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Volume 8, Issue 12
Displaying 1-13 of 13 articles from this issue
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Toshikazu TAKEDA, Tamotsu SEKIYA1971 Volume 8 Issue 12 Pages 663-672
Published: December 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSA new first-flight collision probability that takes into account the effect of the anisotropic scattering in the moderator is derived in a cylindrical cell. This probability is obtained by expanding the scattering kernel, angular flux and angular source into spherical harmonics series and retaining the first two terms in the integral Boltzmann equation. Making use of a new reciprocity relation and the conservation law, we introduce the probability relevant to a lattice cell under the condition that all neutrons impinging on the cell boundary should reflect with isotropic distribution back into the original cell. This probability also satisfies both the usual reciprocity theorem and the conservation law. Though we have here treated only a 2-medium problem, the method can be easily extended to the problem of a cell containing many regions. As an example of application, we calculate the flux ratios in a two region cell by one-group theory and the neutron spectra in fuel and moderator using the Fermi-age kernel in the moderator and wide resonance approximation in the fuel.View full abstractDownload PDF (652K) -
Keiji MIYAZAKI, Yoichi FUJII-E, Tokuo SUITA1971 Volume 8 Issue 12 Pages 673-681
Published: December 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSTrends observed in the experimental data of increasing deviation of pressure wave velocity from the nonslip homogeneous model, reported in Part (I), are explained from consideration of slip between the phases. The slip reduces the inertial effect of liquid and consequently brings about an increase in the wave propagation velocity.
In order to testify quantitatively to the above interpretation by analysis of observed data, the theoretical approaches of perturbation method and Fourier transformation in time and space were applied to the fundamental equations of mass and momentum of each phase, taking the interaction between the phases as a function of the relative velocity only. The propagation velocities dependent on frequency were calculated from the characteristic equation derived by the above procedure, and fairly good agreement was obtained between theoretical and experimental data arranged with frequency as parameter.
Applicability of linearization theory and relaxation of shock formation are physically discussed, and they are attributed also to attenuation effect by slip.View full abstractDownload PDF (624K) -
Preparation of Plutonium Metal by Calcium Reduction of Sodium Plutonium (IV) FluorideTaneaki YAHATA, Tadasumi MUROMURA, Kinji OUCHI, Yasuichi SASAKI, Naoki ...1971 Volume 8 Issue 12 Pages 682-684
Published: December 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSA method of producing Pu metal by the reduction of sodium plutonium (IV) fluoride is reported. After the valency of Pu in acidic solution was adjusted to tetravalent state by addition of nitrite (e. g. NaNO2), sodium plutonium (IV) fluoride was precipitated by adding hydrofluoric acid in the presence of sodium ion in the solution.
The double salt obtained by the wet method was dried under reduced pressure at 110°C, and then reduced with Ca metal in Ar atmosphere. Over 80% Pu yield was obtained by reducing 1g batch of the double salt.View full abstractDownload PDF (169K) -
Teruko SAWAI1971 Volume 8 Issue 12 Pages 685-689
Published: December 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThe ionic processes of γ-irradiated triphenylamine (TPA) in 3-methylpentane glass (3-MP) have been studied. The thermoluminescence curve of the irradiated sample shows two maxima at 77°∼83°K and 83°∼90°K. The effects of differences in radiation dose and of time elapsed after irradiation at 77°K on the luminescence yield of these two peaks have been examined. The optical absorptions of trapped electrons (e-t), TPA+ and TPA- are measured as functions of the storage time at 77°K and of the elevation of temperature. The results for IR and UV bleaching and for prolonged storage at 77°K suggest the presence of negative species other than e-t and TPA-. In the irradiated sample at 77°K in the presence of 10-4∼10-3M TPA, positive and negative species other than TPA+ and TPA- exist and these charges are transferred to TPA to form TPA+ and TPA- by warming. These behaviors of the ionic species are discussed.View full abstractDownload PDF (269K) -
Influence of Heat Transfer Characteristics on the Flow StabilityRyoichi TAKAHASHI, Masuo SHINDO1971 Volume 8 Issue 12 Pages 690-695
Published: December 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThe kinetic behavior of two-phase flow is considered by conventional linear control theory. This study considers only the essential factors so as to simplify the interpretation of the mechanisms involved in the observed phenomena. A change in heat flux due to a change in coolant velocity is taken into account to study the influence of heat transfer characteristics on the flow stability. While this influence has not appeared as clearly as in the previous numerical experiment(1), agreement was obtained with measurements reported from RWD RL.View full abstractDownload PDF (366K) -
Taiju ITO, Chiyoji KAWAGUCHI1971 Volume 8 Issue 12 Pages 696-702
Published: December 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThe reliability of a simplified model of ractor instrumentation possessing redundancy in its system is studied. The unreliability is obtained for a 2-out-of-3 system with a limited number of spare units, for the case where the replacement of the failed unit by a spare unit is not instantaneous. Two methods for the solution are obtained. The results are then compared with that obtained from Jacobs' formula for a rate of false scrams, and the accuracy of Jacobs' formula is discussed. It is shown that Jacobs' formula can be used only when the duration of operation is larger than several times the reset time, which must be a constant. But in actuality this reset time depends on such factors as the number of spare units provided, and the time required for replacement.View full abstractDownload PDF (486K) -
Hiroshi BABA, Hiroshi OKASHITA, Sumiko BABA, Toshio SUZUKI, Hirokazu U ...1971 Volume 8 Issue 12 Pages 703-712
Published: December 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSA method for rapidly analyzing the γ spectrum obtained with Ge(Li) detectors was developed for a medium-size electronic computer. The analysis is based on the first derivative method, associated with a number of peak-shape tests. The effects of data smoothing and of changes in peak width were studied to determine the optimum conditions for spectrum analysis. The resulting computer program was subjected to various quality tests on the predicted values of the peak position and area. The results of the tests showed that the code thus developed works quite satisfactorily. The code requires 10sec and a memory core of 29k when using a FACOM 230-60 for the analysis of a 2, 047 channel spectrum.View full abstractDownload PDF (694K) -
Hisashi YAMAMOTO, Shin-ichi ITO1971 Volume 8 Issue 12 Pages 713-715
Published: December 25, 1971
Released on J-STAGE: December 19, 2008
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Fumio KIKUCHI, Yoshio ANDO1971 Volume 8 Issue 12 Pages 715-717
Published: December 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSDownload PDF (231K) -
Tadahiro OHNISHI1971 Volume 8 Issue 12 Pages 717-720
Published: December 25, 1971
Released on J-STAGE: December 19, 2008
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Kanji TASAKA, Kinji KOYAMA, Nobuo SASAMOTO, Motoyoshi TAKEUCHI1971 Volume 8 Issue 12 Pages 720-724
Published: December 25, 1971
Released on J-STAGE: December 19, 2008
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Hitoshi KANNO1971 Volume 8 Issue 12 Pages 725-727
Published: December 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSDownload PDF (189K) -
1971 Volume 8 Issue 12 Pages 727
Published: 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSDownload PDF (35K)
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