• Title/Summary/Keyword: Accidents Scenario

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Analysis of a Naval Warship Accident and Related Risk (해군함정 사고사례 및 위험도 분석에 관한 연구)

  • Shin, Daewoon;Park, Youngsoo;Choi, Kwang-young;Park, Sangwon
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.24 no.7
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    • pp.863-869
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    • 2018
  • Due to recent changes in the maritime traffic environment, naval warship accidents are constantly occurring. Especially in 2017, serious loss of life was caused by a US navy destroyer accident. The purpose of this study is to analyze the characteristics of naval warship accident cases and construct an accident scenario by using naval training materials, adjudication of naval warship accidents and US navy destroyer accident reports. Based on the surveyed data, the status of accidents was identified and cases were analyzed. We reproduced 17 accident cases in accordance with accident reproduction procedure and constructed naval warship accident scenarios. As a result of analyzing the CPA, TCPA and PARK model for risk, reproducing 17 naval ship accident cases, collision risk increased on average 5-6 minutes before an accident. The result of this study represents basic data for naval and simulation education materials, contributing to the prevention of marine accidents.

Development of a Railway Accident Scenario Analysis Technique using a Preliminary Hazard Analysis(PHA) and a Quality Function Deployment(QFD) (예비위험분석기술(PHA)과 품질기능전개(QFD) 기법을 이용한 철도사고 시나리오 분석기술 개발)

  • Park Chan-Woo;Kwak Sang-Log;Wang Jong-Bae;Hong Seong-Ho;Park Joo-Nam
    • Proceedings of the KSR Conference
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    • 2005.05a
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    • pp.151-156
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    • 2005
  • The objective of this study is to devise an accident scenario analysis method adept at creating accident scenarios at the Preliminary Hazard Analysis(PHA) step of a hazard analysis for railway system. This approach was inspired by the Quality Function Deployment(QFD) method, which is conventionally used in quality management and was used at the systematic accident scenario analysis(SASA) for the design of safer products. In this study, the QFD provides a formal and systematic schema to devise accident scenarios while maintaining objective. The accident scenario analysis method first identifies the hazard factors that cause railway accidents and explains the situation characteristics surrounding the accident. This method includes a feasibility test, a clustering process and a pattering process for a clearer understanding of the accident situation. Since this method enables an accident scenario analysis method to be performed systematically as well as objectively, this method is useful in building better accident prevention strategies. Therefore, this study can serve to reduce railway accident and be an effective tool for a hazard analysis.

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Analysis of Control Element Assembly Withdrawal at Full Power Accident Scenario Using a Hybrid Conservative and BEPU Approach

  • Kajetan Andrzej Rey;Jan Hruskovic;Aya Diab
    • Nuclear Engineering and Technology
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    • v.55 no.10
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    • pp.3787-3800
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    • 2023
  • Reactivity Initiated Accident (RIA) scenarios require special attention using advanced simulation techniques due to their complexity and importance for nuclear power plant (NPP) safety. While the conservative approach has traditionally been used for safety analysis, it may lead to unrealistic results which calls for the use of best estimate plus uncertainty (BEPU) approach, especially with the current advances in computational power which makes the BEPU analysis feasible. In this work an Uncontrolled Control Element Assembly (CEA) Withdrawal at Full Power accident scenario is analyzed using the BEPU approach by loosely coupling the thermal hydraulics best-estimate system code (RELAP5/SCDAPSIM/MOD3.4) to the statistical analysis software (DAKOTA) using a Python interface. Results from the BEPU analysis indicate that a realistic treatment of the accident scenario yields a larger safety margin and is therefore encouraged for accident analysis as it may enable more economic and flexible operation.

Analysis of Hydrogen Accident in Korea (국내 수소사고사례 분석)

  • Jo, Young-Do;Tak, Song-Su;Choi, Kyoung-Suhk;Lee, Jong Rark;Park, Kyo-Shik
    • Transactions of the Korean hydrogen and new energy society
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    • v.15 no.1
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    • pp.82-87
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    • 2004
  • Hydrogen is considered to be the most important future energy carrier in many applications reducing greenhouse gas emissions significantly. To be applicable as energy carrier the safety issues associated with hydrogen applications needs to be investigated and fully understood. In order to analyze the risks associated with hydrogen applications, accidents associated with hydrogen in Korea from 1963 to 2002 have been analysed in this work. From analysis of accidents, we propose the necessity of research on hydrogen releases, dispersion in air, and explosion due to high hazardous of hydrogen.

Role & Responsibility of Emergency Response Workers against KTX Person's Injury Accidents (고속철도 사상사고 시 비상대응직원의 레벨별 역할과 책임에 관한 연구)

  • Park, Min-Kyu;Kim, Si-Gon
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.1236-1245
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    • 2008
  • Recently the Emergency Response is very important issue in Korea because there are lots of damage of people and property. In this paper, we have studied person's injury related to emergency action to minimize the damage on KTX. We defined what Activities of the emergency response workers should take when the Person's injury occurs on the railway. This has been possible through the development of the scenario that is focused on the person's injury accident. We considered all kinds of environment of KTX related to emergency action of person's injury accidents. Finally, we developed the role and responsibility of emergency response workers against KTX person's injury accidents.

