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누출특성을 통한 폭발위험장소 선정방법의 개선에 대한 연구
김대연,천영우,이익모,황용우,Kim, Dae-Yeon,Chon, Young-Woo,Lee, Ik-Mo,Hwang, Yong-Woo 대한안전경영과학회 2017 대한안전경영과학회지 Vol.19 No.2
Classify of explosion hazardous areas must be made at the site where flammable materials are used. This reason is that it is necessary to manage ignition sources in of explosion hazardous areas in order to reduce the risk of explosion. If such an explosion hazard area is widened, it becomes difficult to increase the number of ignition sources to be managed. The method using the virtual volume currently used is much wider than the result using CFD(Computational Fluid Dynamics). Therefore, we tried to improve the current method to compare with the new method using leakage characteristics. The result is a realistic explosion hazard if the light gas is calibrated to the mass and the heavy gas is calibrated to the lower explosion limit. However, it is considered that the safety factors should be taken into account in the calculated correction formula because such a problem should be considered as a buffer for safety.
누적독성부하 산정을 통한 주민소산 전환시점 선정에 관한 연구 -인천지역을 중심으로-
이은지,한만형,천영우,이익모,황용우,Lee, Eun Ji,Han, Man Hyeong,Chon, Young Woo,Lee, Ik Mo,Hwang, Yong Woo 한국안전학회 2020 한국안전학회지 Vol.35 No.6
With the development of the chemical industry, the chemical accident is increasing every year, thereby increasing the risk of accidents caused by chemicals. The Ministry of Environment provides the criteria for determining shelter-in-place or outdoor evacuation by material, duration of accident, and distance from the toxic substance leak. However, it is hard to say that the criteria for determining the transition point are not clear. Transition point mean the time that evacuation method is switched from shelter-in-place to outdoor evacuation. So, the purpose of this study was to calculate appropriate transition point by comparing the cumulative toxic load. Namdong-gu in Incheon Metropolitan City was finally selected as the target area, considering the current status of the population of Incheon Metropolitan City in 2016 and the statistical survey of chemicals in 2016. The target materials were HCl, HF, and NH<sub>3</sub>. Modeling was simulated by ALOHA and performed assuming that the entire amount would be leaked for 10 min. Residents' evacuation scenarios were assumed to be shelter-in-place, immediate outdoor evacuation, and outdoor evacuation at an appropriate time after shelter-in-place. Based on the above method, the appropriate transition point from residents located in A(800 m away), B(1,200 m away), C(1,400 m away) and D(2,200 m away) was identified. In HCl, appropriate transition point was after 15 min, after 16 min, after 17 min, after 20 min in order by A, B, C and D. In HF, appropriate transition point was before 1 min or after 16 min, before 4 min or after 19 min, before 5 min or after 20 min, before 14 min or after 26 min in order by A, B, C and D. In NH<sub>3</sub>, appropriate transition point at A was before 4 min or after 16. Others are not in chemical cloud. This study confirmed the transition point to minimize the cumulative toxic load can be obtained by quantitative method. Through this, it might be possible to select evacuation method quantitatively that cumulative toxic load are minimal. In addition, if the shelter-in-place is maintained without transition to outdoor evacuation, the cumulative toxic load will increase more than outdoor evacuation. Therefore, it was confirmed that actions to reduce the concentration of chemicals in the room were necessary, such as conducting ventilation after the chemical cloud passed through the site.
인화성 액체 옥외저장탱크에서 풀화재 발생 시 장내 피해 저감을 위한 방화벽 설계에 관한 연구
노순미(Sun Mi Ro),천영우(Young Woo Chon),이익모(Ik Mo Lee),황용우(Yong Woo Hwang) 한국위험물학회 2017 한국위험물학회지 Vol.5 No.1
Toluene & methanol are classified as flammable liquids and regulated by the Industrial Safety And Health Act, the Chemicals Control Act, and the Safety Control Of Dangerous Substances Act. They are used widely across the industry. The chances of accidents caused by leak·fire·explosion of those two flammable liquids are growing bigger every day. This study is about designing appropriate height of firewalls for toluene & methanol outdoor storage tank’s pool fire accidents. Considering input variables, such as thermal radiation, orifice diameter and elevation, for PHAST program, we can get the result of effect distances. Moreover, regardless of weather conditions, effect distances of toluene & methanol outdoor storage tank’s pool fire cases influence buildings that are 3 m away. Therefore, we should prepare more measures to prevent property damage and casualties. In case of toluene, the calculated minimum firewall height is 10.97 m at 1.5 m distance and 8.0 m at 3.0 m distance. In case of methanol the calculated minimum firewall height is 6.65 m at 1.5 m distance and 8.0 m at 3.0 m distance. The result of the firewall height is taller than the building it needs to protect, but installing an 8 m high firewall for prevention is unpractical and unrealistic. In this context, it is better to replacing the buildings’ outer wall with fireproof constructions instead of installing a firewall to reflect reality more closely.
