• Title/Summary/Keyword: Leakage risk

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A Study on the Quantitative Risk Assessment of Hydrogen-CNG Complex Refueling Station (수소-CNG 복합충전소 정량적 위험성평가에 관한 연구)

  • Kang, Seung-Kyu;Huh, Yun-Sil
    • Journal of the Korean Institute of Gas
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    • v.24 no.1
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    • pp.41-48
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    • 2020
  • This study performed a quantitative risk assessment for hydrogen-CNG complex refueling stations. Individual and societal risks were calculated by deriving accident scenarios that could occur at hydrogen and CNG refueling stations and by considering the frequency of accidents occurring for each scenario. As a result of the risk assessment, societal risk levels were within the acceptable range. However, individual risk has occurred outside the allowable range in some areas. To identify and manage risk components, high risk components were discovered through risk contribution analysis. High risks at the hydrogen-CNG complex refueling station were large leakage from CNG storage containers, compressors, and control panels. The sum of these risks contributed to approximately 88% of the overall risk of the fueling station. Therefore, periodic and intensive safety management should be performed for these high-risk elements.

Analysis of the Electric Potential distribution and Evaluation of Electric Shock Risk in Bathtub (욕조에서의 전위분포 해석 및 전격재해 위험성 평가)

  • Kim, Chong-Min;Kim, Han-Sang;Jung, Jong-Wook;Jung, Jin-Soo;Kim, Sung-Chul
    • Proceedings of the KIEE Conference
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    • 2006.05a
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    • pp.37-40
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    • 2006
  • This paper presents the evaluation electric shock risk In bath so that we made and designed a bathtub which is the same size in real public bath. and then we did an experiment, provided of electric leakage in various conditions so, we measured how to form an electric potential and knew the electric potential is formed variously under exposed conductor in bath. also we made certain that electric shock risk is down if we insert an insulated pipe in bathtub pipe which is prevent from being formed the electric field sharply.

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Fire and Explosion Analysis for Quantitative Risk Assessment on LNG Test Plant (LNG 시험 플랜트의 정량적 위해도 평가를 위한 화재 및 폭발사고 해석)

  • Han, Yong Shik;Kim, Myungbae;Do, Kyu Hyung;Kim, Tae Hoon;Choi, Byungil
    • Journal of the Korean Society of Combustion
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    • v.20 no.1
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    • pp.1-5
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    • 2015
  • Fire and explosion analysis are performed for the quantitative risk assessment on the LNG test plant. From the analysis for a case of fire due to large leakage of LNG from the tank, it is obtained that loss of lives can be occurred within the radius of 60 m from the fire origin. Specially, wind can extend the extent of damage. Because the LNG test plant is not enclosed, the explosion overpressure is less than 6 kPa and the explosion has little effect on the integrity of the LNG test plant.

Study of the Electric Shock Risk in Water at the Waterpark, Public Bath (물놀이.입욕시설에서의 수중 감전 위험성 연구)

  • Kim, Chong-Min;Kim, Han-Sang;Kim, Gi-Hyun
    • Proceedings of the KIEE Conference
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    • 2006.07e
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    • pp.93-94
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    • 2006
  • This paper presents the evaluation electric shock risk in water so that we made and designed a bathtub which is the same size in real public bath. and then we did an experiment, provided of electric leakage in various conditions so, we measured how to form an electric gradient and knew the electric gradient is formed variously under exposed conductor in water. also we made certain that electric shock risk is down if we insert an insulated pipe in bathtub pipe which is prevent from being formed the electric field sharply.

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Helium guard system design for HIAF iLinac cryogenic distribution system

  • Xianjin Wang;Shuping Chen;Wen Jun;Dajun Fan;Liming Zhu;Yanan Lib;Xiaofei Niu;Junhui Zhang
    • Progress in Superconductivity and Cryogenics
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    • v.25 no.1
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    • pp.6-10
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    • 2023
  • 2 K superfluid helium cryogenic system is the crucial component of many large accelerators. When the cryogenic system is operating at 2K@3129Pa, many room-temperature parts are connected to superfluid helium via tubes. Air Leakage in these connections may lead to air contamination of the cryogenic system. Air contamination may cause equipment failure in cryogenic systems and, in extreme cases, render the entire accelerator system inoperable. Helium guard is a technique that guards against air contamination of these sub-atmospheric pressure connections in 2 K superfluid helium cryogenic system. This paper introduces a typical 2 K cryogenic distribution design for large accelerators, and make risk analysis of air contamination. Finally, the analysis of specific leakage points and detailed engineering design are presented, which may be used as a reference when designing of a 2 K superfluid helium cryogenic distribution system.

A Study on the Work Management Method Considering Risks in Nuclear Power Plants (원자력발전소에서 리스크를 고려한 작업관리 방법)

  • Song, Tae-Young
    • Transactions of the Korean Society of Pressure Vessels and Piping
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    • v.10 no.1
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    • pp.37-43
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    • 2014
  • Nuclear power plants(NPPs) are consisted of power production functions and safety functions preventing leakage of radiation. Operators working in NPPs shall maintain these functions during an operation period through various activities such as improvement & modification, corrective maintenance, preventive maintenance and surveillance test. According to the performance of these work activities, there are configuration changes in NPPs systems. Its changes cause the increase of safety risks(CDF) and plant trip risks. Recently, the importance of risk management is increasing gradually in the operation process of NPPs. Therefore, this paper presents the work management methods using the various risk monitoring systems during power operation and overhaul period. Also this paper suggests the optimum application ways of risk systems for work management.

