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1-22 Touch-Down Test of Magnetic Bearing Type Centrifugal Contactor with Irradiated Touch-Down Bearing H. Ogino, K. Fujisaku and H. Hirano Nuclear Cycle Engineering Department, NFCEL, JAEA The centrifugal contactor has excellent phase separation and a smaller hold-up volume than any other contactor type such as mixer-settler and pulsed column. These characteristics lead to “rapid start-up and shut-down”, “compact design” and “less solvent degradation”. Therefore, the centrifugal contactor is said to be advantageous for reprocessing a fast breeder fuel of high burn-up and high Pu-enrichment 1) , and study and development have been progressed since the 1960s. In JAEA, the rolling bearing type centrifugal contactor with anti-corrosion design (include air purge system, ceramic-bearing and others) has been developed and has achieved to 5,000 hours of operation without significant troubles. However, the grease becomes deteriorated by acid mist, temperature and other environmental factors, and 2) that also affects the service life . To provide a possible resolution to this technical issue, we have developed the centrifugal contactor of non-contact journaled construction 3) using magnetic bearings without grease . A magnetic bearing has the construction in which the attractive force of electromagnets is exerted to levitate a rotor without mechanical contact. Figure 1 shows the overview of irradiated magnetic bearing type centrifugal contactors and the structure of magnetic bearing. We carried out the gamma-ray irradiation test of centrifugal contactor with magnetic bearing system to estimate the radiation resistance in 2008. The equipments stopped several times under irradiation, and were not finally reactivated of two different factors, one was abrasion of the touch-down bearing and adhesion to the main shaft (shown in Fig. 2), the other was a trouble of IC. Accumulated dose of the equipments was 3.7- 4.7 × 10 8 R. Therefore, the present work is intended to investigate whether the cause of the stop with the touch-down bearing is an influence of gamma-ray irradiation. Motor Rotor Fig. 1 Irradiated magnetic bearing type centrifugal contactors and structure of magnetic bearing. JAEA-Review 2010-065 Thrust magnetic bearing Upper touch-down bearing Radial magnetic bearing Lower touch-down bearing Main shaft - 26 - The touch-down test were continuously carried out 6 runs (1run: 5 times touch-down) using the magnetic bearing type centrifugal contactor to which irradiated the lower touch-down bearing (a slide bearing formed of polyimide resin) was put in. So we observed the touch-down bearing, the main shaft, etc and monitored the control situation of magnetic-bearing after the touch-down test. Gamma-ray was irradiated to the lower touch-down bearing up to about 10 9 R at a rate of 17.3 kGy/h at room temperature. Figure 3 shows the observation result after the touch-down test (6 runs, 1 × 10 9 R). As shown in Fig. 3, neither abrasion of the touch-down bearing nor adhesion to the main shaft was observed. Moreover, the problem did not occur to control situation of the magnetic-bearing. Based on these results, we concluded that polyimide resin was a material which could be used under these system requirements. In the future, we will carry out gamma-ray irradiation test of improvement equipment which reflected these results again. Main shaft and adhesion material Fig. 2 Main shaft of No.1 equipment after the irradiation test (4.7 × 10 8 R). Lower touch-down bearing Main shaft Fig. 3 Main shaft and lower touchdown bearing after the touch-down test (6 runs, 10 9 R). References 1) G. J. Bernstein et al., ANL-7969 (1973). 2) T. Washiya et al., Proc. Global 2005 (2005). 3) N. Okamura et al., Proc. Global 2007(2007).
