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Volume 8, Issue 2
Displaying 1-8 of 8 articles from this issue
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Itsuro KIMURA, Katsuhei KOBAYASHI, Toshikazu SHIBATA1971 Volume 8 Issue 2 Pages 59-69
Published: February 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThe fast neutron spectrum in the core of the Kyoto University Reactor (KUR) was measured by using seven threshold reactions, a 6Li sandwich counter and also nuclear emulsion plates, and the results were compared with theoretical calculations by the Sn method. It was found that the shape of the fast neutron spectrum was approximately the same as that of fission neutrons. Making use of these neutrons with fission-type spectrum, measurements were made of the average cross sections for twelve threshold reactions (46Ti(n, p)46Sc, 47Ti(n, p)47Sc, 48Ti(n, p)48Sc, 28Si(n, p)28Al, 29Si(n, p)29Al, 30Si(n, α)27Mg, 51V(n, α)48Sc, 64Zn(n, p)64Cu, 92Mo(n, p)92mNb, 93Nb(n, 2n)92mNb, 204Pb(n, n')204mPb and 204Pb(n, 2n)203Pb). For the purpose of comparison, the average cross sections for six among these reactions were measured also with neutrons from a fission plate. The results agreed within experimetal error with those obtained for neutrons in the KUR core. A Ge(Li) counter was mainly used for the measurement of γ-rays emitted from induced activities.View full abstractDownload PDF (839K) -
Yoshihiko KANEKO, Fujiyoshi AKINO, Ryosuke KUROKAWA, Kenji KITADATE1971 Volume 8 Issue 2 Pages 70-79
Published: February 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSDiffusion coefficients were measured for an H2O-Al slab lattice (H2O 8mm, Al 8mm) in parallel (D ?? ) and perpendicular (D⊥) directions, applying the pulsed neutron technique. The measured results were compared with those of theoretical calculations based on the collision probability method, taking into account anisotropic scattering, and assuming a source neutron distribution of Maxwellian configuration.
Fairly good agreement between theory and experiment was obtained for D⊥ but a considerable discrepancy, of the order of 19%, resulted for D ?? . The relation between measured and theoretical quantities in a heterogeneous system are also discussed.View full abstractDownload PDF (597K) -
Yasunori YAMAMURA, Tamotsu SEKIYA1971 Volume 8 Issue 2 Pages 80-88
Published: February 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThe neutron slowing down problem in an infinite homogeneous medium is treated within the G. G. approximation through the theory of generalized function** (g. f.). As test function for defining the g. f.'s, the source importance for the slowing down is chosen. In place of the Taylor expansion of the collision term of slowing down equation in the G. G. method we expand the adjoint collision term of the importance equation. Solutions obtained with this method clearly reproduce the Placzek wiggles, which do not appear in corresponding solutions by the orthodox G. G. method using the same order of approximation, and our solutions are in very good agreement with the exact Placzek function.View full abstractDownload PDF (557K) -
Radial Propagation of Sodium Boiling by Thermal ProcessKunio NAGASHIMA, Masaji TEZUKA1971 Volume 8 Issue 2 Pages 89-94
Published: February 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSThe radial propagation of sodium boiling by thermal process in a 1, 500 MWe FBR is analyzed with the BOIP-T code. Since the model used embodies some uncertainty, several modes of molten fuel behavior are considered. The time required for boiling to propagate from one channel to its neighbor is calculated. Even on the most conservative basis, the boiling propagation requires at least 10sec, which indicates that the radial propagation of sodium boiling could bs prevented by a suitable core protection system.View full abstractDownload PDF (383K) -
Kazuo MARUYA, Isao KOMINE1971 Volume 8 Issue 2 Pages 95-105
Published: February 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSA study was made on the preparation of UC pellets from mixed powders of UO2 and graphite in a dry process.
The principal results obtained are as follows:
(1) The conditions of carbothermic reduction were determined.
(2) Pressing and sintering procedures using UC clinkers were studied.
(3) An examination was made on the effects of additives and of differences in carbon content on the densities obtainable on the product pellets.View full abstractDownload PDF (3668K) -
Noboru HOKKYO, Nobuo SHIMEGI, Isao SUMIDA1971 Volume 8 Issue 2 Pages 106-107
Published: February 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSDownload PDF (167K) -
Takaaki MATSUMOTO1971 Volume 8 Issue 2 Pages 107-110
Published: February 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSDownload PDF (317K) -
Kensuke SHIRAISHI1971 Volume 8 Issue 2 Pages 110-112
Published: February 25, 1971
Released on J-STAGE: December 19, 2008
JOURNAL FREE ACCESSDownload PDF (200K)
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