Browsing by Author "Wassink, D"

Now showing 1 - 6 of 6
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    Low enrichment Mo-99 target development program at ANSTO
    (Argonne National Laboratory, 2002-11) Donlevy, TM; Anderson, PJ; Storr, GJ; Yeoh, G; Beattie, D; Deura, M; Wassink, D; Braddock, B; Chant, W
    The Australian Nuclear Science and Technology Organisation (ANSTO, formerly AAEC) has been producing fission product Mo-99 in HIFAR, from the irradiation of LEU UO2 targets, for nearly thirty years. Over this period, the U-235 enrichment has been increased in stages, from natural to 1.8% then finally to 2.2%. The decision to provide Australia with a replacement research reactor (RRR) for HIFAR has created an ideal opportunity to review and improve the current Mo-99 production process, right from target design through to chemical processing and waste management. The major focus at this point in time is the development of a LEU target, initially suitable for irradiation in HIFAR and, with subsequent modification, suitable for irradiation in the RRR. We have entered into collaboration with Argonne National Laboratory (RERTR) to develop such a target using uranium metal foil with U-235 enrichment of less than 20%. The first trial irradiation of this target is planned in December 2000 and it will be processed using the current Mo-99 production process at ANSTO. The review of this trial will determine the program for further irradiations.
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    On line neutron flux mapping in fuel coolant channels of a research reactor
    (IEEE, 2014-01-30) Barbot, L; Domergue, C; Villard, JF; Destouches, C; Braoudakis, G; Wassink, D; Sinclair, B; Osborn, JC; Wu, H; Blandin, C; Thévenin, M; Corre, G; Normand, S
    This work deals with the on-line neutron flux mapping of the OPAL research reactor. A specific irradiation device has been set up to investigate fuel coolant channels using subminiature fission chambers to get thermal neutron flux profiles. Experimental results are compared to first neutronic calculations and show good agreement (C/E ~0.97). © 2022 IEEE
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    OPAL Reactor: calculation/experiment comparison of neutron flue mapping in fuel coolant channels
    (International Group On Research Reactors, 2013-10-13) Barbot, L; Domergue, C; Villard, JF; Destouches, C; Braoudakis, G; Wassink, D; Sinclair, B; Osborn, JC; Wu, H
    The measurement and calculation of the neutron flux mapping of the OPAL research reactor are presented. Following an investigation of fuel coolant channels using sub-miniature fission chambers to measure thermal neutron flux profiles, neutronic calculations were performed. Comparison between calculation and measurement shows very good agreement. © The Authors
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    Utilisation of computational fluid dynamics techniques for design of molybdenum target specification
    (International Group On Research Reactors, 2003-03-24) Yeoh, GH; Wassink, D
    A three-dimensional computational fluid dynamics (CFD) model to investigate the hydraulic behaviour within a model of the liner and irradiation rig, located in the central portion of the HIFAR fuel element is described. Flow visualisation and LDV measurements are performed to better understand the fluid flow around the narrow spaces within the irradiation rig, annular target cans and liner. Based on the unstructured meshing consisted of triangular elements and tetrahedrons within the flow space generated for the geometrical structure, the CFD model was able to predict complex flow structures inside the liner containing the irradiation rig and target cans. The reliability of the model was validated against experiments. The predicted flow behaviour was comparable to the experimental observations. Predicted velocities were also found to be in good agreement with LDV measurements. © 2003 The Authors
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    Vibrational characteristics of roll swage jointed plates
    (Australian Acoustical Society, 2010-08-01) Caresta, M; Wassink, D
    The aim of this work is to model the vibrational behaviour of thin plates joined to a stiff orthogonal side plate using the technique of 'roll swaging'. Swage joints are typically found in plate-type fuel assemblies for nuclear reactors. Since they are potentially liable to flow-induced vibrations, it is crucial to be able to predict their dynamic characteristics. It is shown that the contact between the plates resulting from the swage can be modelled assuming a perfect clamp of all the degrees of freedom except for the rotation around the axis parallel to the swage which is elastically restrained with a torsional spring. A modal analysis was performed on different specimens and the values of the first natural frequencies are used to find the equivalent stiffness of the torsional spring restraint by matching these frequencies with the results obtained from a finite element model (FEM). © 2010, Australian Acoustical Society
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    Vibrations of roll swage jointed plates
    (Australian Acoustical Society, 2010-08-23) Caresta, M; Wassink, D
    The aim of this work is to model the vibrational behaviour of thin plates joined to a stiff orthogonal side plate using the technique of ‘roll swaging’. Swage joints are typically found in plate-type fuel assemblies for nuclear reactors. Since they are potentially liable to flow-induced vibrations, it is crucial to be able to predict their dynamic characteristics. It is shown that the contact between the plates resulting from the swage can be modelled assuming a perfect clamp of all the degrees of freedom but the rotational around the axis parallel to the swage. A modal analysis was performed on different specimens and the values of the first natural frequencies are used to find the equivalent torsional spring stiffness, by matching these frequencies with the results obtained from a finite element model (FEM). © Authors