• Title/Summary/Keyword: Facility risk

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Cases Study of Accidents in High Risk Organizations by System Dynamics (시스템 다이내믹스 기법을 활용한 고위험 조직 사고 사례 분석)

  • Oh, Youngmin;Ryu, Jin
    • Korean System Dynamics Review
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    • v.16 no.3
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    • pp.5-29
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    • 2015
  • The importance of the concept of safety culture has increased in the security of high-risk facility after Chernobyl accident in 1986. This paper elaborated the concept of safety culture and its main factors by Causal Loop Diagram. Due to the decline of safety culture, the occurrence of incidents and accidents require more and more corrective actions to the members of high-risk facilities and thereby increasing their workloads. Employees who must complete the task within the given time have to have time pressures and don't comply with the rules and procedures. Also, a schedule pressure is a big stress for employees, causing mistakes in precision work. In order to improve these problems, CLD of the safety culture in this paper suggests hiring more workers, re-allocation of given workloads and strengthen the learning, communication capabilities and safety leadership. In addition, the two real accident cases were analyzed to test the feasibility of the System Dynamic simulation model through the process of structuring the fault trees on the stationary black out accident in Kori unit 1 in South Korea and Kleen Energy power station explosion in US. The simulation results show that the various safety factors cause the serious accident combined with mechanical failure and safety culture will reduce the possibility of the accidents in these high-risk organizations. This simulation model can contribute to analyzing the impact of the organizational and human factors of safety culture and can provide the alternatives in high-risk facilities.

Earthquake hazard and risk assessment of a typical Natural Gas Combined Cycle Power Plant (NGCCPP) control building

  • A. Can Zulfikar;Seyhan Okuyan Akcan;Ali Yesilyurt;Murat Eroz;Tolga Cimili
    • Geomechanics and Engineering
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    • v.35 no.6
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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.

Determining of an Optimal Spares Stocking Policy with Reliability Improvement

  • Jun Hong Kim
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.23 no.56
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    • pp.1-8
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    • 2000
  • We present in this paper an optimal stocking policy for a repairable inventory system under reliability improvement. For this purpose we illustrate commercial flight lines with a large number of planes. This model is supported by a central repair facility. For modeling the nonstationary M/M/s system we implemented SIMAN for computing the time dependent number of units in the repair facility with any number of units. In this model we provide the required inventory level at each location. 1y month. for various levels of associated stock-out risk.

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Development of Risk-Based Inspection(RBI) Technology for LNG Plant Based on API RP581 Code (API RP 581 Code를 기반으로한 LNG 플랜트의 Risk-Based Inspection(RBI) 기술 개발)

  • Choi, Song-Chun;Choi, Jae-Boong;Hawang, In-Ju
    • Corrosion Science and Technology
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    • v.11 no.5
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    • pp.179-183
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    • 2012
  • 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 study is to introduce LNG-RBI system to develop risk assessment technology with RAM(Reliability, Availability, Maintainability) modules 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.

A Study on the Application of Fire Risk Assessment Index on the Wooden Cultural Properties -focused on buddhist temples- (목조 건축문화재의 화재위험도 평가지표 및 활용방안 연구 -사찰 건축물을 중심으로-)

  • Kang, Seok-Jin;Ko, Myong-Hwan;Kim, Dong-Jin
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.7
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    • pp.3550-3561
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    • 2013
  • The purpose of this study was to propose the categorized checklist for fire risk assessment on the wooden cultural properties and to carry out field survey. The survey checklist was composed of categories such as management and administration measures(management, training and countermeasure), architectural planning measures(site plan and facility plan), and equipment measures(fire-fighting and crime prevention facility). In this study, the field survey was carried out in the Nae-jang-sa and Wha-um-sa and it was found that there were some problems in the items which were assessed importantly by experts.

Offsite Risk Assessment on Toxic Release (독성물질 저장설비의 사고시 사업장외에 미치는 영향평가)

  • Park, Kyoshik
    • Journal of the Korean Institute of Gas
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    • v.21 no.3
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    • pp.9-16
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    • 2017
  • Toxic release is one of the most interested area in evaluating consequence to the vicinity of industry facilities handling hazardous materials. Chloric acid production facility is selected and toxic release is evaluated to assess the risk impacted to its off-site. Accident scenarios were listed using process safety information. The scenarios having effect to the off-site were selected and assessed further according to guideline provided by Korea government. Worst case and alternative scenarios including other interested scenarios were evaluated using ALOHA. Each evaluated scenario was assessed further considering countermeasures. The results showed that the facility handling chloric acid is safe enough and needed no further protections at the moment.

