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정재후(Jae Hoo Jung),윤지섭(Ji Sup Yoon),김영환(Young Hwan Kim),진재현(Jae Hyoun Jin) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The dry pulverizing/mixing device is used to deal with the spent fuels for the safe disposal. The separated pellets from hulls by a slitting device are put and oxidized from UO₂ solid pellet to U:08 powder in the device. The device have been developed based on a voloxidation method which is one of several dry de-cladding methods. We have bench marked dry de-cladding methods, analyzed applicability to the advanced spent fuel management, integrated and compared several configuration, and finally derived detailed specifications. proper to requirements for the device. Also. thermal characteristics of the device such as thermal stress and strain have been analyzed by the commercial software. I-DEAS. and the reliability of the results have been verified by the KOLAS (KOrea Laboratory Accreditation Scheme). The DO₂ solid pellets arc put in the device which has a capacity of 20 kgHM per a batch. heated up about 600℃ in the air environment. Then. the UO₂ solid pellets are oxidized into the U₃O_8 powder. and the powder is collected in a special vessel. The device has been designed and developed as follows: the multi-staged fine hole meshes arc used to reduce the size of the powder gradually. heat and air(oxygen) are supplied continuously to reduce the reaction time. and slight vibration effect are applied to collect powder cling to the device.
정재후(Jae Hoo Jung),김영환(Young Hwan Kim),홍동희(Dong Hee Hong),박병석(Byung Suk Park),송태길(Tai Gil Song) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Performance test of decladding device was carried out by using simulated nuclear spent fuel rods after installing the device in ACPF(Advanced Spent Fuel Conditioning Process Facility). As a result of the test, it was confirmed that this device has a capability of treating 135 rodcuts(20 ㎏HM/batch) within 10 hours. And a procedure was prepared for the operation of the decladding unit process and the transportation to the subsequent unit process which produces powder from the fuel pellets separated from the 250 ㎜ length fuel rodcuts by decladding process. Data obtained from this procedure could be applied to a new decladding device design as a basic data for a scale-up facility in the future.
정재후(Jae Hoo Jung),윤지섭(Ji Sup Yoon),김영환(Young Hwan Kim),진재현(Jae Hyoun Jin),홍동희(Dong Hee Hong) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
A slitting device which is separating the pellets and hulls from the spent nuclear fuel rod cuts was developed. This device plays an important role in slitting the fuel rod cut into 3 parts in the axial direction of the rod cut. When the rod cuts are slitting in the device installed in the hot cell, if the pellets escape from the device through operator's carelessness, the hot cell is contaminated by the pellets. High level radiation emitting from the pellets lead to affect negatively the other devices in the hot cell. In connection with that problem, the existing device was improved by a series of experiments, and renewed for having higher treating capacity of spent nuclear fuels. The renewed slitting device can treat 20 kgHM/batch at a time, and employed in a scale of pilot or commercial plant for the process of nuclear fuel cycle in the future.
정재후(Jae Hoo Jung),박병석(Byung Suk Park),김영환(Young Hwan Kim),홍동희(Dong Hee Hong),윤지섭(Ji Sup Yoon),이종광(Jong Kwang Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In this study, we developed a decladding device which separates a simulated spent fuel rod with 250 ㎜ length into the pallets and the pieces of the hulls. To improve the performance of the equipment, we devised mechanisms to prevent the rod cut from being exposed or bounced into the hot-cell, to reduce the operation time, and to insert the rods automatically. The decladding device has some features such as the semi-automation of the loading/unloading procedures of the rod-cut, the automatic separation of the pellets and clad, and remote operability and maintainability, etc. The performance of the slitting device was tested by using the simulated fuel rod-cut. As a result of the performance test for some mockup fuel rod cuts in the ACP(Advanced Spent Fuel Conditioning Process) facility, it was verified that the decladding device could be applied to the actual fuel rod cut. Furthermore, the results of this study could be used for the design of a scale-up facility in the future.
정재후(Jae Hoo Jung),윤지섭(Ji Sup Yoon),김영환(Young Hwan Kim),엄재법(Jae Beop Uhm) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
We have developed a slitting machine which separates the UO₂ pallets from the fuel rod clad by slitting the 25㎝ long rod-cut. Since the device will be operated in a intense radiation field, the device should be radiation-tolerant, remotely operable and maintainable. Also the throughput of the device should be fast enough so that it can meet the requirements of the overall process. We introduced new design of the slitting device while considering these concerns. New design includes the semi-automation of the loading-unloading process of the rod-cut, the automatic separation of the pellets and clad, and remote operability and maintainability, etc. The performance of the slitting device was tested by using the simulated fuel rod-cut. Test results showed that over 95 % of fuel rods were successfully separated and over 40 % of the operation time was reduced.