• 대한안전경영과학회지
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• 제8권3호
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• pp.67-75
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• 2006

Scheduling of dismantling old research reactor need to consider time, cost and safety for the worker. The biggest issue when dismantling facility for research reactor is safety for the worker and cost. Large portion of a budget is spending for the labor cost. To save labor cost for the worker, reducing a lead time is inevitable. Several algorithms applied to reduce read time, and safety considered as the most important factor for this project. This research presents three different dismantling scheduling scenarios. Best scenario shows the specific scheduling for worker and machine, so that it could save time and cost.

• 시스템엔지니어링학술지
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• 제14권1호
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• pp.63-71
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• 2018

This paper discusses decommissioning procedure requirements management using requirement engineering to systematically manage the technical requirements and criteria that are required in decontamination and decommissioning activities, and the regulatory requirements that should be complied with in a decommissioning strategy for research reactors and nuclear power plants. A schema was designed to establish the traceability and change management related to the linkage between the regulatory requirements and technical criteria after classifying the procedures into four groups during the full life-cycle of the decommissioning. The results confirmed that the designed schema was successfully traced in accordance with the regulatory requirements and technical criteria required by various fields in terms of decontamination and decommissioning activities. In addition, the changes before and after the revision of the Nuclear Safety Act were also determined. The dismantling procedure requirement management system secured through this study is expected to be a useful tool in the integrated management of radioactive waste, as well as in the dismantling of research reactor and nuclear facilities.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2001년도 춘계학술발표회요약집
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• pp.469.2-469
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• 2001

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2018년도 추계학술논문요약집
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• pp.502-503
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• 2018

• 한국생산제조학회지
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• 제24권3호
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• pp.355-362
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• 2015

Test procedure for the design verification of wind turbine pitch and yaw bearings has been developed. Test items were selected to evaluate operational reliability of pitch and yaw bearings by considering loading and operational conditions, and by analyzing the design criteria of pitch and yaw bearings. The developed test items consisted of preliminary test, fatigue load test, extreme load test, low temperature environmental test and dismantling inspection after all the test were completed. Because it reflects the actual operational conditions of the pitch and yaw bearings, the developed test procedure has high reliability and can verify the basic design considerations in the international standard and guidelines.

• 환경영향평가
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• 제30권4호
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• pp.225-236
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• 2021

4대강 살리기사업(이하 4대강 사업)에 대한 마스터플랜, 사전환경성검토, 환경영향평가, 사후환경 영향조사, 4차례의 감사, 환경부 4대강 조사·평가 기획위원회의 금강과 영산강의 5개 보에 대한 해체 또는 부분 해체 제안 등을 고찰·분석한 결과는 다음과 같다. 첫째 보 운영과 보 개방으로 인한 수질 영향을 비교하여 비용편익분석을 해야 하나 보 개방시 수질 측정자료 부족으로 보 건설전 수질 측정자료로 대체하였기 때문에 수질 영향 분석이 미흡하여 비용편익분석이 제대로 될 수 없었다. 둘째, 금강과 영산강의 보 해체에 대한 비용편익분석 결과에 따라 세종보와 공주보의 해체, 백제보의 수문 상시 개방, 죽산보의 해체, 승촌보의 수문 상시 개방을 결정하였으나, 보 유지시에 대한 비용편익분석을 실시하지 않아 보 해체 결정의 타당성에 문제가 있다. 셋째 4대강 사업 전후 16개 보의 수질 변화를 보면 COD와 Chl-a는 대체로 악화되었고 BOD, SS, T-N, T-P는 개선되었다. 그러나 보 해체시 수질 관련 비용편익분석에서 4대강 사업후 악화된 COD 항목만을 반영하였고 4대강 사업후 개선된 BOD, SS, T-N, T-P 항목에 대한 수질 관련 비용(편익)은 반영하지 않았으므로, 보 해체 편익 산정시 수질 편익이 지나치게 과장되었다고 볼 수 있다. 넷째 공주보와 죽산보의 경우 가동보가 대부분이라 수질 악화시 특히 녹조 심화시 보 개방으로 보 해체와 같은 효과를 기대할 수 있고, 세종보도 가동보가 전체 보 길이의 64%나 되므로 보 개방으로 보 해체 시와 비슷한 효과를 얻을 수 있다. 댐·보·저수지 연계운영을 통해 수질관리가 가능하므로 보 해체만이 수질관리나 수생태계 개선방안이라 단정할 수 없다. 다섯째 가뭄과 홍수에 대응하기 위해 보와 연계되는 도수로 건설로 4대강 상류 가뭄지역에 대한 농업용수 공급 능력을 확보하는 것이 필요하므로, 현재로서는 보의 해체보다는 보의 활용 방안을 모색해야 할 것이다.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 2002년도 춘계 학술발표회 논문집
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• pp.129-134
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• 2002

