Browsing by Author "Brittliff, E"

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    Buckling and integral spectrum measurements in U233/BeO sub-critical assemblies
    (Australian Atomic Energy Commission, 1965-11) Brittliff, E; Duerden, P
    The materials buckling of three BeO moderated U233 oxide fuelled systems having BeO/U233 ratios of 6496, 4331, and 3248 have been measured by the exponential method. Relative fission rates of U233, U235, and Pu239 were also measured in the equilibrium spectrum region of the same assemblies. Because of the heterogeneous nature of the assembly, fine structure corrections have been applied. Some calculations using the CRAM Diffusion Code have been included.
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    Buckling and integral spectrum measurements in U235 fuelled sub-critical assemblies moderated by BeO/fertile material mixtures
    (Australian Atomic Energy Commission, 1965-12) McCulloch, DB; Duerden, P; Brittliff, E
    Exponential experiments have been carried out to give the materials buckling of a number of near—homogeneous U235/aluminium alloy fuelled systems having fertile oxides intimately mixed with the BeO moderator. Relative fission rates of U235, U233, and Pu239 were also measured in the equilibrium spectrum region of each assembly. Five assemblies having 5 w/o natural uranium oxide in BeO were investigated for a range of BeO/U235 atomic ratios from 1500: 1 to 5700: 1. A similar range covering four assemblies was examined for 5 w/o thorium oxide in BeO. A comparison of the experimental results with diffusion theory calculations is included.
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    Buckling and integral spectrum measurements in U235/BeO sub-critical assemblies
    (Australian Atomic Energy Commission, 1964-07) Duerden, P; McCulloch, DB; Brittliff, E
    The materials buckling of four BeO moderated U235/aluminium alloy fuelled systems having BeO/U235 ratios of 1465, 2930, 5860, and 8790 have been measured by the exponential method. Relative fission rates of U235, U233, and Pu239 were also measured in the equilibrium spectrum region of the same assemblies. The experiments are described in detail, and the results compared with the predictions of a simple spectrum model (Westcott) pending analysis using more complex calculatlonal models.