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감손 우라늄 취급 중소형 글러브 박스 시스템의 설계,제작
구대서 ( Dae Seo Koo ),정동유 ( Dong You Chung ),이정민 ( Jung Min Lee ),정흥석 ( Hong Suk Chung ) 한국공업화학회 2012 응용화학 Vol.16 No.1
Small and medium-sized glove boxes for the handling of depleted uranium were designed and fabricated. We controlled the moisture and oxygen concentration to < 1 ppm and placed depleted uranium into the primary vessel of the hydrogen isotope storage bed. This system consists of a glove box, a purification system and an antechamber, etc. In this study, the characteristics of the small and medium-sized glove box system for the handling of depleted uranium are presented for each component. Operation examples of the glove box system are also presented. The fabricated small and medium-sized glove box system will be utilized for the fabrication of the hydrogen isotope storage bed.
구대서 ( Dae Seo Koo ),정동유 ( Dong You Chung ),정흥석 ( Hong Suk Chung ),이정민 ( Jung Min Lee ) 한국공업화학회 2011 응용화학 Vol.15 No.2
A vertical-type ZrCo bed was fabricated for recovery/delivery of hydrogen isotopes. The outer grooves and heater tubes was designed to have a good heat transfer. The helium loop and copper fins and the tube of helium loop inlet and the tube of helium loop outlet was prepared for a good heat transfer. To cool down the temperature of the ZrCo metal hydriding rapidly, the circulation of low temperature helium gas in helium loop and in tube in secondary vessel will be performed by using operating MBP602 and MBP302. And the test of recovery/delivery for vertical-type ZrCo bed will be performed. The temperature of primary vessel, ZrCo metal powder and the pressure of primary vessel will be measured, and the rates of recovery/delivery will be analyzed.
구대서 ( Dae Seo Koo ),정동유 ( Dong You Chung ),이지성 ( Ji Sung Lee ),정흥석 ( Hong Suk Chung ) 한국공업화학회 2011 응용화학 Vol.15 No.1
A hydriding/dehydriding DAQ (Data Acquisition) system has been designed and fabricated to measure the temperature and pressure exactly for a twosome SDS (Storage and Delivery System) bed. A DAQ program has been prepared by using a LabVIEW 2010. A DAQ system was composed of sensors, signals, signal conditioning, DAQ hardware, and DAQ software. The signals between temperature and pressure sensors and DAQ devices, a personal computer, have been sent and received by using a LAN (Local Area Network) protocol. The noise reduction and SNR (Signal-to-Noise Ratio) amplification have enabled the measurements of temperature/pressure from DAQ devices to be easy. The personal computer has enabled the control of pumps/heaters. In emergencies, manual manipulations have enabled the control of pumps. The control of heaters for dehydriding and vacuum annealing has been performed by using a PID (Proportional Integral Derivative) control system.
구대서 ( Dae Seo Koo ),이정민 ( Jung Min Lee ),박종철 ( Jong Chul Park ),정흥석 ( Hong Suk Chung ) 한국공업화학회 2013 응용화학 Vol.17 No.1
The absorption between hydrogen isotopes and storage materials (ZrCo or uranium) is an exothermic reaction. The exothermic reaction characteristics upon the hydriding of hydrogen isotopes with ZrCo and depleted uranium (DU) were investigated. The temperature increase due to a hydriding exothermic reaction during the powderization of DU was bigger than that of ZrCo. However, as the hydriding amount increases, the temperature increase owing to the hydriding reaction of the two metals was very similar.
정흥석 ( Hong Suk Chung ),구대서 ( Dae Seo Koo ),정동유 ( Dong You Chung ),정도연 ( Do Yeon Jeong ) 한국공업화학회 2010 응용화학 Vol.14 No.1
A tray type Zirconium-Cobalt (ZrCo) tritium storage bed with an“in-bed”gas flowing calorimetry function has been developed for a self-assaying system in a tritium storage and delivery system of nuclear fusion facilities. The ZrCo bed is installed in a primary vessel. And 6 kW cable heaters are brazed in the bottom of each tray. He loop tubes are brazed on the top side of each plate, and 32 W simulation heaters are also installed along the He loop. To evaluate characteristics of the He circulation loop for tritium inventory measurement, the He loop gas temperature increase (△T) was measured by using the simulation heaters.