Risk Assessment for Abolition of Gross Containment Leak Monitoring System Test in CANDU Design Plant (중수로 원자로건물 총누설감시계통 시험 중지에 따른 리스크 영향 평가)

  • Bae, Yeon-Kyoung;Na, Jang-Hwan;Bahng, Ki-In
    • Journal of the Korean Society of Safety
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    • v.30 no.5
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    • pp.123-130
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    • 2015
  • Wolsong Unit 2,3&4 has been performing a containment integrity test during power operation. This test could impact to the safe operation during test. If an accident occurs during pressure dropping phase, reactor trip can be delayed because of the increased pressure difference which causes a time delay to reach the trip set-point. On the contrary, if an accident occurs during pressure increasing phase, reactor trip could be accelerated because the pressure difference to the trip set-point decrease. Point Lepreau nuclear power plant, which installed GCLMS (Gross Containment Leakage Monitoring System) in 1990, has discontinued the test since 1992 due to these adverse effects. Therefore, we evaluated the risk to obviate the GCLMS test based on PWR's ILRT (Integrated Leak Rate Test) extension methodologies. The results demonstrate that risk increase rate is not high in case of performing only ILRT test at every 5 years instead of doing GCLMS test at every 1.5 years. In addition, the result shows that GCLMS test can be removed on a risk-informed perspective since risk increasement is in acceptable area of regulatory acceptance criteria.

Privacy Disclosure and Preservation in Learning with Multi-Relational Databases

  • Guo, Hongyu;Viktor, Herna L.;Paquet, Eric
    • Journal of Computing Science and Engineering
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    • v.5 no.3
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    • pp.183-196
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    • 2011
  • There has recently been a surge of interest in relational database mining that aims to discover useful patterns across multiple interlinked database relations. It is crucial for a learning algorithm to explore the multiple inter-connected relations so that important attributes are not excluded when mining such relational repositories. However, from a data privacy perspective, it becomes difficult to identify all possible relationships between attributes from the different relations, considering a complex database schema. That is, seemingly harmless attributes may be linked to confidential information, leading to data leaks when building a model. Thus, we are at risk of disclosing unwanted knowledge when publishing the results of a data mining exercise. For instance, consider a financial database classification task to determine whether a loan is considered high risk. Suppose that we are aware that the database contains another confidential attribute, such as income level, that should not be divulged. One may thus choose to eliminate, or distort, the income level from the database to prevent potential privacy leakage. However, even after distortion, a learning model against the modified database may accurately determine the income level values. It follows that the database is still unsafe and may be compromised. This paper demonstrates this potential for privacy leakage in multi-relational classification and illustrates how such potential leaks may be detected. We propose a method to generate a ranked list of subschemas that maintains the predictive performance on the class attribute, while limiting the disclosure risk, and predictive accuracy, of confidential attributes. We illustrate and demonstrate the effectiveness of our method against a financial database and an insurance database.

A study on the Risks of Using Filtration Facilities at the Organic Light Emitting Diode(OLED) and Its Preventive Measures (유기발광다이오드(OLED) 소재 제조 현장 여과 설비사용 위험성 및 개선 방안 연구)

  • Jong-Ku Kwak;Chankyu Kang
    • Journal of the Korean Institute of Gas
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    • v.27 no.4
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    • pp.1-11
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    • 2023
  • The size of the OLED material market is expected to grow from $1.1 billion in 2019 to $2.3 billion in 2023, with an average annual sustainable growth of more than 19%. Among the facilities mainly used by OLED material manufacturers, accidents such as fire, explosion, and leakage frequently occur when using filtration equipment, so it is necessary to improve the risk when using filtration equipment. In this study, it was divided into four main processes, namely, assembly and disassembly process, filtration process, wet cake recovery process, and washing process in order to derive the risks associated with the use of filtration equipment. Hazard factors were derived by conducting accident case investigations, preliminary interviews, and surveys. For the analysis of questionnaire results, statistical analysis such as frequency analysis and Pearson chi-square test analysis was performed using SPSS 21, and risk improvement measures were suggested using the analyzed results. It is expected that this study will serve as a basis for dealing with safety and risk factors that may occur as the size of the OLED market expands.

Perception differences between users and policy-makers on technology protection support system for small and medium-sized businesses (중소기업 기술보호지원제도에 대한 이용자와 정책담당자의 인식차이 분석)

  • Park, Sanghoon;Cho, Namwook
    • Journal of Korea Society of Digital Industry and Information Management
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    • v.13 no.1
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    • pp.37-48
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    • 2017
  • As the risk of technical leakage is increasing, technology protection support systems for small and medium-sized businesses have gained attention. This paper analyzed the perception gap of the user and policy-maker regarding technology protection support systems. First, to identify key elements of technology protection support systems and construct measurement factors, interviews with experts are conducted. Then, surveys are conducted to analyze the perception differences between the users and policy-makers. Factor analysis and ANOVA have been utilized to analyze survey results. The result shows that the perception gaps exist in the following areas: management system, cost reduction, copyright protection, customer satisfaction, leakage prevention, and awareness. To enhance the effectiveness of technology protection support systems, this paper suggests technology protection support systems should be customized in terms of the company's size and type of busines.