• Journal of Advanced Research in Ocean Engineering
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• 제3권3호
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• pp.125-135
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• 2017

The paper considers the practical application of the FMEA(Failure Mode and Effect Analysis) method to assess the operational reliability of the LNG(Liquefied Natural Gas) transfer system, which is a potential problem for the connection between the LNG FPSO and LNG carrier. Hazard Identification (HAZID) and Hazard operability (HAZOP) are applied to identify the risks and hazards during the operation of LNG transfer system. The approach is performed for the FMEA to assess the reliability based on the detection of defects typical to LNG transfer system. FTA and FMEA associated with a probabilistic risk database to the operation scenarios are applied to assess the risk. After providing an outline of the safety assessment procedure for the operational problems of system, safety assessment example is presented, providing details on the fault tree of operational accident, safety assessment, and risk measures.

• 한국안전학회지
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• 제24권5호
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• pp.13-20
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• 2009

The risk assessment of thermal hazard to identify chemical or process hazard during early process developments have been considered. The early identification of thermal hazards associated with a process, such as rapid heats of reaction, exothermic decompositions, and the potential for thermal runaways before any large scale operations are undertaken. This paper presents to evaluate the safe operating parameters/envelope for exist plant operations. The assessment of thermal hazard with operating conditions such as amount of process materials, inhibitor, and catalyst on esterification process in manufacture of concrete mixture agents are described. The experiments were performed by a sort of calorimetry with the Multimax reactor system as a screening tool. The aim of the study was to evaluate the thermal risk of process material and mixture in terms of safety security to be practical applications in esterification process. It suggested that we should provide the thermal hazard of reaction materials to present safe operating conditions with cause of accident through this study.

• Geomechanics and Engineering
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• 제35권6호
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• pp.581-591
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• 2023

North Anatolian Fault Zone is tectonically active with recent earthquakes (Mw7.6 1999-Kocaeli and Mw7.2 1999-Düzce earthquakes) and it passes through Marmara region, which is highly industrialized, densely populated and economically important part of Turkey. Many power plants, located in Marmara region, are exposed to high seismic hazard. In this study, open source OpenQuake software has been used for the probabilistic earthquake hazard analysis of Marmara region and risk assessment for the specified energy facility. The SHARE project seismic zonation model has been used in the analysis with the regional sources, NGA GMPEs and site model logic trees. The earthquake hazard results have been compared with the former and existing earthquake resistant design regulations in Turkey, TSC 2007 and TBSCD 2018. In the scope of the study, the seismic hazard assessment for a typical natural gas combined cycle power plant located in Marmara region has been achieved. The seismic risk assessment has been accomplished for a typical control building located in the power plant using obtained seismic hazard results. The structural and non-structural fragility functions and a consequence model have been used in the seismic risk assessment. Based on the seismic hazard level with a 2% probability of exceedance in 50 years, considered for especially these type of critical structures, the ratios of structural and non-structural loss to the total building cost were obtained as 8.8% and 45.7%, respectively. The results of the study enable the practical seismic risk assessment of the critical facility located on different regions.

• 터널과지하공간
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• 제17권4호
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• pp.322-331
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• 2007

산악지형이 우세한 강원도 지역 내 도로 및 철도 노선에는 수많은 암반 절개 사면들이 존재하며 이들 사면들은 각각 담당 기관별로 유지관리되고 있다. 사면의 위험도를 평가할 때 모든 암반사면에 대한 정밀조사를 수행하기에는 전문 인력과 예산 면에서 거의 불가능하다. 이러한 암반사면의 효율적 관리를 위해서는 1단계로 현장 실무자가 암반사면의 위험도를 개략적으로 평가하여 암반사면의 기본적인 정보를 관리하는 한편, 이를 바탕으로 위험사면을 선정하여 전문가에 의해 후속 정밀조사를 실시하도록 하는 2단계 평가가 필요하다. 이를 위해 본 연구에서는 기존 문헌 조사 및 전문가에 의한 정밀현장조사와 분석을 통하여 현장실무자가 손쉽게 사용할 수 있도록 단순화된 암반사면위험도평가법을 개발하였으며 전문가에 의한 현장적용을 통해 타당성을 검토하였다. 개발된 KSMR은 적은 평가항목에도 불구하고 SMR을 대체할 수 있는 것으로 나타났다. 또한 KSMR에 의한 평가시 사면높이를 고려한 결과 전문가에 의한 위험도평가등급과의 오차가 약간 감소하는 것으로 나타났다.

• 한국안전학회지
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• 제15권4호
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• pp.112-118
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• 2000

This paper is resulted from the research to activate Self-control Safety Management system that adopted to improve an assessment system for Hazard Prevention Plan. And members of company, university and research institute have jointly participated in the research. First, it is investigated that introduced background and processing method with existing practical data & materials references in order to understand what domestic Self-control Safety Management system will be available for. And general construction company at site have their ability to assess Hazard Prevention Plan by mailing questionnaire to on thousand site, visits, and interviews. Also, It is investigated how much they have the assessment ability. It is selected to do a questionnaire survey for the status of self-regulatory safety assessment ability of the designated self-regulatory companies in order to produce and enhance the self-regulatory assessment ability and the necessity of Self-control Safety Management system. Finally, it is selected to do a questionnaire survey for fixing and the enhance Self-control Safety Management system of general construction contractors.