1-23 Studies on Microstructure and Elemental Distributions of Barrier Materials for Geological Disposal of Radioactive Waste N. Miyasaka a) , K. Yoshi a) , T. Kozaki b) , S. Sato b) , N. Kozai c) , M. Kohka d) , T. Satoh d) and T. Kamiya d) a) Graduate School of Engineering, Hokkaido University, b) Faculty of Engineering, Hokkaido University, c) Advanced Science Research Center, JAEA, d) Department of Advanced Radiation Technology, TARRI, JAEA A compacted Na-bentonite, of which major mineral is montmorillonite having high swelling ability and low hydraulic conductivity, is a candidate buffer material in geological disposal of high-level radioactive waste. However, Na-bentonite would change if its exchangeable cations of Na + are replaced with Fe 2+ which can be released from corrosion of carbon steel waste containers. Therefore, the performance as the buffer should be evaluated in a proper way not only for Na-bentonite but also for Fe(II)-bentonite. In a hydraulic conductivity measurement for Fe(II)-bentonite, Fe 2+ in the sample are easily oxidized and precipitated under the presence of oxygen. Similarly, some fraction of Fe 2+ in the sample may be precipitated as a result of hydrolysis if the sample is kept contact with fresh water for long time. Therefore, the stability of Fe(II)-bentonite during the measurement is a key issue to be studied so as to evaluate its hydraulic conductivity. In this study, Fe(II)-montmorillonite before and after the hydraulic conductivity measurements were characterized by chemical analyses. In addition, a micro-PIXE analysis was conducted for the samples to find the precipitation of iron in the samples. The Fe(II)-montmorillonite was prepared from Na-montmorillonite by a modified ion-exchange reaction using Fe(II)-nitrilotriacetate complex solution. Total amounts of exchangeable cations in the samples before and after the hydraulic conductivity measurement were determined by ICP-AES after extracted with 0.1 M KCl solution. The ratios of Fe(II) to total Fe extracted from the samples were determined by colorimetry. Detail procedures of the chemical analyses are described 1) elsewhere . The samples for micro-PIXE analyses were prepared by drying the suspension of the sample which had been dropped on a graphite plate. The hydraulic conductivity measurements by constant head method were conducted at dry densities of 0.8 and 1.0 Mg m -3 for about 30 days under a room temperature. Amount of distilled water passed through the sample during the experiment was 3.6 × 10-5 m 3 and 2.5 × 10-6 m 3 per 1 g-clay at dry densities of 0.8 and 1.0 Mg m -3 , respectively. The samples were handled under oxygen-free condition except a moment to set the sample on a sample holder of the micro-PIXE system. Table 1 shows the results of chemical analyses for Fe(II)- sample before and after the hydraulic conductivity JAEA-Review 2010-065 - 27 - measurement at the dry density of 0.8 Mg m -3 . Although no oxidation of Fe(II) occurred, Fe content was found to decrease during the measurement. Figure 1 shows two-dimensional elemental mappings of Si, Al and Fe for the Fe(II)-sample after the hydraulic conductivity measurement. The region where only Fe has high content (as indicated with circles in the figure) appeared after the hydraulic conductivity measurement. These findings suggest that small fraction of Fe(II) ions in the Fe(II)-sample are precipitated between montmorillonite particles during the measurement. In general, Fe 2+ ions precipitated in micro pores may reduce the hydraulic conductivity, whereas Fe 2+ ions precipitated over montmorillonite particles may inhibit their swelling, resulting in high hydraulic conductivity. However, the hydraulic conductivities observed were kept constant during the whole period of the measurement at both dry densities. This suggests that at least small amount of the precipitation has no or negligibly small impact on the hydraulic conductivity. Reference 1) J. Manjanna et al., J. Nucl. Sci. Tech. 44 (2007) 929. Table 1 Exchangeable cations and Fe(II)/Fe(total) ratio of Fe extracted from Fe(II)-samples before and after hydraulic conductivity measurement at dry density of 0.8 Mg m -3 . Exchangeable cation [meq/100g] Fe(II)/Fe(total) Na Ca Fe [%] Before 3 2 101 100 After 1 3 92 100 Fig. 1 Two-dimensional elemental mappings of Si, Al and Fe for Fe(II)-sample after hydraulic conductivity measurement at dry density of 0.8 Mg m -3 .
