• 한국압력기기공학회 논문집
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• 제14권2호
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• pp.32-40
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• 2018

Since 2000, the frequency of earthquakes beyond the 5.0 magnitude quake has been increasing in the Korean peninsula. For instance, the 5.0-magnitude earthquake in Baekryong-do in 2003 has occurred, and recent earthquake with Gyeongju(2016) and Pohang(2017) measured respectively magnitude of 5.2 and 5.8 on the Richter scale. As results, the public concern and anxiety about earthquakes are increasing, and therefore it is necessarily required for social infrastructure to reinforce seismic design and energy production facilities directly related to the national economy and security. This study represents the analysis of seismic performance evaluation methodology such as Seismic Margin Assessment (SMA), Seismic Probabilistic Risk Assessment (SPRA), High Confidence Low Probability Failure (HCLPF) in nuclear power plants in order to develop optimal seismic performance improvement. Current methodologies to evaluate nuclear power plants are also addressed. Through review of the nuclear structure evaluation past and current trend, it contributes to be the basis for the improvement of evaluation techniques on the next generation of nuclear power plants.

• 한국항해항만학회지
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• 제41권5호
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• pp.287-296
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• 2017

The Formal Safety Assessment (FSA) is a structured and systematic methodology developed by the IMO, aimed at assessing the risk of vessels and recommending the method to control intolerable risks, thereby enhancing maritime safety, including protection of life, health, the marine environment and property, by using risk analysis and cost-benefit assessment. While the FSA has mostly been applied to merchant vessels, it has rarely been applied to a DP vessel, which is one of the special purpose vessels in the offshore industry. Furthermore, most of the FSA has been conducted so far by using the Fault Tree Analysis tool, even though there are many other risk analysis tools. This study carried out the FSA for safe operation of DP vessels by using the Bayesian network, under which conditional probability was examined. This study determined the frequency and severity of DP LOP incidents reported to the IMCA from 2001 to 2010, and obtained the Risk Index by applying the Bayesian network. Then, the Risk Control Options (RCOs) were identified through an expert brainstorming and DP vessel simulations. This study recommends duplication of PRS, regardless of the DP class and PRS type and DP system specific training. Finally, this study verified that the Bayesian network and DP simulator can also serve as an effective tool for FSA implementation.

• 항공우주시스템공학회지
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• 제16권3호
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• pp.52-62
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• 2022

특정범주 무인항공기 운용의 위험평가를 위해서 개발된 SORA 방법론에서는 지상 및 공중위험 등급을 결정하고 해당 위험도에 대한 특정보증 무결성 수준을 나타내는 SAIL이 할당되어 제안된 운용에 대한 운용 안전도 목표를 적절한 강건도 수준으로 입증해야 한다. 인명의 수송은 제외하는 특정범주 무인항공기 운용의 특성상 지상의 인명이 가장 먼저 고려되어야 하는 위험의 대상이며, 여기서 평가된 지상위험도는 공중위험도와 함께 SAIL의 할당에서도 중요한 역할을 한다. 위험도는 초기에 결정된 등급에 세 가지 종류의 완화수단이 적용되는 것으로 등급이 경감되어 최종 등급이 결정된다. 본 논문에서는 무인항공기의 특정범주 운용에 대한 위험평가 중에서 지상위험 등급의 결정과 완화수단의 적용을 통한 등급의 감소 및 최종 위험 등급에 따른 SAIL과 OSO에 미치는 영향에 대해서 분석하였다.

• 한국지역사회생활과학회지
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• 제15권2호
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• pp.167-177
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• 2004

미생물 위해성 평가 방법론을 이용하여 살모넬라 발생 수를 추정하고, 기존의 연구 결과와 비교하여 그 활용 가능성에 대해 알아보았다. 살모넬라균의 오염수준은 국내에 발표된 각종 문헌(1997∼2000)과 관련 기관의 모니터링 자료(1999∼2001)를 수집하여 추정하였고, 식품 섭취 량은 2001 국민건강영양조사, 용량-반응 모델은 외국에서 발표된 연구 결과를 이용하였다. 각 변수를 시뮬레이션을 통해 추정한 결과 1년 동안 국내에서 발생 가능한 살모넬라 환자 수는 753,368명으로 나타났는데, 이는 보고된 환자수의 약 115배로 WHO의 추정배수보다는 낮은 결과를 보였다. 이상의 결과를 볼 때, 미생물 위해성 평가 방법은 식중독 발생 환자 수를 추정하고 식중독 관리에 있어서의 우선순위를 결정하는 데 이용이 가능한 것으로 보인다. 그러나 아직까지 검증 방법이 확립되어 있지 않고, 식중독균의 오염농도, 식품 섭취량, 용량-반응 관계, 유통ㆍ보관ㆍ조리 등의 실태에 관한 연구가 좀더 필요할 것으로 생각된다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.1425-1432
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• 2011

