• 한국가스학회지
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• 제27권2호
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• pp.32-38
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• 2023

수도권 내 화학공장에서 부식성 유체를 펌프로 저장탱크에 공급하던 도중 수위파악이 정확히 되지 않아 상부 배기벤트로 부식성유체가 누출되는 사고가 발생하였다. 누출 사고가 발생한데는 다양한 원인이 있지만 직접 원인인 레벨게이지의 수위 지시계가 고착되는 것에 초점을 맞추었다. 분석 결과 사고가 발생한 사업장에서 사용되는 수위 지시계를 임의로 교체하였으며, 사고발생인 여름에 Tubular 방식의 레벨게이지는 열팽창이 쉽게 일어나서 다른 형태보다 고착이 발생될 수 있는 것으로 파악되었다. 또한 국내에는 저장탱크에 설치되는 계측기기의 설치기준이 명확치 않아 적정설치 검토에 어려움이 있었다. 따라서 본 연구에서는 사고사례 및 해외기준을 바탕으로 저장탱크 계측기기류 설치 시 유의사항에 대해 검토하였다.

• 핵의학기술
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• 제17권1호
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• pp.3-6
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• 2013

Purpose: The treatment of thyroid cancer patients was continuously increased. According to the increment of thyroid cancer patients, the establishment of iodine therapy site was also increased in each hospital. This treatment involves the administration of radioactive iodine, which will be given in the form of a capsule. Therefore, protections and managements for radioactive source pollution and radiation exposure should be necessary for radiation safety. Among the many problems, the problem of disposing the radioactive wastes was occurred. In this study, The date for self-disposal for radioactive wastes, which were contaminated in clothes, bedclothes and trash, were calculated. Materials and Methods: The number of iodine therapy ward was 15 in Korea Institute of Radiological Medical and Sciences. Recently, 8 therapy wards were operated for iodine therapy patients and others were on standby for emergency treatment ward of any radiation accidents. Radioactive wastes, which were occurred in therapy ward, were clothes, bedclothes, bath cover for patients washing water and food and drink which was leftover by patients. Each sample was hold into the marinelli beaker (clothes, bedclothes, bath covers) and 90 ml beaker (food, drink, and washing water). The activities of collected samples were measured by HpGe MCA device (Multi Channel Analysis, CANBERRA, USA) Results: The storage period for the each kind of radioactive wastes was calculated by equation of storage periods based on the measurement outcomes. The average storage period was 60 days for the case of clothes, and the maximum storage period was 93 days for patient bottoms. The average storage period and the maximum storage period for the trash were 69 days and 97 days, respectively. The leftover foods and drinks had short storage period (the average storage period was 25 days and maximum storage period was 39 days), compared with other wastes. Conclusion: The proper storage period for disposing the radioactive waste (clothes, bedclothes and bath cover) was 100 days by the regulation on self-disposal of radioactive waste. In addition, the storage period for disposing the liquid radioactive waste was 120 days. The current regulation for radioactive waste self-disposing was not suitable for the circumstances of each radioactive therapy facility. Therefore, it was necessary to reduce the leftover food and drinks by adequate table setting for patients, and improve the process and regulation for disposing the short-half life radioactive wastes.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제18권1호
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• pp.25-33
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• 2012

As of November 1st 2010, 59% of overall residences in Korea are apartments with 8,185,000 households and when including the multi-unit houses, 71.0% of the overall residences are multifamily houses. The apartments have become the most universal form of residence in Korea and its' relative weight will continuously increase in the future. Meanwhile, Korea has turned into aging society in 2000 and will turn into the super-aged society by 2026 to display the world's fastest speed for aging. Majority of the elderly will spend their declining years in apartments. To understand the residence consciousness and its' properties for unit housing of the elderly residing in apartments, the present study obtained the following results through surveying the 541 nationwide samples. First, the elderly most prefer the mid and high levels(6-9th floors, or 10-15th floors) of apartments. Second, the elderly couples most prefer areas of $85m^2$ while single elderly most prefer $60m^2$. Third, the elderly feel the most inconveniences in bathrooms and showers. Fourth, safety accidents in dwelling of the elderly have no significant correlation with age, gender or their possessed diseases. Fifth, the elderly displayed high satisfaction for their bedrooms. Sixth, there were less tendencies for elderly to feel lack of storage spaces or conduct remodeling. As a result of the analysis, all apartment houses of Korea must support the physical aging of residents and prevent safety accidents in houses to enable Korean aging in place.

