• 한국진공학회지
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• 제15권6호
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• pp.547-555
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• 2006

포항가속기연구소가 1994년에 완공한 제3세대 방사광가속기는 방사광을 만들어내어 실험에 이용하는 시설로써 전자를 2.5 GeV까지 가속시키는 선형가속기와 이 전자를 저장하여 회전시키면서 방사광을 발생시키는 원주 280 m의 저장링으로 되어 있다. 현재 저장링에 27개의 빔라인 시설이 설치되어 실험을 수행 중에 있다. 또한 포항가속기연구소는 차세대 방사광 발생장치인 제4세대 방사광가속기 건설 계획을 추진 중에 있다. 이 논문에서는 현재 가동 중인 방사광가속기의 현황과 4세대 가속기의 건설 추진 현황에 대해 설명하고자 한다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 추계학술대회논문집
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• pp.550-553
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• 2004

Recently, the demand for the Floating, Production, Storage, and Offloading facility (FPSO) which has some economic and technical advantages, has increased in offshore oil production areas. The 36,8000 DWT class FPSO was built in Hyundai Heavy Industries and will be installed in Offshore Angola. She dose not have self-propulsion system, but has additional facilities for oil production and positioning system. Main noise sources are contributing to the cabin noise of the accommodation are classified into three classes such as the machinery in the engine room and the deckhouse, HVAC system, and the topside equipments. In general, the noise regulation for the offshore structure is severer than that of the cargo ship and acceptable noise limit of cabin is specified as 45 dB(A). This paper describes the procedure of noise analysis, the countermeasures of noise control, and the measurement results of the quay trial. In order to minimize the noise levels, careful attention have to be paid by the special committee of experts from the initial design stage to the delivery. Proper countermeasures, considering the characteristics of sources and receiver spaces, were applied from the noise prediction and various experiment results. Finally, this ship was successfully delivered with excellent noise properties. The technology to minimize the noise levels for FPSO has been established throughout the construction of this ship.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2000년도 추계학술대회논문집
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• pp.307-310
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• 2000

Recently, the demand for the Floating, Production Storage, and Offloading facility(FPSO) which has some economic and technical advantages, has increased in offshore oil production areas. The basic characteristics of a 343,000 DWT class FPSO which is being built in Hyundai Heavy Industries and shall be installed in offshore Angola, is almost same as that of oil carriers. However, she do not have self-propulsion system, but has additional facilities for oil production and positioning system. Main noise source contributing to the cabin noise of the accommodation, are classified into the machine in the engine room and the deckhouse, HVAC system, and the topside equipments. In general, the noise regulation for the offshore structure is much severer than that of the common commercial ships and the maximum acceptable sound pressure level of cabins is specified in 45dB(A). This paper describes the procedure of noise analysis along with its results. Noise analysis has been carried out for the case of emergency diesel generator running condition and the case of normal production condition and the results has been compared with the measurement results of the first case. Based on the results, proper countermeasures to reduce excessive noise level has been applied considering the characteristics of sources and receiver spaces and can be satisfied the specifications at all spaces.

• 보존과학회지
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• 제35권1호
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• pp.51-60
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• 2019

This paper provides quantitative data that describes the evolution of the air quality in the Whale and Sea Museum, located in the Iwate prefecture, collected after the 2011 Great East Japan Earthquake and tsunami. The museum was damaged significantly by the disaster, and restoration works continued for over six years. The air quality in the temporary storage facility and museum was monitored during the rehabilitation process. Evaluation of air quality is carried out by gas chromatography- mass spectrometry, ion chromatography and high-performance liquid chromatography. The results showed that the characteristics of the chemical components differed depending on the measurement locations inside the building. The museum atmosphere tended to be alkaline as the airtightness increased because of the maintenance works at the entrance. It was also determined that it was necessary to study the intake/exhaust routes and to clean them according to the contamination degree. In Japan, there are recommended museum air quality standards for acetic acid, formic acid, alkali, and aldehydes. The results indicated that these standards should not be used as a reference for damaged museums. Furthermore, at the temporary storage facilities for to store the collections during the rehabilitation of the museum, solvents such as ethyl benzene, toluene, and xylene are initially abundant, although they can be reduced by ventilation, while other components such as 2E1H was confirmed in this case are likely to remain.

• Journal of Platform Technology
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• 제6권4호
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• pp.49-58
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• 2018

복합재난은 과거 보다 더 많은 피해 및 손실을 발생시킨다. 예상치 못한 결과를 발생 시킬 수 있기 때문에 항상 대비되어야 한다. 특히 원자력발전소와 같은 시설에서의 사고는 기후상황에 따라 큰 문제를 야기 시킬 수 있기 때문에 문제 발생에 따른 다양한 상황을 가정하고 모의실험을 통해 연구가 선행되어야 한다. 본 연구에서는 복합재난 대응을 위한 시스템을 설계하고 이 시스템 연구를 위해 필요한 요소기술들을 정의해 보았다. 기본적으로 고성능 컴퓨팅과 대용량 데이터를 기반으로 하는 계층적 구조의 시스템을 구성하였다. 시스템 개발을 위해 융합분야에서 미들웨어 연구 만 아니라 응용분야 연구, 데이터 연구, 의사결정지원 서비스 연구가 필요하다.