The various risk assessment methodologies have been introduced in the railway industries. The risk assessment suggested by CENELEC are described with two ways; quantitative and qualitative methods. However, in the industry application level, the quantitative method is hard to apply for a project because of somehow complicated or few statistical figures which was driven from the on-site and the qualitative method is too subject to have the confidence of its results fully. In this paper, the state-of-the-art methods which were suggested in Europe recently are introduced and compared to existing quantitative and qualitative methods. Furthermore, the application measures of railway projects are investigated.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2003년도 춘계학술발표대회 요약집
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• pp.200.2-200.2
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• 2003

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2001년도 추계학술발표회요약집
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• pp.200-200
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• 2001

• 한국환경보건학회지
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• 제44권3호
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• pp.217-226
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• 2018

Objectives: Despite the positive effects of Off-site risk assessment (ORA) system such as prevention of chemical accidents, some problems have been constantly raised. The purpose of this study is to analyze the problems that have occurred through the implementation of the ORA system for the past three years and to suggest reasonable directions for improvement in the future. Methods: In order to identify the problems with the methodology and procedure of ORA system, we analyzed statutes, administrative rules and documents related to the ORA system. A survey of ORA reviewers in National Institute of Chemical Safety was conducted to investigate the weight of determinants considered when judging the level of total risk in ORA. Results: In this study, we found out the uncertainty of the estimation of the number of people in the impact range in the procedure of the risk assessment of individual handling facilities, the lack of quantitative risk analysis methods for environmental receptors, and the ambiguity of the criteria for the total risk. In addition to suggesting solutions to the problems mentioned above, we also, suggested a decision tree for total risk in ORA. Conclusion: We anticipate that the solutions including the systematic decision tree for total risk suggested will contribute to the smooth operation of the ORA system.

• 한국지하수토양환경학회지:지하수토양환경
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• 제20권4호
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• pp.51-65
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• 2015

Indoor inhalation of vapors intruded into buildings is an important exposure pathway in volatile organic compoundscontaminated sites. Site-specifically measured indoor air concentration is preferentially used for risk assessment. However, when indoor air concentration of VOC is not measured, the indoor air concentration needs to be estimated from soil concentration or measured soil gas concentration of the VOC. Some risk assessment guidance (e.g., Korea Ministry of Environment (KMOE) and American Society for Testing and Materials (ASTM) International guidance) estimate the indoor air concentration from soil concentration while other guidances (e.g., United States Environmental Protection Agency (USEPA) and Dutch National Institute for Public Health (RIVM)) estimate it from measured soil gas concentration. This study derived indoor inhalation risks of intruded benzene in two benzene-contaminated residential areas with four different risk assessment guidances (i.e., KMOE, USEPA, ASTM, and Dutch RIVM) and compared the derived risks. The risk assessment results revealed that indoor air estimation approach from soil concentration could either underestimate (when the contaminant is not detected in soil) or overestimate (when the contaminant is detected in soil even at negligible concentration) the indoor air inhalation risk. Hence, this paper recommends to estimate indoor air concentration from soil gas concentration, rather than soil concentration. Discussions about the various indoor air concentration estimation approaches are provided.

• 한국안전학회지
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• 제33권6호
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• pp.102-114
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• 2018

The Railway Safety Management System is based on risk management and the basic purpose of risk management is safety management activities to prevent railway accidents and operational obstacles in advance. In order to manage risk, an acceptable risk standard must be established. This risk criterion is used to evaluate the railway risk with both frequency and severity. In the case of overseas railway or other industrial sectors, various factors are reflected in the main variables that constitute the occurrence frequency, but this is no the case in the domestic railway sector. In particular, the current risk assessment criteria in the railway sector remain at a level that exploits the incidents that have occurred in the past and the severity of the property damage and it dose not properly reflect complex and diverse environmental and situational changes in railway operations. Therefore, in this study, it is possible to calculate the potential occurrence of future events instead of occurrence frequency as a component of the risk assessment criteria, focusing on the High-Speed Railway. In addition to the property damage to the consequence, we suggest a rational methodology, development direction, and theoretical implications for constructing accurate and reasonable risk criteria including actual damage such as human injury and time loss.