• 한국항해항만학회지
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• 제29권2호
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• pp.151-157
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• 2005

During the period of every summer to early autumn seasons, ships have been wrecked or grounded from effect of a typhoon in the water areas around Korean Peninsula Typhoon Rusa killed more than 100 people in September 2002. Super Typhoon Maemi passed southeast of South Korea in September 12-13, 2003, with a strong gale blowing at a record 60 m/s and caused much ship groundings, collisions and sinkings over 3000 in dockyards, harbors and places of refuge. These are things that could have been prevented had there merely been prior warning. This study outlines the occurrence characteristics of maritime accidents caused by a typhoon in South Korea for the period from 1962 to 2002. The distribution of the accident records is also compared with the trajectories, winds, central pressures of typhoons, passed during the 1990-2003. It is shown that attack frequency of typhoon and number of marine accidents is the highest in August and the marine accidents due to typhoon have a close relation to the distribution of accumulated wind and pressure fields.

• Nuclear Engineering and Technology
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• 제38권2호
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• pp.185-194
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• 2006

Transient operations for an integral type reactor, SMART-P, have been experimentally investigated using a thermal-hydraulic integral test facility, VISTA (Experimental Verification by Integral Simulation of Transients and Accidents), in order to verify the system design and performance of the SMART-P, a pilot plant of SMART. The VISTA facility was subjected to various accident conditions such as feedwater increase and decrease, loss of coolant flow, and control rod withdrawal accidents in order to elucidate the thermal-hydraulic responses following such accidents and finally to verify the system design of the SMARTP. Full functional control logics have been implemented in the VISTA facility in order to control the required control action for an accident simulation. As one of the sensitivity tests to verify the PRHRS performance, the effects of the initial water level in the compensation tank are experimentally investigated. When the initial water level is 16%, the water is quickly drained and nitrogen gas is then introduced into the PRHR system, resulting in deterioration of the PRHRS performance. It is thus found that nitrogen ingression should be prevented to ensure stable PRHRS operation.

• Nuclear Engineering and Technology
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• 제45권4호
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• pp.459-468
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• 2013

During a station blackout (SBO), the initiating event is a loss of Class IV and Class III power, causing the loss of the pumps, used in systems such as the primary heat transporting system (PHTS), moderator cooling, shield cooling, steam generator feed water, and re-circulating cooling water. The reference case of the SBO case does not credit any of these active heat sinks, but only relies on the passive heat sinks, particularly the initial water inventories of the PHTS, moderator, steam generator secondary side, end shields, and reactor vault. The reference analysis is followed by a series of sensitivity cases assuming certain system availabilities, in order to assess their mitigating effects. This paper also establishes the strategies to mitigate SBO accidents. Current studies and strategies use the computer code of the Integrated Severe Accident Analysis Code (ISAAC) for Wolsong plants. The analysis results demonstrate that appropriate strategies to mitigate SBO accidents are established and, in addition, the symptoms of the SBO processes are understood.

• 한국항해항만학회지
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• 제47권6호
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• pp.350-357
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• 2023

해상특보가 발효되었을 때 평수구역 내에서 선박출항통제 대상에서 제외되는 선박의 무리한 운항으로 인한 사고가 빈번하게 발생하고 있다. 평수구역 내에 설치된 파고부이는 선박출항통제의 주요 참고 지표이며 평수구역 및 연안을 항행하는 선박의 안전과 직결된다고 볼 수 있다. 이 연구에서는 최근 30년간(1991~2020년)의 연안 해양사고, 각 무역항의 주풍향 및 풍속, 2018년 GICOMS 선박 항적 데이터 분석을 통하여 현재 운영 중인 파고부이의 위치 적절성 및 평수구역 내 파고부이 추가설치에 대한 평가를 수행하였다. 연구 결과 국내 주요 무역항인 인천항, 포항항, 울산항 및 부산항에 각 1개의 파고부이 추가설치가 필요하며, 부산항의 경우 파고부이 1개의 위치 이동이 필요한 것으로 검토되었다. 이 연구에서 여러 가지 데이터 분석을 바탕으로 제시된 파고부이의 추가설치 및 이동에 대한 제언은 선박출항통제의 신뢰도 향상 및 안전사각지대 해소에 기여할 것으로 판단된다.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1997년도 추계학술발표회논문집(1)
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• pp.469-474
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• 1997

To provide tile information ell severe accident progression is very important for advanced or new type of nuclear power plant (NPP) design. A parametric study, therefore was performed to investigate the effect of thermal hydraulic design parameters ell severe accident progression of pressurized water reactors (PWRs), Nine parameters, which are considered important in NPP design or severe accident progression, were selected among the various thermal hydraulic design parameters. The backpropagation neural network (BPN) was used to determine parameters, which might more strongly affect the severe accident progression, among mile parameters. For training. different input patterns were generated by the latin hypercube sampling (LHS) technique and then different target patterns that contain core uncovery time and vessel failure time were obtained for Young Gwang Nuclear (YGN) Units 3&4 using modular accident analysis program (MAAP) 3.0B code. Three different severe accident scenarios, such as two loss of coolant accidents (LOCAs) and station blackout(SBO), were considered in this analysis. Results indicated that design parameters related to refueling water storage tank (RWST), accumulator and steam generator (S/G) have more dominant effects on the progression of severe accidents investigated, compared to tile other six parameters.

