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DEVELOPMENT OF PYROPROCESSING AND ITS FUTURE DIRECTION
TADASHI INOUE,LOTHAR KOCH 한국원자력학회 2008 Nuclear Engineering and Technology Vol.40 No.3
Pyroprocessing is the optimal means of treating spent metal fuels from metal fast fuel reactors and is proposed as a potential option for GNEP in order to meet the requirements of the next generation fuel cycle. Currently, efforts for research and development are being made not only in the U.S., but also in Asian countries. Electrorefining, cathode processing by distillation, injection casting for fuel fabrication, and waste treatment must be verified by the use of genuine materials, and the engineering scale model of each device must be developed for commercial deployment. Pyroprocessing can be effectively extended to treat oxide fuels by applying an electrochemical reduction, for which various kinds of oxides are examined. A typical morphology change was observed following the electrochemical reduction, while the product composition was estimated through the process flow diagram. The products include much stronger radiation emitter than pure typical LWR Pu or weapon-grade Pu. Nevertheless, institutional measures are unavoidable to ensure proliferation-proof plant operations. The safeguard concept of a pyroprocessing plant was compared with that of a PUREX plant. The pyroprocessing is better adapted for a collocation system positioned with some reactors and a single processing facility rather than for a centralized reprocessing unit with a large scale throughput.
Sensing System for Inner Temperature of Combustion Gas by Using Infrared CT
Tadashi Ito,Kinnosuke Masuda,Takeshi Nakazawa 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
We have developed a reconstruction algorithm for non-contact measurement of temperature and absorption of combustion gas distributed in a flame. To get accurate temperature distribution of the combustion gas, the absorption of the gas must be known. We achieve this by obtaining the projections of thermal radiation from the flame and an external radiation source which is turned on and off while obtaining projections. We can reconstruct the distribution from the projections by using an emission computed tomography (CT) algorithm. We have developed a prototype measurement system and made some experiments to measure temperature and absorption distribution of methane-air flame of a Bunsen burner.