위해 MATLAB 및 MATLAB 기반의 M-Map 패키지가 사용되었다. 개발된 모델의 검증을 위해 정상작동 여부를 확인하기 위한 시험해역 적용과 현장 적용성을 검토하기 위한 실해역 적용이 각각 수행되었으며 그 유용성을 확인할 수 있었다.

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