• 가정과삶의질연구
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• 제27권6호
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• pp.141-153
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• 2009

This study is focused on the residential spaces that the elderly wish to renovate and their willingness to improve residential environment as they grow old. The analysis shows, first, the most inconvenient places as they grow old are the stairs, following by the toilet and the bath. Second, the place that the elderly most wish to renovate is the floor, upgrading floors with non-slippery materials. And they wish to remove the height differences on the floor to protect them from tripping over, upgrade the floor plan for their convenience and renovate the storage and working spaces at the kitchen and dining areas. The more the government supports the costs of the residential renovation service, the more the elderly are willing to use the renovation service. The factors influencing their willingness to residential renovation are health, residential environment, experience to accidents and their allowances. The elderly who experienced accidents inside their residence are more willing to renovate their house. Even though the elderly wish to renovate their houses, it's not carried out due to the financial difficulties and the lack of information. Thus, the government should share the useful information about residential renovation for the safety of the elderly and find a way to raise money to cover the costs of the renovation.

• 방사성폐기물학회지
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• 제20권4호
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• pp.411-428
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• 2022

Given the domestic situation, all nuclear power plants are located at the seaside, where interim storage sites are also likely to be located and maritime transportation is considered inevitable. Currently, Korea does not have an independently developed maritime transportation risk assessment code, and no research has been conducted to evaluate the release rate of radioactive waste from a submerged transportation cask in the sea. Therefore, secure technology is necessary to assess the impact of immersion accidents and establish a regulatory framework to assess, mitigate, and prevent maritime transportation accidents causing serious radiological consequences. The flow rate through a gap in a containment boundary should be calculated to determine the accurate release rate of radionuclides. The fluid flow through the micro-scale gap can be evaluated by combining the flow inside and outside the transportation cask. In this study, detailed computational fluid dynamic and simplified models are constructed to evaluate the internal flow in a transportation cask and to capture the flow and heat transfer around the transportation cask in the sea, respectively. In the future, fluid flow through the gap will be evaluated by coupling the models developed in this study.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.295-296
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• 2021

With the recent diversification and complication of buildings, the functions of building are also developing. As much as the development of buildings, the machine or equipment used for them is also developing. Thus, all sorts of domestic/foreign industrial facilities and fire stations in the whole nation are using the electric shutter that could meet the insulation just like the exterior wall of general buildings, for bringing-in/storage and crime prevention/fire prevention. Currently, various types of electric shutters are used. Such wrong operation and poor management are causing many panel-falling accidents. This study researched the reduction of electric shutter panel-falling risk by reviewing the domestic/foreign laws and standards, and researching the new safety equipment. First, the causes for falling and accident types were drawn by analyzing the cases of electric shutter accidents. After that, a checklist as the measures for reducing the falling of electric shutter in building was suggested by analyzing the items for the inspection of electric shutter.

• 한국방재안전학회논문집
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• 제9권2호
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• pp.33-42
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• 2016

항만 옥외저장소는 포장위험물의 수출입을 위해 컨테이너 터미널 특정 공간에 마련된 장소로, 옥외저장소 간 보유공지 기준을 완화하여 사고발생 시 피해확대 우려가 가중되고 있다. 본 연구에서는 탱크 컨테이너로부터 인화성 액체 누출로 인한 액면화재를 모사함으로써 복사열에 대한 피해영향을 분석하였다. 그 결과 임계손상기준에 따른 복사열 도달거리가 현행 보유공지 기준을 상회하는 것으로 분석되었으며, 인접 컨테이너가 early pool fire에 지속적으로 노출될 경우 단시간 내 구조적 손상 가능성이 있는 것으로 평가되었다. 본 연구는 컨테이너 터미널에서의 적절한 옥외저장소 간 보유공지 기준을 마련하는데 도움이 될 수 있을 것으로 판단된다.