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Development of Risk Evaluation Models for Railway Casualty Accidents (철도사상 사고위험도 평가 모델 개발에 관한 연구)

  • Park, Chan-Woo;Kim, Min-Su;Wang, Jong-Bae;Choi, Don-Bum
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.1499-1504
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    • 2008
  • This study shows risk-based evaluation results of casualty accidents for passengers, railway staffs and MOP(Member of public) on the national railway in South Korea. To evaluate risk of these accidents, the hazardous events and the hazardous factors were identified by the review of the accident history and engineering interpretation of the accident behavior. A probability evaluation model for each hazardous event which was based on the accident appearance scenario was developed by using the Fault Tree Analysis (FTA) technique. The probability for each hazardous event was evaluated from the historical data and structured expert judgment. In addition, the severity assessment model utilized by the Event Tree Analysis (ETA) technique was composed of the accident progress scenarios. And the severity for the hazardous events was estimated using fatalities and weighted injuries. The risk assessment model developed can be effectively utilized in defining the risk reduction measures in connection with the option analysis.

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An economic feasibility analysis of the reduction of accident at fishing operation in stow net fishery (안강망어업 작업 중 안전사고 저감의 경제적 효과 분석)

  • KIM, Do-Hoon;YI, Ju-Hyun;LEE, Yoo-Won
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.56 no.3
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    • pp.258-264
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    • 2020
  • This study aimed to analyze the economic feasibility of the reduction of working safety accidents in stow net fishery through the prevention education to fishing crews. The benefit was evaluated by estimating insurance payment amount that was reduced through prevention education. The decreasing rate of working safety accidents was presumed to follow the experience in Japan. The cost was assumed as the cost of textbook development. Results indicated that IRR was estimated to be 79.9% in case of scenario assuming no additional operating costs while IRR was 56.3% in case of scenario assuming 10% additional operating costs. In addition, the economic feasibility would be secured when annual operating costs increased to 274 million won according to the result of sensitivity analysis.

A Study on Evaluation Method of the Adaptive Cruise Control (ACC 차량의 시험평가 방법에 대한 연구)

  • Kim, Bong Ju;Lee, Seon Bong
    • Journal of Drive and Control
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    • v.14 no.3
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    • pp.8-17
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    • 2017
  • With automobiles sharply increasing in numbers worldwide, we are faced with critical social issues such as traffic accidents, traffic jams, environmental pollution, and economic inefficiency. In response, research on ITS is promoted mainly by regions with advanced automotive industry such as the U.S., Europe, and Japan. While Korea is working on moving forward in the global market through developing and turning to global standards systems related to ASV (Advanced Safety Vehicle), the country is not fully prepared for such projects. The purpose of ACC (Adaptive Cruise Control) is to control a vehicle's longitudinal speed and distance and minimize driver workload. Such a system should be valuable in preventing accidents, as it reduces driver workload in the 21st-century world of telematics created by development of the automobile culture industry. In this light, the thesis presents a method to test and evaluate ACC system and a mathematical method to assess distance. For the proposed test and evaluation, theoretical values are tested with vehicle test and a database is acquired, by using vehicles equipped with an ACC system. Theoretical evaluation criteria for developing ACC system may be used and scenario-specific evaluation methods may find useful application through testing the formula proposed by comparing the database and mathematical method.

Emergency Evacuation Scenario Study of Urban Metro Vehicle Running on Elevated Guideway (도시철도차량의 고가선로 비상대피 시나리오 분석)

  • Kim, Young-Sang;Maeng, Hee-Young;Wang, Jong-Bae
    • Journal of the Korean Society of Safety
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    • v.27 no.3
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    • pp.117-124
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    • 2012
  • There have been recently introduced new types of urban metro vehicles called LRT (Light Rail Transit) running on elevated guideway such as Uijeongbu VAL(which stands for V$\acute{e}$hicule Automatique L$\acute{e}$ger: Automatic Light Rail Vehicle) system, Yong-In LIM(Linear Induction Motor) system, Incheon international airport MAGLEV(Magnetic Levitated Vehicle) system and Daegu monorail system. Most of accidents by the vehicles are bound to happen on elevated guideway. Therefore, it is of vital importance to analyze hazards related to vehicles running on elevated guideway and study emergency evacuation scenarios applicable in case of accidents on elevated guideway so as to secure the safety of the new types of urban metro vehicles. In this study, FTA(Fault Tree Analysis) model was developed to identify all possible hazards, and all possible evacuation scenarios were studied. It was also confirmed that each hazard can be corresponded to one or more evacuation scenarios. This result shows that passengers can be evacuated according to one of the scenarios identified in this study in case of an accident of "Train Stranded on Elevated Guideway".

Human and organizational factors for multi-unit probabilistic safety assessment: Identification and characterization for the Korean case

  • Arigi, Awwal Mohammed;Kim, Gangmin;Park, Jooyoung;Kim, Jonghyun
    • Nuclear Engineering and Technology
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    • v.51 no.1
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    • pp.104-115
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    • 2019
  • Since the Fukushima Daiichi accident, there has been an emphasis on the risk resulting from multi-unit accidents. Human reliability analysis (HRA) is one of the important issues in multi-unit probabilistic safety assessment (MUPSA). Hence, there is a need to properly identify all the human and organizational factors relevant to a multi-unit incident scenario in a nuclear power plant (NPP). This study identifies and categorizes the human and organizational factors relevant to a multi-unit incident scenario of NPPs based on a review of relevant literature. These factors are then analyzed to ascertain all possible unit-to-unit interactions that need to be considered in the multi-unit HRA and the pattern of interactions. The human and organizational factors are classified into five categories: organization, work device, task, performance shaping factors, and environmental factors. The identification and classification of these factors will significantly contribute to the development of adequate strategies and guidelines for managing multi-unit accidents. This study is a necessary initial step in developing an effective HRA method for multiple NPP units in a site.