• 한국지하수토양환경학회지:지하수토양환경
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• 제23권6호
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• pp.1-8
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• 2018

In this study, formaldehyde and benzene were selected as the arbitrary chemicals in accidental leakage to environment, and their physicochemical and biological characteristics and toxicity were studied. Also, the fate of these chemicals in soil and groundwater was studied based on the results of previous studies. They can be released into the atmosphere as gas or vapor phase, which then can be photochemically degraded. Since they have relatively high water solubility, they are likely to have high mobility in water and soil. Volatilization of these chemicals from soil is affected by the soil moisture content. Biodegradation of formaldehyde and benzene is one of the important pathways as well. Therefore, it is necessary to study the environmental impacts of leakage accidents of flammable chemicals such as formaldehyde and benzene. Further research on the fate of flammable chemicals in the environment is needed to take appropriate response actions to leakage accidents of flammable chemicals, and this will contribute to the development of practical guidelines to cope with leakage accidents.

• 해양환경안전학회지
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• 제29권4호
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• pp.332-337
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• 2023

우리나라는 3면이 바다로 둘러싸여 있을 뿐만 아니라 국가하천과 지방하천의 연장이 26,843km에 달하고 있어 풍부한 해수면과 내수면이 함께 공존하는 지리적 특징이 있다. 국민소득의 향상 등으로 내수면에서 운항하는 선박이 지속적으로 증가하고 있어 내수면에서 선박사고 및 인명사고의 위험성도 증가하고 있다. 본 연구에서는 내수면관련 법령조사 및 운영현황 분석을 통하여 거시적인 내수면 선박의 안전관리 대책 방안을 제시하였다. 그 개선방안으로 하드웨어적 인프라로서 사고 초기대응 및 인명구조의 골든타임 확보를 위한 충분한 내수면 소방정의 확보와 내수면 선박 사고예방 전문기관의 운영을 제언하며, 소프트웨어적 인프라로서 내수면 선박의 출항통제기준 마련과 현행 해수면 선박에만 적용하고 있는 안전진단제도를 기반으로 내수면 선박의 특성에 맞는 맞춤형 제도도입을 제언하였다. 이러한 내수면 안전관리 정책은 내수면 선박 사고발생 시 신속하고 체계적인 대처 방안 마련에 기여할 것으로 기대되며, 세월호 사건 이후 잠시 활성화 되었던 내수면 선박에 대한 안전관련 연구에 지속적인 관심을 갖는 기회가 되었으면 한다.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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• pp.309-310
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• 2014

Commercial gas burning appliances are classified by KGS AB338. Even though there are many types of gas appliances with different purposes and uses, common standards are applied to the appliances. Manifold of commercial gas range could often be corroded by salt water. Gas leaks and accidents could be occurred by the corrosion. According to suggestion of detailed material standards for manifold of commercial gas range, it could help to use safely and prevent gas accidents.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2003년도 학술대회논문집
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• pp.117-122
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• 2003

Street light facilities, which are easily accessible, can be in danger of electric shock when water percolates the facilities especially in summer. In case deteriorated facilities are not checked regularly, they can cause accidents such as electric shock. We should consider regional characteristics to prevent this kind of accidents. In this paper, we analyzed the problems according to the facilities through the research on the actual conditions. We also analyzed the facilities by region and the standards by the conditions.

• 환경정책연구
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• 제2권1호
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• pp.1-29
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• 2003

This paper examines the dynamics of environmental policy development in Korea by reviewing some of the ways on how the policy windows have been opened. There are a lot of theoretical arguments about the major factors influencing policy development or changes. Many scholars have believed that severe pollution accidents or salient environmental episodes might have been the main motivation of environmental policy development. This line of argument seems valid, especially with the water pollution control policy in Korea. Water pollution control programs had rapidly expanded along with the series of water pollution accidents in the tap water sources from the late 1980s to mid-1990s. However, regarding other major env. issues, various other factors have played more important roles in the development of the relevant policies. In case of air pollution control policy international sport events such as, 1986 Asian Games, 1988 Summer Olympics, and 2002 World Cup Competition, have contributed for the development. The municipal solid waste management policy partly owed its development to the introduction of local autonomy system in the mid-1990s. Even the foreign currency crisis occurring in December 1997 helped the policy paradigm shift from rigid supply-oriented to soft demand-oriented approaches. After closely looking at the dynamics of environmental policy development in Korea, this paper tries to identify the logical background of the observed outcomes.