• Nuclear Engineering and Technology
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• 제50권8호
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• pp.1372-1386
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• 2018

Despite recent advances in multi-hazard analysis, the complexity and inherent nature of such problems make quantification of the landslide effect in a probabilistic safety assessment (PSA) of NPPs challenging. Therefore, in this paper, a practical approach was presented for performing an earthquake-induced landslide PSA for NPPs subject to seismic hazard. To demonstrate the effectiveness of the proposed approach, it was applied to Korean typical NPP in Korea as a numerical example. The assessment result revealed the quantitative probabilistic effects of peripheral slope failure and subsequent run-out effect on the risk of core damage frequency (CDF) of a NPP during the earthquake event. Parametric studies were conducted to demonstrate how parameters for slope, and physical relation between the slope and NPP, changed the CDF risk of the NPP. Finally, based on these results, the effective strategies were suggested to mitigate the CDF risk to the NPP resulting from the vulnerabilities inherent in adjacent slopes. The proposed approach can be expected to provide an effective framework for performing the earthquake-induced landslide PSA and decision support to increase NPP safety.

• Spatial Information Research
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• 제23권2호
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• pp.39-48
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• 2015

본 연구에서는 2차원 범람해석을 통해 도출된 침수해석정보에 현실적인 위험도를 고려한 산정식을 적용하여 홍수위험도를 평가하였고, 이를 표준화된 정보체계로 제공하는 방안을 제시하였다. 일반적으로 침수심과 침수구역을 기반으로 하는 현재의 홍수위험도 평가방법은 홍수발생시 사람에게 미치는 실질적인 위험도를 충분히 반영하지 못 할 것으로 판단되어 침수심, 유속, Debris Factor와 Flood Hazard Rating 관계식을 이용하여 외수범람이 사람에게 미치는 홍수위험도를 평가하고 4개로 등급화하였다. 이를 위해 2차원 외수범람해석 모형인 Flumen을 이용하여 대구의 금호강유역 대하여 500년 빈도 홍수로 인한 월류와 200년 빈도 홍수로 인한 파제 시나리오에 따라 외수범람을 모의하였다. 이러한 연구결과를 통해 외수범람시 침수가 예상되는 지역에 위치한 사람들에게 더 현실적인 위험도정보를 제공하고, 표준화된 정보체계 기반에서 위험도정보 제공이 가능해짐으로써 재해관련분야의 정보분석, 평가, 계획수립 등 다양한 분야에서 활용성을 증대시킬 수 있을 것으로 판단된다.

• 한국방재학회 논문집
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• 제10권4호
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• pp.135-144
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• 2010

전국적으로 생태하천에 대한 관심이 높아져가고 있는 현실에서 각 지역마다 생태하천 구성을 위한 계획들이 수립되어 시행되고 있다. 생태하천의 구성을 위해서는 하천에서의 유지용수 확보가 가장 큰 문제가 되고 있으나 이의 산정을 위한 많은 연구들이 있었음에도 불구하고 실제 유지유량의 산정에서는 연구자들마다 서로 다른 견해를 나타내고 있어 기존의 유지유량 산정법에 각 지자체들의 필요를 고려한 유지유량 산정방법을 연구하였다. 하천의 갈수량에 수질보존 및 생태계보존, 필요수량을 고려하던 기존의 유지용수 확보방안에 대하여 하천경관 및 수질수준 만족여부 조사 등 지자체 요구사항을 포함할 수 있는 유지용수산정법을 대전광역시 유지용수 확보사업에 비교하여 적용하였으며, 이를 통하여 대전광역시의 유지용수 확보사업의 타당성을 같이 제시할 수 있었다.

• Structural Monitoring and Maintenance
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• 제7권1호
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• pp.59-67
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• 2020

This study aims to develop the fuzzy risk assessment model of the debris flow to verify the accuracy of risk assessment in order to help related organizations reduce losses caused by landslides. In this study, actual cases of landslides that occurred are utilized as the database. The established models help us assess the occurrence of debris flows using computed indicators, and to verify the model errors. In addition, comparisons are made between the models to determine the best one to use in practical applications. The results prove that the risk assessment model systems are quite suitable for debris flow risk assessment. The reproduction consequences of highlight point discovery are shown in highlight guide coordinating toward discover steady and coordinating component focuses and effectively identified utilizing these two systems, by examining the variety in the distinguished highlights and the element coordinating.

• 대한안전경영과학회지
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• 제19권4호
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• pp.53-62
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• 2017

It has come to attention that a risk-assessing organization, that will benchmark a company's safety department, is imperative, following an increase in large-scale SOC-business project, construction of higher-raised buildings, development of underground space; all that have increase accident rates. Having faced problems that arise in firms that demand diversity, complexity and instantaneity, the purpose of the thesis is to arrive at efficient and practical problem-solving means. In order to solve the problems that would surface theoretically during an actual risk assessment, the state of the operation systems of the top five national construction firms having a hazard rate of 0.25 times less than the average rate have been analyzed, while a hierarchal recognition research of the employees who not only function at the operating level but are the practice subjects of a firm, has also been conducted, bringing the main text.