Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"Heavy Water"”.
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Measurement of the material buckling of a lattice of slightly enriched uranium rods in heavy water
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1963.
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Design and construction of an automatic neutron flux scanner for the MIT heavy water lattice facility
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1962.
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An evaluation of the net breeding capability of heterogeneously-fuelled pressure-tube heavy water reactors with the thorium fuel cycle
… for an alternative to uranium. The pressure tube heavy water reactor (PT-HWR) has for decades been considered capable of achieving net breeding on the thorium fuel cycle, but this capability has not been conclusively demonstrated. The goal of this work was to perform reactor physics modelling of …
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Investigation of liquid carryover in the girdler-sulfide process for production of heavy water at the AEC Savannah River Plant
… Girdler-Sulfide process for the production of heavy water was carried out using 12 samples of carbon collected over a one-year time period. Organic impurities from the feedwater were concentrated by adsorption on carbon. Studies of methods for the drying of carbon showed that freeze drying …
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Conversion ratios for plutonium recycle in light water reactors: breeding potential in D₂O-H₂O cooled reactors
The conversion properties of close packed, water cooled, plutonium fueled lattices are studied. Lattices with both ordinary water and light-heavy water mixtures are considered. The effects of volume fractions, plutonium concentrations, and heavy water fraction on the neutronics are studied through …
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An x-ray scattering study of surfactant water mixtures
… lamellr mesophases in concentrated surfactant / water mixtures is a well documented phenomenon. This work examines the structure and order of the mesophases exhibited by two sample systems, caesium pentadecafluorooctanoa-te (CsPFO) / heavy water, and decylammonium chloride / ammonium chloride / …
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Thermochemical hydrogen-deuterium isotope effects
… methanol/methanol-d₁, ethanol/ethanol-d₁, and water/heavy water) have been determined as a function of molality in a variety of solvents. The heats for most of the systems could be described as a linear function of average molality with an average deviation in fit of less than one per cent. …
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Evaluation of material attractiveness to non-state actors of various nuclear materials in Thorium fuel cycles
… fuels have been paired with pressure tube heavy water reactors because of their high neutron economy and online refueling capability. However, thorium fuel cycles have raised proliferation concerns regarding the presence of U-233 following the irradiation of fuel bundles. The presence of …
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An economical method for the determination of group constants for reactor lattices
… function is utilized for treating light water moderated systems, and the Honeck amplitude function relates to heavy water moderated systems. The group constants calculated with the economical model have been benchmarked with those computed by the VIM Monte Carlo code. The values obtained …
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Pulsed neutron measurements of the diffusion parameters of heavy and light water mixtures at several temperatures
… 80 and 100 percent D₂O in mixtures of light and heavy water were measured by the pulsed neutron technique at room temperature (21°C), near the freezing point of the mixture in the liquid state, and at -20°C in the solid state (ice). A 250-kv pulsed Cockcroft-Walton accelerator, using neutrons …
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Special isotopes of the FUGEN nuclear reactor
… of interest in decommissioning similarly styled heavy water reactors. This research examines the quantity of the isotopes that are of interest to the decommissioning of both the FUGEN nuclear power plant in Japan and the Pickering nuclear power plant in Canada and makes a comparison between them. …
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Optimization of a GEM-based detector to measure tritium and discriminate against other radiation types
… its fleet of Canadian Deuterium Uranium (CANDU) heavy water reactors. Although it is a less penetrative radionuclide, tritium is shown to have a detrimental effect on the human body when ingested, inhaled or absorbed. GEM detectors have proven to be very useful in the detection of low energy …
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Investigation of a SPH-based sub-cell homogenization for PHWR using a multi-cell model
… that single-cell SPH applied to Pressurized Heavy Water Reactors (PHWR) yields virtually no improvement compared to single-cell standard homogenization. This work attempts to improve those results by accounting for neutron leakage across cell boundaries by performing SPH-based homogenization …
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Improved 3D modelling of CANDU reactors using transport-fitted diffusion coefficients
… behavior of the core in CANDU pressure tube type heavy water reactors with natural-uranium fuel, two levels of calculations are required. Initially, lattice-level transport calculations are carried out to obtain, with high detail and accuracy, the flux distribution inside the lattice cell and …
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Aqueous systems from first-principles : structure, dynamics and electron-transfer reactions
… reaction between ferrous and ferric ions in water is studied in detail. Since the solvent plays an central role in mediating the process, studying electron-transfer reactions requires us to first understand the structure and dynamics of the solvent molecules (water molecules in our case). …
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Lattice Strain and Texture of Plastically Deformed Zircaloy-2 at 77K
… material for the reactor core in both light and heavy water reactors. The intergranular strains and texture greatly affect the mechanical properties of the material while in operation. Understanding the plastic deformation of Zircaloy-2 will improve on current plastic deformation models, …
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Transmutation rates in the annulus gas of pressure tube water reactors
… Pressure Tube (PT) fuel channel design and heavy water as a coolant. Fuel channel annulus gas acts as an insulator to minimize heat losses from the coolant to the moderator. Since fuel bundles are continuously under high neutron fluxes, annulus gas nuclides undergo different nuclear …
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Aging tests for dielectric-coated aluminum to be used in the Sudbury Neutrino Observatory
The Sudbury Neutrino Observatory is a heavy water Cerenkov detector designed to detect solar neutrinos. Its main objective is to confirm or negate the solar neutrino problem. To achieve maximum counting rates and, thus, minimum statistical uncertainties, collection of Cerenkov light must be …
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Structural studies of nonionic lyotropic liquid crystals
… have been studied in binary mixtures with heavy water, using techniques including optical microscopy, nuclear magnetic resonance and x-ray and neutron scattering. The liquid crystalline phases have been characterized and their dimensional parameters determined. A phase diagram of C 16E06 …
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