Journal of Nuclear Science and Technology
Online ISSN : 1881-1248
Print ISSN : 0022-3131
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Volume 3, Issue 4
Displaying 1-7 of 7 articles from this issue
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  • Effect of Void Volume Variation on Pressure Buildup in Vibratory Compacted UO2 Fuel Element
    Tadashi KUBOTA, Tadahide NOHARA, Shuichiro TAKAHASHI
    1966 Volume 3 Issue 4 Pages 125-130
    Published: 1966
    Released on J-STAGE: February 28, 2008
    DOIhttps://doi.org/10.3327/jnst.3.125
    JOURNAL FREE ACCESS
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    The effect of void volume variation on pressure buildup in a vibratory compacted UO2 fuel element was studied.
    (1) The present paper describes the apparatus and the experimental procedure for measuring void volume in vibratory compacted UO2 fuel element.
    (2) It is indicated from a comparison of the ratio of void volume to total inner volume of fuel element and the ratio of total inner volume of fuel element minus calculated volume of UO2 to total inner volume of fuel element that no particle bonding occurred and also that no additional closed pores were generated during vibratory compaction.
    (3) Thermal simulation experiments resulted in void volume decrease by microstructural changes such as sintering phenomena and densification.
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  • A Numerical Analysis of Reactor Kinetics by Digital Computer
    Yoichi FUJIIE, Keiji MIYASAKI
    1966 Volume 3 Issue 4 Pages 131-139
    Published: 1966
    Released on J-STAGE: February 28, 2008
    DOIhttps://doi.org/10.3327/jnst.3.131
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    Numerical analysis of typical reactor kinetics problems is made with a digital computer. In the description of recurrence relation, several equivalent reciprocal periods of time are proposed to reduce difficulty in treating the discontinuity of reactivity and to improve accuracy in computation. A vari-able time interval corresponding to the prevailing state is also introduced to save machine time.
    The results obtained show fairly good agreement with rigorous solutions evaluated analytically for step inputs of reactivity, and also incorporate nonlinear effects when referred to the linearized approximation for sinusoidal inputs of reactivity.
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  • The Isotope Effect in the Electromigration of Sodium-Ion in Fused Sodium Nitrate
    Nobufusa SAITO, Isao TOMITA, Isao OKADA
    1966 Volume 3 Issue 4 Pages 140-143
    Published: 1966
    Released on J-STAGE: February 28, 2008
    DOIhttps://doi.org/10.3327/jnst.3.140
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    The isotope effect of sodium-ion in countercurrent electromigration (Klemm's method) has been investigated for a system of fused sodium nitrate labelled with the radioactive nuclide 22Na. Two runs were made (Experiments A and B, respectively). In Experiment A, the fused salt chain, Al(cathode)-NaNO3-Pt(anode) was electrolyzed for 20 hr at 340 ?? with a current density of 1.3 A/cm2 in the separating tube. In Experiment B, electrolysis was carried out for 67 hr at 380 ?? with a current density of 1.5 A/cm2 in the separating tube. After electromigration, a change was observed in the specific activity of sodium in the separating tube. The elementary process separation factor, defined as the ratio of the mobilities of the isotopic ions, i.e., VNa-22/VNa-23, was calculated to be 1.0023 for Experiment A and 1.0017 for B. The mass effect for sodium ion in fused sodium nitrate was calculated to be -0.045±0.006 (standard deviation).
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  • Radiation Damage to TBP/Kerosene Solvent, (II)
    Effect on Extraction Behavior of Uranium and Thorium and on their Loading Effect
    Takeshi TSUJINO, Takehiko ISHIHARA
    1966 Volume 3 Issue 4 Pages 144-149
    Published: 1966
    Released on J-STAGE: February 28, 2008
    DOIhttps://doi.org/10.3327/jnst.3.144
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    Radiation damage to 30 v/o TBP/kerosene was investigated to determine changes in the extraction behavior of uranium and thorium with the solvent irradiated up to 108 R in nitrate system and similarly in the stripping behavior with 0.01 N nitric acid.
    The effect on uranium and thorium was discernible only with irradiations reaching 108 R. Changes in the behavior of fission products present in company with uranium or thorium were found to be the similar to the case where they existed free of uranium or thorium. At irradiations below 107 R, uranium and thorium manifested loading effect, but it disappeared when irradiation reached 108 R.
    Calculation of one stage decontamination factors of fission products from uranium and thorium confirmed deterioration of the power of separation with irradiation, and the degree of deterioration was determined quantitatively. The decontamination factor for 95Zr-95Nb was decreased to 1/2, 000 by irradiation to 108 R, while the same dosage of irradiation had little effect for 106Ru-106Rh.
    Physical properties such as density, viscosity, emulsification tendency and phase separation time were also observed to be effected by irradiation to 108 R.
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  • Reactivity Worth of Fuel Elements
    Measurement and Perturbation Analysis
    J.Tsunetaka WAJIMA, Tadahiro OHNISHI, Kazuhiro KIYOKAWA
    1966 Volume 3 Issue 4 Pages 150-159
    Published: 1966
    Released on J-STAGE: February 28, 2008
    DOIhttps://doi.org/10.3327/jnst.3.150
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    (8) BOHL, H., Jr., HEMPHILL, A.P.: WAPD-TM- 218, (1961).
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  • One-Phonon Coherent Scattering of Slow Neutrons from Polycrystalline Aluminum
    Shungo IIJIMA
    1966 Volume 3 Issue 4 Pages 160-164
    Published: 1966
    Released on J-STAGE: February 28, 2008
    DOIhttps://doi.org/10.3327/jnst.3.160
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  • On the Disadvantage Factor in a Closely Packed Cylindrical Lattice
    Yuzo FUKAI
    1966 Volume 3 Issue 4 Pages 165-168
    Published: 1966
    Released on J-STAGE: February 28, 2008
    DOIhttps://doi.org/10.3327/jnst.3.165
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