• 한국가스학회지
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• 제9권1호
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• pp.44-50
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• 2005

본 논문에서는 LNG저장탱크의 통압제어 안전관리 시스템에 대한 연구결과를 제시하고 있다. 통합제어 및 안전관리를 효과적으로 진행하기 위한 새로운 통합관리 시스템은 내부탱크로부터 유출되는 가스나 초저온 액체(LNG)에 의한 안전성과 누출문제를 제어하기 위해 온도, 압력, 진동과 같은 신호를 검지하고, 종합적으로 분석하여 시스템의 안전성을 확보할 수 있도록 개발된 것이다. 효율성과 안전성 향상측면에서 LNG저장탱크의 저장용량 증가경향과 최근에 발생된 저장탱크의 고장사례 고찰을 통하여, 기존의 측정장치와 안전장치는 개량되고, 새로운 기술개발이 필요하다는 것을 강조한다. 따라서 본 연구에서는 초대형 LNG저장탱크의 제어와 안전관리를 위해 새로이 개발된 통합제어 안전관리 시스템을 제시하고 있다. 이 시스템에서는 기존의 측정 및 안전장치에 대한 통합과 연계성 및 성능을 향상시키고, 특히 저장탱크 구조물의 변위량을 측정하여 안전성을 확보할 수 있도록 기능성을 새로이 추가하였다. 본 연구에서 개발된 통합제어 안전관리 시스템에 프로세스 통합관리 시스템(PIIS)을 연계하여 사용한다면, LNG 저장탱크의 안전성, 효율성, 생산성은 획기적으로 향상될 것이다.

• Nuclear Engineering and Technology
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• 제49권2호
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• pp.411-425
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• 2017

Using a probabilistic safety assessment, a risk evaluation framework for an aircraft crash into an interim spent fuel storage facility is presented. Damage evaluation of a detailed generic cask model in a simplified building structure under an aircraft impact is discussed through a numerical structural analysis and an analytical fragility assessment. Sequences of the impact scenario are shown in a developed event tree, with uncertainties considered in the impact analysis and failure probabilities calculated. To evaluate the influence of parameters relevant to design safety, risks are estimated for three specification levels of cask and storage facility structures. The proposed assessment procedure includes the determination of the loading parameters, reference impact scenario, structural response analyses of facility walls, cask containment, and fuel assemblies, and a radiological consequence analysis with dose-risk estimation. The risk results for the proposed scenario in this study are expected to be small relative to those of design basis accidents for best-estimated conservative values. The importance of this framework is seen in its flexibility to evaluate the capability of the facility to withstand an aircraft impact and in its ability to anticipate potential realistic risks; the framework also provides insight into epistemic uncertainty in the available data and into the sensitivity of the design parameters for future research.

• 한국화재소방학회논문지
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• 제33권2호
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• pp.107-113
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• 2019

최근 지구 온난화 현상에 따라 낙뢰가 증가하고 있는 추세이며 산업시설과 인프라 설비에 사고 위험이 가중되고 있다. 특히 낙뢰가 정유 및 석유화학 공장의 시설물이나 저장탱크 등 인프라 설비에 떨어지는 경우 가동 중인 공장에 정전, 전자기기의 오동작이나 파손을 유발하거나 화재 폭발과 함께 동시 다발적이고 복합적인 재해를 초래하게 된다. 그러므로 낙뢰사고에 대한 체계적인 연구를 통하여 낙뢰에 대한 메커니즘의 이해 및 낙뢰에 의한 화재 폭발 발생 사례를 심층 분석하고, 조사 방법을 체계화하여 예방대책을 강구 할 필요가 있다. 본 연구는 낙뢰에 의해 석유화학공장의 폐수저장탱크 내부의 유증기가 폭발한 사례에 대해 사고 원인을 분석하고 그 원인에 따른 사전 예방대책을 제시하여 낙뢰에 의한 사고 발생을 예방하고자 한다.