이지성 ( Ji Sung Lee ),구대서 ( Dae Seo Koo ),정동유 ( Dong You Chung ),정흥석 ( Hong Suk Chung ) 한국공업화학회 2011 응용화학 Vol.15 No.1
Hydrogen isotope is a main fuel for nuclear fusion reactors like ITER (international thermonuclear experimental reactor). Metal hydride is considered for the storage of the hydrogen isotope. Hydrogen isotope absorption and desorption are carried out in a metal hydride bed. These reactions require heat removal and supply respectively. Therefore, rapid storage and delivery of tritium are enabled by rapid cooling and heating of the storage vessel. Rapid heating can be achieved with an electrical heater. However, rapid cooling is not easily achieved. A vertical type hydrogen isotope storage vessel containing 1250 g of ZrCo powder is designed to enhance the cooling performance. Two types of cooling method, an external helium circulation and an internal helium circulation loop, are proposed in this study. The transient cool down time from 350℃ to lower temperatures has been estimated. Details of heat transfer analysis and parametric study at each boundary condition are presented in this paper.
정흥석 ( Hong Suk Chung ),구대서 ( Dae Seo Koo ),정동유 ( Dong You Chung ),정도연 ( Do Yeon Jeong ) 한국공업화학회 2010 응용화학 Vol.14 No.1
A tritium plant, in a nuclear fusion facility, is comprised of the Tokamak Exhaust Processing (TEP) system, the Isotope Separation Systems (ISS), the Analytical System (ANS) and the Storage and Delivery System (SDS).The main function of the SDS is to store and supply hydrogen isotopes needed for Tokamak operation. The SDS bed is used for storing hydrogen isotopes as a metal hydride form. The focus is on the heating-up of the tray-type experimental SDS bed. The bed shows rapid heating-up characteristics, which is desirable for a rapid delivery of hydrogen isotopes by desorption from the metal hydride.
이정민 ( Jung Min Lee ),정동유 ( Dong You Chung ),구대서 ( Dae Seo Koo ),정흥석 ( Hong Suk Chung ) 한국공업화학회 2011 응용화학 Vol.15 No.2
Filtration is the most widely utilized technique for air cleaning and sampling, and is applied in a variety of industries, such as respiratory protection, air cleaning of smelter effluents, processing of nuclear and hazardous materials, and particle collection in clean rooms. The purpose of this research is to improve the collection performance of filtration. This study was mainly focused on the characterization of filters and the way to maintain optimal performance of filtration.
판형 ZrCo 수소동위원소 저장 Bed의 흡장 시작 온도에 따른 흡장 성능의 변화
정동유 ( Dong You Chung ),이지성 ( Ji Sung Lee ),구대서 ( Dae Seo Koo ),정흥석 ( Hong Suk Chung ) 한국공업화학회 2011 응용화학 Vol.15 No.1
A metal hydride bed for the storage and delivery of hydrogen isotopes is one of the essential components of the tokamak fuel cycle. For the development of a metal hydride bed, rapid delivery/recovery rates according to the tokamak operation scenario and accurate and rapid measurement of tritium inventory are major concerns. To achieve these requirements, it is important to design an operation scenario for rapid cooling performance. Therefore we should know the highest temperature of the bed without significant decrease of hydriding performance to minimize cooling time. In this study, we present the hydriding characteristics of ZrCoHx SDS bed with different initial hydriding temperatures.
이정민 ( Jung Min Lee ),박종철 ( Jong Chul Park ),구대서 ( Dae Seo Koo ),정동유 ( Dong You Chung ),정흥석 ( Hong Suk Chung ) 한국공업화학회 2013 응용화학 Vol.17 No.1
With an increasing demand for energy, the importance of nuclear fusion energy is increasing. Hydrogen isotopes are a main fuel for nuclear fusion reactors. Metal hydride former offers a safe and convenient method for hydrogen isotope storage. The storage of hydrogen isotopes is carried out by absorption and desorption in a metal hydride bed. These reactions require heat removal and supply respectively. Accordingly, the rapid storage and delivery of hydrogen isotopes are enabled by rapid cooling and heating of the metal hydride bed. In this study, a vertical-type hydrogen isotope storage bed is manufactured to enhance the cooling performance. We present the experimental details of the cooling of the bed.