A Study on the Safety of Liquefied Hydrogen Refueling Station through Quantitative Risk Assessment (정량적 위험성평가를 통한 액화수소충전소 안전성 고찰)

  • Woo-Il Park;Seung-Kyu Kang;In-Woo Lee;Yun-Young Yang;Chul-Hee Yu
    • Journal of the Korean Institute of Gas
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    • v.27 no.4
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    • pp.116-122
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    • 2023
  • In addition to analyzing the hydrogen economy trends of the international community (Korea, the United States, Europe, Japan, etc.), which is being promoted to realize a carbon-neutral society, this study compared and analyzed the differences between the gaseous hydrogen refueling station, which is a key hydrogen-using facility close to the people, and a liquefied hydrogen refueling station that is scheduled to be built in the future. In addition, SAFETI, a quantitative risk assessment program, was used to analyze the safety of liquefied hydrogen refueling stations and In consideration of the individual and societal risks and the ranking of risks by facility, which are conditional allowable areas, a plan to improve safety such as facility layout was proposed

Causal Relationship between the Risk-inducing Factors and Safety Inspection and Accident Reduction in Small Construction Sites (소규모 건설현장에서 위험유발요인과 안전점검이 재해 저감 대책에 미치는 인과 관계)

  • Moon, Pil-jae;Kong, Ha-Sung
    • The Journal of the Convergence on Culture Technology
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    • v.6 no.2
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    • pp.55-70
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    • 2020
  • This study aims to identify the influence of risk-inducing factors and safety inspection on the measures of reducing accidents among workers of building structures in small construction sites. The result can be summarized as follows: First, as for the influence of risk-inducing factors on human factors, preparation for work, disintegrating molds, taking follow-up measures, and keeping records, have statistically significant influences. Therefore, it can be said that safety inspection has a partial mediating effect in the relationship between risk-inducing factors and human factors. Second, as for the influence of risk-inducing factors on facility factors, preparation for work, and taking follow-up measures influenced significantly. This indicates that safety inspection has a partial mediating effect in the relationship between risk-inducing factors and facility factors. Third, as for the influence of risk-inducing factors on management factors, the installation of shores and risk assessment are found to have significant effects. This shows that safety inspection has a partial mediating effect in the relationship between risk-inducing factors and management factors. Fourth, the influence of risk-inducing factors on work factors was significant only in the installation of shores. This indicates that safety inspection has a completely mediating effect in the relationship between risk-inducing factors and work factors. Finally, in the relationship between risk-inducing factors and accident reduction measures, preparation for work, installation of shores, and taking follow-up measures showed significantly positive influences. In contrast, keeping records has a significant negative influence. Thus, safety inspection has a partial mediating effect in the relationship between risk-inducing factors and management factors.

A Study of Qualitative and Quantitative Risk Assessment for Highway Safety Facilities (고속도로 교통안전시설물의 정성적 및 정량적 위험도분석 연구)

  • Ji, Dong-Han;O, Yeong-Tae;Choi, Hyun-Ho
    • Korean Journal of Construction Engineering and Management
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    • v.8 no.4
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    • pp.99-109
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    • 2007
  • Risk elements of highway safety facilities are affected by complex environments. Thus, risk-based approach for traffic safety facilities is needed. For this, in this study, qualitative and quantitative risk assessment methodology and procedure for highway safety facilities is proposed, which can be used as risk-based approach incorporating VE process. Also, for the quantitative risk assessment, event tree using EPDO(Equivalent Property Damage Only) with respect to frequency and magnitude of risk events is introduced. As a result, risk index of alternative 1(140cm) and 2(127(cm) which can be used as performance factor in VE approach are estimated.

A Study on the Hazard and Risk Analysis of Hospital in Korea - Focused on Local Medical Centers (의료기관의 위험도 분석 조사 - 지역공공의료원을 중심으로)

  • Kim, Youngaee;Song, Sanghoon;Lee, Hyunjin;Kim, Taeyun
    • Journal of The Korea Institute of Healthcare Architecture
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    • v.28 no.4
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    • pp.31-39
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    • 2022
  • The purpose of this study is to analyse the hazard risk by examining the magnitude and severity of each type of hazard in order to mitigate and prepare for disasters in medical facilities. Methods: The hazard risk analysis for hazard types was surveyed for team leaders of medical facilities. The questionnaire analyzed data from 27 facilities, which were returned from 41 Local Medical Centers. Results: When looking at the 'Risk' by category type of hazard, the influence of health safety and fire/energy safety comes first, followed by natural disaster, facility safety, and crime safety. On the other hand, as for 'Magnitude', facility safety and crime safety come first, followed by health safety, fire/energy safety, and natural disasters. Most of the top types of disaster judged to have high hazard in medical facilities are health types. The top five priorities of hazard in medical facilities, they are affected by the geographical and industrial conditions of the treatment area. In the case of cities, the hazard was found to be high in the order of infectious disease, patient surge, and wind and flood damage. On the other hand, in rural areas, livestock diseases and infectious diseases showed the highest hazard. In the case of forest areas, the hazard was high in the order of wildfire, fire accident, lightning, tide, earthquake, and landslide, whereas in coastal areas of industrial complexes, the hazard was high due to fire, landslide, water pollution, marine pollution, and chemical spill accident. Implications: Through the research, standards will be established for the design of hospitals with disaster preparedness, and will contribute to the preparation of preemptive measures in terms of maintenance.