상업용 원자력 발전소와 연구용 원자로, 재처리시설 또는 원자력 관련 연구시설 등은 일반적으로 한계수명의 도달, 정치 경제적 사유 또는 안전성 둥의 이유로 폐지조치 하게 된다. 현재 세계적으로 80여기 이상의 발전소와 수백 개의 연구시설, 연구로 및 재처리 시설 등이 폐로 중에 있거나 대기중이다.(중략)

• Nuclear Engineering and Technology
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• 제49권4호
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• pp.865-872
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• 2017

For more than 10 years, the laser process has been studied for dismantling work; however, relatively few research works have addressed the effect of high-power fiber laser cutting for thick sections. Since in the nuclear sector, a significant quantity of thick material is required to be cut, this study aims to improve the reliability of laser cutting for such work and indicates guidelines to optimize the cutting procedure, in particular, nozzle combinations (standoff distance and focus position), to minimize waste material. The results obtained show the performance levels that can be reached with 10 kW fiber lasers, using which it is possible to obtain narrower kerfs than those found in published results obtained with other lasers. Nonetheless, fiber lasers appear to show the same effects as those of $CO_2$ and ND:YAG lasers. Thus, the main factor that affects the kerf width is the focal position, which means that minimum laser spot diameters are advised for smaller kerf widths.

• 방사성폐기물학회지
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• 제21권4호
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• pp.481-487
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• 2023

Concerning the apprehensions about naturally occurring radioactive materials (NORM) residues, the International Atomic Energy Agency (IAEA) and its member nations have acknowledged the imperative to ensure the radiation safety of NORM industries. Residues with elevated radioactivity concentrations are predominantly produced during NORM processing, in the form of scale and sludge, referred to as technically enhanced NORM (TENORM). Substantial quantities of TENORM residues have been released externally due to the dismantling of NORM processing factories. These residues become concentrated and fixed in scale inside scrap pipes. To assess the radioactivity of scales in pipes of various shapes, a Monte Carlo simulation was employed to determine dose rates corresponding to the action level in TENORM regulations for different pipe diameters and thicknesses. Onsite gamma spectrometry was conducted on a scrap iron pipe from the titanium dioxide manufacturing factory. The measured dose rate on the pipe enabled the estimation of NORM concentration in the pipe scale onsite. The derived action level in dose rate can be applied in the NORM regulation procedure for on-site judgments.

• 한국안전학회지
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• 제35권4호
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• pp.23-31
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• 2020

In the construction sector, there were 99 fatalities from falls associated with steel tube and system scaffolds for three years from 2016 to 2018 and out of which 27.3 percent (27 workers) were found to have occurred during installing and dismantling procedure. To erect scaffolding which is installed for the work at height, the work platforms are generally installed first and the safety guardrails are installed and vice versa to dismantle. As a result, workers are exposed to the risk of falling because they erect and dismantle scaffolding without guardrails. To minimize the risk of falling, it is necessary to study a new construction method that can erect or dismantle scaffolding while guardrails are installed (called advanced guardrail system). This study analyzed advanced guardrail system in terms of safety regulation, workability and economic efficiency by investigating the domestic situation on the use of scaffolding, reviewing domestic and foreign standards for guardrails and conducting economic feasibility study. The results of this study is expected to greatly contribute to preventing falls in scaffolding installation and dismantlement procedure. As a follow-up study, empirical research is required including physical test of scaffolding with advanced guardrail system and effectiveness analysis after trial applications.