HEART기법 활용한 조직의 OH&S경영시스템 및 안전문화와 불안전한 행동 확률에 관한 연구
강동천(Kang, Dong Cheon),천영우(Chon, Young Woo),황용우(Hwang, Yong Woo) 한국서비스경영학회 2020 서비스경영학회지 Vol.21 No.5
The purpose of this study is to predict the probability of unsafe behavior of service workers and to find a reduction plan. In addition, we propose an unsafe behavior probability expression by applying the organizational safety culture level diagnosis factor to the existing HEART technique. For this purpose, this study set up a research model for organizational safety culture by analyzing previous studies and conducted an empirical analysis, and derived formulas in connection with the industrial accident rate of the sample, And the level of safety culture of organization was further derived by the relationship between the cause of unsafe behavior of the organization members and linear multiple. In order to reduce the probability of unsafe behavior of the members, it is necessary to pay attention not only to lower the inherent untrustworthiness by changing to safe work but also to improve the level of organizational safety culture through management system.
액체염소의 Pool vaporization에 따른 위험성 평가에 대한 연구
이주연(Ju Youn Lee),천영우(Young Woo Chon),황용우(Yong Woo Hwang),이익모(Ik Mo Lee) 한국위험물학회 2018 한국위험물학회지 Vol.5 No.2
In this study, quantitative risk assessment of liquid chlorine was conducted. In discharge modeling, the rate that liquid chlorine dropped as droplets after the initial leak was estimated. The maximum downwind distance was calculated by selecting 30 ppm of end point of toxic cloud diffusion. In this study, overall diffusion process is divided into segments for accurate diffusion modeling. Toxic cloud diffusion and surface evaporation were simultaneously analyzed by dividing several segments. The individual risk was presented in the form of contour lines, and the social risk was expressed by the FN curve. All risks were unacceptable, so risk mitigation measures were essential.
의료기관 화재사고의 근본원인분석과 안전성 향상에 관한 연구
김홍관(Hong-Kwan Kim),천영우(Young-Woo Chon),황용우(Yong-Woo Hwang),이익모(Ik-Mo Lee) 한국위험물학회 2019 한국위험물학회지 Vol.7 No.1
This study performed a root cause analysis on large fire accident that took place at Severance Hospital in Shinchon, Seoul, where it held around 1,200 inpatients to provide ways of improving fire safety and decrease the risks. Accident reports, comprehensive analysis countermeasure report, and fire safety regulations were used to collect information and data for the root cause analysis. The fire and safety supervisors were also interviewed. The drill down analysis confirmed lack of safety management on kitchen facilities (brazier), chelation of the ventillation duct due to the oil mist, and the problem with allowing the use of gas brazier inside the breakrooms of the hospital. Safety improvements must be taken into an initiative in not only the areas of accident, but everywhere to decrease the risk of danger.
API 공정의 본질안전설계를 통한 위험성저감 및 비용·편익 분석에 관한 연구
박종필(Jong-Pil Park),천영우(Young-Woo Chon),이익모(Ik-Mo Lee),김홍관(Hong-Kwan Kim),황용우(Yong-Woo Hwang) 한국위험물학회 2021 한국위험물학회지 Vol.9 No.2
This study performed HAZOP, which is a qualitative risk assessment for the API(Active Pharmaceutical Ingredient) process, and aimed to check the solvent change, the root cause, to reduce the derived risk, select accident scenarios and high-risk solvent materials, and identify the substitution of low-risk solvent substances. This study conducted the Consequence Analysis(CA), which is a quantitative risk assessment, to determine the extent of damage in the event of a chemical accident caused by solvents. In addition, the ALOHA of the US Environmental Protection Agency was utilized, and the estimated impact scope was quantified as the cost of disaster loss, in addition to performing a cost-benefit analysis that considers safety and economic feasibility. The difference in the impact scope in the toxic exposure was relatively larger than the difference in the impact in the impact scope in the liquid fire of methanol and ethanol. Due to the characteristics of the pharmaceutical industry, it can be fatal to the human body if methanol remains in pharmaceuticals. Accordingly, it is recommended to use ethanol instead of methanol. This study examined solvent change and suggested a cost-benefit analysis that considers safety and economic feasibility. As a study on the intrinsic safety that replaces high-risk solvents with low-risk solvents, it is expected to contribute to the prevention of serious industrial accident caused by chemicals.