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Volume 2, Issue 8
Displaying 1-6 of 6 articles from this issue
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Osamu SUGIMOTO1965 Volume 2 Issue 8 Pages 277-284
Published: 1965
Released on J-STAGE: February 28, 2008
JOURNAL FREE ACCESSThe reactivity loss caused by a hole introduced in a reactor is calculated by using the two group perturbation theory based on neutron balance. In this paper it is shown that better agreement with experimental results is obtained by the use of a more reasonable probability function than those of Marti and Schneeberger.
The reactivity loss by the presence of a void is calculated by the same method, and results are obtained for several cases : When void volume is below a certain limit, Δk(z) is independent of and proportional to the void volume; in the limit of small void, Δk(z) is proportional to the square of flux. From these results the mechanism of reactivity loss is discussed. In order to justify the discussion, we have made a comparison of the theoretical results with experiments on JRR-2.View full abstractDownload PDF (484K) -
TheoryToshio KAWAI1965 Volume 2 Issue 8 Pages 285-295
Published: 1965
Released on J-STAGE: February 28, 2008
JOURNAL FREE ACCESSTwo methods, modal expansion and invariant imbedding, can be applied to derive a weak coupling reactor kinetics model. The criteria for weak coupling are examined, and coupling constants obtained. The resulting transfer functions and the inhour equation are compared with ordinary space independent cases.View full abstractDownload PDF (713K) -
Fission Gas Release from Nuclear Fuels during Low Temperature, Low Dose IrradiationYasutaka OSAWA1965 Volume 2 Issue 8 Pages 296-303
Published: 1965
Released on J-STAGE: February 28, 2008
JOURNAL FREE ACCESSThe release behavior of fission gases in U-metal, UO2 and uranium carbides, irradiated at arelatively low temperature (below 100°C) to low dosage, was studied by out-of-pile experiments.
It was found that fission gas (183Xe) released from a specimen by fission fragment recoil is mostlycaptured in the wall of the irradiating capsule or in the capsule support material.
The amount of fission gas released into the void space of the capsule is proportional to thesurface area and to the fuel burn-up, and is controlled by a knock-out release mechanism. Thenumber of U atoms considered to take part in the knock-out mechanism by evaporation or displacement due to the intrusion of a recoil fission fragment, is estimated to be 1.4×105-2.7×105 atoms for U-metal and 5×104-10×104 atoms for UO2 and uranium carbides.View full abstractDownload PDF (575K) -
Keiichi SAITO, Masuhiko OTSUKA1965 Volume 2 Issue 8 Pages 304-314
Published: 1965
Released on J-STAGE: February 28, 2008
JOURNAL FREE ACCESSStatistical fluctuations in neutron and precursor distributions in a reactor are investigated in acontinuous phase space.
The theory is constructed on the basis of Ramakrishnan's product density and of the concept of"detectrons". The basic equations for the product densities of degree 2 are derived and solved.
The space-time correlation function for the outputs of neutron detectors and a generalized formulafor the Feymann-α experiment are obtained.View full abstractDownload PDF (723K) -
Toshifumi MURATA, R. A. WOLSCHRIJN1965 Volume 2 Issue 8 Pages 315-320
Published: 1965
Released on J-STAGE: February 28, 2008
JOURNAL FREE ACCESSThis paper reports on the determination of the radial distribution of fission products (Cs, Sr and Zr) in neutron irradiated UO2 pellets. The first part gives the reuslts obtained by gradual dissolution of a pellet. In the second part the fission products distribution has been determined by micro-sampling along the cross-sectional surface of a UO2 pellet.View full abstractDownload PDF (1601K) -
Kazuo WATARI, Masami IZAWA1965 Volume 2 Issue 8 Pages 321-322
Published: 1965
Released on J-STAGE: February 28, 2008
JOURNAL FREE ACCESSDownload PDF (126K)
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