• 방사성폐기물학회지
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• 제20권1호
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• pp.119-126
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• 2022

This study provides technical information about the nuclear fuel handling process, which consists of various subprocesses starting from new fuel receipt to spent fuel shipment at a nuclear power plant and the design requirements of fuel handling equipment. The fuel handling system is an integrated system of equipment, tools, and procedures that allow refueling, handling and storage of fuel assemblies, which comprise the fuel handling process. The understanding and reaffirming of detailed code requirements are requested for application to the design of the fuel handling and storage facility. We reviewed the design requirements of the fuel handling equipment for its adequate cooling, prevention of criticality, its operability and maintainability, and for the prevention of fuel damage and radiological release. Furthermore, we discussed additional technical issues related to upgrading the current code requirements based on the modification of the fuel handling equipment. The suggested information provided in this paper would be beneficial to enhance the safety and the reliability of the fuel handling equipment during the handling of new and spent fuel.

• Nuclear Engineering and Technology
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• 제55권1호
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• pp.238-247
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• 2023

The present work represents a technical guideline for decommissioning a disused teletherapy machine model Theratron-780 and contains category one ⁶⁰Co radioactive source. The first section predicts the dose rate from the source in case of normal and radiological emergency situations via FLUKA-MC simulation code. Moreover, the dose assessment for the occupational during the whole process is calculated and compared to the measured values. A suggested cordoned area for safety and security in a radiological emergency is simulated. The second section lists the whole process's technical procedures, including (preview, dismantle, securing, transport and storage) of the disused teletherapy machine. Results show that the maximum obtained accumulated dose for occupational were found to be 24.5 ± 4.9 μSv in the dismantle and securing process in addition to 3.5 ± 1.8 μSv during loading on the transport vehicle and unloading at the storage facility. It was found that the measured accumulated dose for workers is in good agreement with the estimated one by uncertainty not exceeding 5% in normal operating conditions.

• 한국산업융합학회 논문집
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• 제26권5호
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• pp.757-763
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• 2023

Major industrial accidents in which workers die due to fires or explosions while working at chemical substance handling workplaces continue to occur. Among the major industrial accidents that occurred between 2005 and 2021, the accident status by work situation and equipment was analyzed. Through analysis, it was confirmed that storage, reaction, and piping facilities were the main causes of the accident, and a self-checklist for each facility was developed. Verification was conducted through the supply and use groups to evaluate the suitability of the use, duties, and items of the self-checklist. The user group showed higher satisfaction than the supplier group for all three suitability of use, job, and item. In particular, since the inspection items of the self-checklist were organized around the cause of the accident derived through the analysis of actual accident cases, the satisfaction level was high in all groups. It is expected that the self-checklist developed through this study will be useful not only for large companies but also for small and medium-sized chemical industries that lack professional manpower.

• 방사선산업학회지
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• 제17권4호
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• pp.519-532
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• 2023

Spent nuclear fuel(SNF) is stored in nuclear power plants for a certain period of time and then transported to an interim storage facility. After that, SNF is finally repackaged in a disposal canister at an encapsulation plant for final disposal. Finland and Sweden, leading countries in SNF disposal technology, have already completed designing of spent fuel encapsulation plant. In particular, the encapsulation plant construction in Finland is near completion. When it comes to South Korea, as the amount of SNF production and disposal plan is different from those in Finland and Sweden, it is difficult to apply the concepts of these contries as is. Therefore, it is necessary to establish the spent fuel repackaging concept and to derive each operating and repackaging procedures by considering annual disposal plan of South Korea. The results of this study is expected to be used to establish the concept of optimized encapsulation plant through further research.

• 한국컴퓨터정보학회논문지
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• 제16권2호
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• pp.141-151
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• 2011

본 논문에서는 미래농업의 핵심기술로 각광 받고 있는 식물공장의 안전하고 효과적인 운용을 위해, 식물공장 내부에 설치된 센서나 설비 장치가 정상적으로 작동하는지 실시간으로 진단하고, 내부 환경 및 설비의 제어상태를 모니터링 하는 식물공장 시설관리 시스템을 제안한다. 본 시스템은 데이터관리 모듈, 상황정보제공 모듈, 상황분석 모듈, 서비스제공 모듈, 정보저장소 모듈, 사용자 인터페이스 모듈로 구성된다. 이러한 각 모듈간의 상호작용을 통해 오작동 진단 서비스, 설비장치 제어 서비스, 고 신뢰성 모니터링 서비스를 제공한다. 오작동 진단 서비스는 식물공장 내부에 설치된 센서나 설비 장치의 오작동여부를 판단하고 관리자에게 통보하는 기능을 수행한다. 설비장치 제어 서비스는 설비의 오작동을 진단하는 과정에서 제어의 필요성이 판단 될 경우 해당 기기를 제어한다. 고 신뢰성 모니터링 서비스는 오작동 진단 서비스를 통해 검증된 데이터를 관리자에게 제공한다. 제안한 시스템의 시뮬레이션을 통하여 각 서비스가 정상적으로 동작함을 확인하였다.