• Journal of the Korean Institute of Gas
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• v.20 no.2
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• pp.66-71
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• 2016

Nowadays, a number of sensors which are placed in industrial complex are monitoring areas involving chemical leak and other faults. However, even in the presence of the sensors, chemical leaks, sometimes involving huge amount of chemicals, continuously led to big losses in the industrial complex. In most industries, sensor installation has been performed using past experience or using senor manufacturers' guideline; which leads to poor performance of the installed sensor grid. Therefore, we investigate an optimal placement methodology of point sensors for rapid detention and response when chemical leaks happen. This research suggests a generalized formulation suitable for the optimized decision making of minimizing number of sensors to be placed and increasing the fraction of covered scenarios under assumption of negligible effect of other structures. The proposed method has been verified for suitable performance for simple leak scenario simulations, by achieving the safety objectives and guaranteeing safe process operations.

• The Safety technology
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• no.198
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• pp.26-28
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• 2014

2년 전인 지난 2012년 9월 27일 경북 구미4공단에 소재한 휴브글로벌에서 불화수소가 누출되는 사고가 발생했다. 이 사고로 근로자 5명이 사망하고 23명이 부상을 당했다. 사고 후 불화수소가 공기를 통해 대량 퍼지면서 인근 지역도 막대한 피해를 입었다. 사고는 안전관리측면에서 많은 허점을 드러냈다. 사업장은 물론 관할 소방서, 구미시 모두에서 화학사고에 대한 대응 매뉴얼과 협조체계가 제대로 구축되지 않아 피해의 확산을 막지 못했다. 너무나 허술한 화학사고 대응체계의 현실에 구미시민은 물론 전 국민이 분노했다. 이에 정부는 화학물질관리 및 사고대응 시스템 전면에 대한 대대적인 개선에 돌입했다. 그리고 그 결과물이 지난해 12월 초 모습을 드러냈다. 관계부처, 지자체, 소방당국, 안전보건공단까지 한데 모여 효과적인 화학사고 예방과 대응을 전담하는 화학재난 합동방재센터가 전국에서 처음으로 구미에 문을 연 것이다. 그로부터 반년이 흐른 지금 구미에는 어떤 변화가 생겼을까. 달라진 화학재난 안전관리체계를 확인해보고자 구미119화학구조센터를 찾아가봤다.

• Nuclear industry
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• v.8 no.7 s.65
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• pp.82-87
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• 1988

프랑스의 Creys-Malville에 있는 1,200MWe급 고속증식로(FBR)의 소유자이며 운전자인 Nersa의 이사장은 이 발전소 시운전중의 경험으로 심각했던 문제는 연료저장드럼에서 발생한 나트륨의 누출사고였다고 하였다.

• Journal of the KSME
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• v.20 no.5
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• pp.333-335
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• 1980

원자력발전소의 열원인 원자로는 막대한 잠재에너지와 핵분열에 의하여 생기는 다량의 방사능을 보유하고 있다. 이 방사능은 무슨 사고라도 생기면 원자로 밖으로 누출되어 총사원이나 인근 주 민들에게 해를 끼칠 우려가 있으며 원자로안전의 기본은 이 방사능을 확실하게 관리하는 것이다.

• Nuclear industry
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• v.7 no.4 s.50
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• pp.66-69
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• 1987

1980년대초에 Wash 1400의 위험성을 분석연구한 프랑스의 안전담당기관과 EdF는 내부압력초과로 격납용기의 파손을 가져올 수 있는 사고가 발생했을 때 대기로 방출될 지도 모를 가스와 Aerosol 누출량을 상당량 줄이기로 목표를 세웠다.

• Proceedings of the Korean Nuclear Society Conference
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• 2002.10a
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• pp.154.2-154
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• 2002

• Korean Journal of Environmental Agriculture
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• v.38 no.1
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• pp.54-60
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• 2019

BACKGROUND: Hydrogen fluoride is one of the 97 accident preparedness substances regulated by the Ministry of Environment (Republic of Korea) and chemical accidents should be managed centrally due to continual occurrence. Especially, hydrogen fluoride has a characteristic of rapid diffusion and very toxic when leaking into the environment. Therefore, it is important to predict the impact range quickly and to evaluate the residual contamination immediately to minimize the human and environmental damages. METHODS AND RESULTS: In order to estimate the accident impact range, the off-site consequence analysis (OCA) was performed to the worst and alternative scenarios. Also, in order to evaluate the residual contamination of hydrogen fluoride in crop, the samples in accident site were collected from 15-divided regions (East direction from accident sites based on the main wind direction), and the concentration was measured by fluoride ($F^-$) ion-selective electrode potentiometer (ISE). As a result of the OCA, the affected distance by the worst scenario was estimated to be >10 km from the accident site and the range by the alternative scenario was estimated to be about 1.9 km. The residual contamination of hydrogen fluoride was highest in the samples near the site of the accident (E-1, 276.82 mg/kg) and tended to decrease as it moved eastward. Meanwhile, the concentrations from SE and NE (4.96~28.98 mg/kg) tended to be lower than the samples near the accident site. As a result, the concentration of hydrogen fluoride was reduced to a low concentration within 2 km from the accident site (<5 mg/kg), and the actual damage range was estimated to be around 2.2 km. Therefore, it is suggested that the results are similar to those of alternative accident scenarios calculated by OCA (about 1.9 km). CONCLUSION: It is difficult to estimate the chemical accident-affecting range/region by the OCA evaluation, because it is not possible to input all physicochemical parameters. However simultaneous measurement of the residual contamination in the environment will be very helpful in determining the diffusion range of actual chemical accident.

• Korean Chemical Engineering Research
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• v.54 no.6
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• pp.781-785
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• 2016

Chloric acid is a toxic chemical and the risk of facility handling chloric acid was assessed from the list of accident scenario to provide countermeasure to keep the vicinity safe. Accident scenarios were listed by using MSDS and 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.

• Journal of the Korean Institute of Gas
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• v.20 no.6
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• pp.1-8
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• 2016

Gu-mi hydrogen fluoride leak accident in 2012 was amplified social anxiety for chemical accidents. To relieve these anxieties Off-site Risk Assessment was introduced in 2015. Off-site Risk Assessment is targeted at most chemicals, and most of the high-pressure-toxic gases which are mainly used in high-tech industries such as semi conductor, display, Photovoltaic panels industry are included in the substance of the Off-site Risk Assessment. Since Korean companies occupy a high market share in high-tech industries, high pressure-toxic domestic gas consumption is constantly increasing. Accordingly, it is expected to increase the possibility of accidents. In accordance with the circumstances, this study was to conducted Consequence Analysis(CA) about high pressure-toxic gases those are high demand in domestic. CA was used for ALOHA developed by US EPA & US NOAA and the CA result of Arsine was the largest at 4,700 m. CA results are expected to be utilized for determining the effective Safety distances when high pressure-toxic gas leak.

• Journal of the Korean Institute of Gas
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• v.20 no.2
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• pp.49-57
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• 2016

Aqueous ammonia is widely used in household cleaners, fertilizers and denitrification process. It is usually treated in concentrations from 10 % to 30 %, and release accidents have occurred frequently. In this study, we developed a simplified estimating method and equation to calculate threat zone easily in case of emergency due to release accident of aqueous ammonia. We calculated the consequence distance for toxic endpoints of aqueous ammonia(concentration 10 % ~ 30 %) at different puddle areas($1m^2{\sim}500m^2$) using the ALOHA program. Based on the result, we analyzed the relationship between concentration and puddle area with the threat zone and created the equation.