• Proceedings of the Korean Institute of Industrial Safety Conference
• /
• 1998.05a
• /
• pp.285-291
• /
• 1998

산업안전보건법 제48조에 의거 사업장의 유해위험시설을 보유하기 위해 신설, 증설, 변경 또는 이전시에 유해위험물질의 누출, 화재, 폭발 등으로 인하여 사업장내 근로자나 인근 주민들에게 피해를 줄 수 있는 사고를 사전에 예방하기 위하여 유해위험방지계획서나 공정안전보고서를 작성하여 노동부장관에게 제출토록 의무화가 되어있다. 각 사업장은 이러한 사전예방에 활용하기 위한 위험성 평가방법을 어떤 기법으로 어떻게 도입하여 적용시키고 있으며, 또 할 예정인가 사내에는 어떤 제도화가 되어 있는가 대책은 어떻게 반영되고 실시에 어떤 문제점이 있는가 등의 사실을 업종별로 파악하여 제조업종의 위험성 평가도입에 따른 문제점과 대책을 제시할 필요가 있다. (중략)

• 기계와재료
• /
• v.24 no.1
• /
• pp.72-79
• /
• 2012

최근 미국 멕시코만에서의 대형 오일 누출 사고에서 보듯이 에너지플랜트에서의 사고는 막대한 인명피해, 경제적 피해를 유발한다. 최근 플랜트 설계의 주요 관심사는 플랜트의 생애주기에서 사고에 의한 위험도(RISK)를 적정 수준 아래로 제어하는 것이다. 이를 위해 플랜트 설계 단계에서 필요한 정량적 위험도 분석(Qualitative Risk Assessment) 방법론을 개괄하였다. 아울러 QRA의 핵심이 되는 플랜트 기기 고장률 DB 구축의 필요성을 논하였다.

• Journal of Chest Surgery
• /
• v.34 no.10
• /
• pp.800-804
• /
• 2001

The intractable pneumothorax with continuous air leakage, emphysematous lung and high operative risk treated by selective bronchial occlusion has been seldomly reported abroad. The bronchus responsible for air leakage was occluded with such materials as fibrin glue, gelatin sponge and oxidized regenerated cellulose(surgicel). We performed selective bronchial occlusion by flexible fiberoptic bronchoscopy with gelfoam in two cases. There was no complication after the procedure; therefore, we report the treatment for intractable pneumo- thorax by bronchoscopy with gelfoam packing.

• Journal of the Korean Institute of Gas
• /
• v.18 no.3
• /
• pp.67-74
• /
• 2014

Buried natural gas pipelines in densely populated urban areas have serious hazards of property damages and casualties generated by release, dispersion, fire and explosion of gas caused by outside or inside failures. So as to prevent any accident in advance, managers implement danger management based on quantitative risk analysis. In order to evaluate quantitative risk about buried natural gas pipelines, we need calculation for radiant heat and pressure wave caused by calculation for release rate of chemical material, dispersion analysis, fire or explosion modeling through consequence analysis in priority, in this paper, we carry out calculation for release rate of pressured natural gas, radiant heat of fireball based in accident scenario of actual "San Bruno" buried high pressured pipelines through models which CCPS, TNO provide and compare with an actual damage result.

• Fire Science and Engineering
• /
• v.32 no.3
• /
• pp.76-87
• /
• 2018

This study describes the damage effects modeling for a quantitative prediction about the hazardous distances from pressurized chlorine saturated liquid tank, which has two-phase leakage. The heavy gas, chlorine is an accidental substance that is used as a raw material and intermediate in chemical plants. Based on the evaluation method for damage prediction and accident effects assessment models, the operating conditions were set as the standard conditions to reveal the optimal variables on an accident due to the leakage of a liquid chlorine storage vessel. A model of the atmospheric diffusion model, ALOHA (V5.4.4) developed by USEPA and NOAA, which is used for a risk assessment of Off-site Risk Assessment (ORA), was used. The Yeosu National Industrial Complex is designated as a model site, which manufactures and handles large quantities of chemical substances. Weather-related variables and process variables for each scenario need to be modelled to derive the characteristics of leakage accidents. The estimated levels of concern (LOC) were calculated based on the Gaussian diffusion model. As a result of ALOHA modeling, the hazardous distance due to chlorine diffusion increased with increasing air temperature and the wind speed decreased and the atmospheric stability was stabilized.