Page 3 and 4: JAEA-Review 2010-065 JAEA Takasaki
Page 5 and 6: JAEA-Review 2010-065 PREFACE This r
Page 7: JAEA-Review 2010-065 and pulsed hea
Page 10 and 11: JAEA-Review 2010-065 1-23 Studies o
Page 12 and 13: JAEA-Review 2010-065 3-24 Lethal Ef
Page 14 and 15: JAEA-Review 2010-065 4-07 Fabricati
Page 16 and 17: JAEA-Review 2010-065 5. Status of I
Page 18 and 19: JAEA-Review 2010-065 1-13 Alpha-rad
Page 21 and 22: 1-01 Radiation Resistance of InGaP/
Page 23 and 24: 1-03 Evaluation of Soft Error Rates
Page 25 and 26: 1-05 Heavy-ion Induced Current in S
Page 27 and 28: Total Ionizing Dose Tolerance of Si
Page 29 and 30: 1-09 Evaluation of Single Event Eff
Page 31 and 32: Hydrogen Diffusion in a-Si:H Thin F
Page 33 and 34: 1-13 Alpha-radiolysis of Organic Ex
Page 35 and 36: Study on Stability of Cs·Sr Solven
Page 37 and 38: Irradiation Effect of Gamma-Rays on
Page 39 and 40: 1-19 Development of Radiation Resis
Page 41: 1-21 Alpha-Ray Irradiation Damage o
Page 45 and 46: 1-25 Effect of Groundwater Radiolys
Page 47 and 48: 1-27 Simulation of Neutron Damage M
Page 49 and 50: 1-29 Irradiation Hardening in Ion-i
Page 51 and 52: 1-31 Preparation of Anion-Exchange
Page 53 and 54: 1-33 Radiation-Induced Graft Polyme
Page 55: JAEA-Review 2010-065 2. Environment
Page 58 and 59: 2-02 Development of Zwitterionic Mo
Page 60 and 61: Modification of Hydroxypropyl Cellu
Page 62 and 63: The Recovery of Precious Metals Usi
Page 64 and 65: 2-08 ESR Study on Carboxymethyl Chi
Page 67 and 68: JAEA-Review 2010-065 3. Biotechnolo
Page 69 and 70: JAEA-Review 2010-065 3-28 Electron
Page 71: JAEA-Review 2010-065 3-51 PET Studi
Page 74 and 75: 3-02 Mutagenic effects of He ion pa
Page 76 and 77: 3-04 Functional Analysis of Flavono
Page 78 and 79: 3-06 Generation New Ornamental Plan
Page 80 and 81: 3-08 Stability of Flower-colour Mut
Page 82 and 83: 3-10 JAEA-Review 2010-065 Effects o
Page 84 and 85: 3-12 Producing New Gene Resources i
Page 86 and 87: 3-14 Production of Soybean Mutants
Page 88 and 89: Assessment of Irradiation Treatment
Page 90 and 91: 3-18 Effect of Different LET Radiat
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3-20 JAEA-Review 2010-065 Fungicide
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3-22 JAEA-Review 2010-065 FACS-base
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3-24 Lethal Effects of Different LE
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3-26 JAEA-Review 2010-065 Ion Beam
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3-28 Electron Spin Relaxation Behav
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3-30 Target Irradiation of Individu
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3-32 Carbon-ion Microbeam Induces B
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3-34 Biological Effects of Carbon I
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3-36 Difference in Bystander Lethal
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3-38 Analysis of Lethal Effect Medi
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3-40 Irradiation with Carbon Ion Be
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3-42 Expression of Two Gelsolins in
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3-44 Analysis of Bystander Cell Sig
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3-46 Quantitative Evaluation of Ric
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3-48 Visualization of 107 Cd Accumu
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3-50 Uniformity Measurement of Newl
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3-52 Imaging and Biodistribution of
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3-54 Improvement of Spatial Resolut
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3-56 The Optimum Conditions in the
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3-58 Evaluation of Cisplatin Concen
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3-60 JAEA-Review 2010-065 Analysis
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3-62 JAEA-Review 2010-065 Sensitivi
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JAEA-Review 2010-065 4-14 The Effec
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JAEA-Review 2010-065 4-39 Relations
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4-01 Hydrogen Gasochromism of WO3 F
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4-03 Synthesis of Single-Crystallin
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4-05 Synergy Effects in Electron/Io
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Fabrication of Diluted Magnetic Sem
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4-09 Gas Permeation Characteristics
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4-11 Control of Radial Size of Poly
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4-13 Behavior of N Atoms in Nitridi
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4-15 JAEA-Review 2010-065 Annealing
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Low Temperature Ion Channeling of F
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4-19 Radiation-Induced Electrical D
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4-21 Study on Cu Precipitation in E
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4-23 Evaluation of Fluorescence Mat
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4-25 Evaluation of the ZrC Layer fo
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4-27 Structure Analysis of K/Si(111
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4-29 LET Effect on the Radiation In
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4-31 Stabilization of Measurement S
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Systematic Measurement of Neutron a
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4-35 Measurement of Neutron Fluence
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4-37 Evaluation of the Response Cha
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4-39 Relationship between Internucl
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4-41 Analysis of Radiation Damage a
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4-43 Positive Secondary Ion Emissio
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4-45 JAEA-Review 2010-065 Ion Induc
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4-47 Fabrication of Dielectrophoret
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4-49 Fast Single-Ion Hit System for
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4-51 Development of Beam Generation
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JAEA-Review 2010-065 5. Status of I
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Operation of the AVF Cyclotron T. N
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Operation of Electron Accelerator a
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5-06 FACILITY USE PROGRAM in Takasa
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5-08 Radioactive Waste Management i
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Appendix 2 List of Related Patents
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Appendix 4 Type of Research Collabo
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表1.SI 基本単位基本量 SI
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