• Journal of the Korean Institute of Gas
• /
• v.27 no.1
• /
• pp.63-69
• /
• 2023

Although Korea is the world's No. 1 semiconductor producing country, most studies are conducted with risk assessment for simple material risks due to the closedness of the site for industrial protection. In terms of industrial safety, a monitoring system such as a gas detector to determine the leakage of hazardous substances has been established, but research on effectively discharging harmful gastritis substances in case of leakage has only recently begun. Semiconductor manufacturing facilities (gas boxes) where a large amount of flammable materials are handled are currently being safety managed by using a gas detector and blocking the air inlet. It is difficult to dilute in a short time in case of leakage of flammable substances. Therefore, in this study, based on various criteria, the size of the duct according to the size of the gas box is determined and the appropriate size of the air inlet is studied to minimize the exhaust performance requirement without exposing hazardous chemicals to the outside in the event of a flammable leak. We want to do an optimal exhaust design.

• Journal of the Korean Institute of Gas
• /
• v.16 no.1
• /
• pp.15-21
• /
• 2012

An analysis was completed of the hazards distance of hydrogen accidents such as jet release, jet fire, and vapor cloud explosion(VCE) of hydrogen gas, and simplified equations have been proposed to predict the hazard distances to set up safety distance by the gas dispersion, fire, and explosion following hydrogen gas release. For a small release rate of hydrogen gas, such as from a pine-hole, the hazard distance from jet dispersion is longer than that from jet fire. The hazard distance is directly proportional to the pressure raised to a half power and to the diameter of hole and up to several tens meters. For a large release rate, such as from full bore rupture of a pipeline or a large hole of storage vessel, the hazard distance from a large jet fire is longer than that from unconfined vapor cloud explosion. The hazard distance from the fire may be up to several hundred meters. Hydrogen filling station in urban area is difficult to compliance with the safety distance criterion, if the accident scenario of large hydrogen gas release is basis for setting up the safety distance, which is minimum separation distance between the station and building. Therefore, the accident of large hydrogen gas release must be prevented by using safety devices and the safety distance may be set based on the small release rate of hydrogen gas. But if there are any possibility of large release, populated building, such as school, hospital etc, should be separated several hundred meters.

• Journal of the Korean Institute of Gas
• /
• v.21 no.5
• /
• pp.95-103
• /
• 2017

A lot of hazardous materials have been used for product processing and utility plant. Many accidents including toxic release, fire and explosions occur in the ammonia related facility and plant. Various safety and environment management program including PSM, SMS, ORA etc. are being implemented for risk management and accident prevention in the production industry. Also much study and research have been carried about risk assessment of accident scenario in the academic and research area. In this paper, firstly risk level was assessed by using a typically used KORA program and LOPA PFD method for the selected ammonia unloading and storage facility. And then risk reduction measures for the risk assessed facility were studied in 3 aspects and some measures were proposed. Those Risk Reduction measures are including a leak detection and emergency isolation, water spray, dilution tank, dike and trench, scattering protection in hardware impovement aspect, and a applicable risk criteria, conditional modifier for existing LOPA PFD, alternative supporting modeling program in risk estimation methodology aspect, and last RBPS(Risk Based Process Safety) program, re-doing of process hazard analysis, management system compliance audit in managerial activity aspect.

• Journal of the Korean Institute of Gas
• /
• v.16 no.6
• /
• pp.48-54
• /
• 2012

Building above-ground membrane LNG storage tanks have been recently actively reviewed because they have advantages in ease of large capacity, environmental friendliness, and low possibility of gas leakage of the inner tank (slow increase of leakage speed). In this paper, the safety of membrane LNG storage tanks was ensured through comparative risk assessment of full-containment LNG storage tanks and membrane LNG storage tanks by using Fault Tree Analysis (FTA). Risk assessment results showed that both types of tanks have very similar level of risk except for the membrane storage tanks without additional safety equipments (early model).

• 한국가스학회:학술대회논문집
• /
• 2006.11a
• /
• pp.169-176
• /
• 2006