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  • 1970-1974  (8)
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  • 1
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    Benchmark gas core critical experiment. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A critical experiment with spherical symmetry has been conducted on the gas core nuclear reactor concept. The nonspherical perturbations in the experiment were evaluated experimentally and produce corrections to the observed eigenvalue of approximately 1% delta k. The reactor consisted of a low density, central uranium hexafluoride gaseous core, surrounded by an annulus of void or low density hydrocarbon, which in turn was surrounded with a 97-cm-thick heavy water reflector.
    Keywords: NUCLEAR ENGINEERING
    Type: Nuclear Science and Engineering; 47; Jan. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Flowing gas, non-nuclear experiments on the gas core reactor (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Variations in cavity wall and injection configurations of the gas core reactor were aimed at establishing flow patterns that give a maximum of the nuclear criticality eigenvalue. Correlation with the nuclear effect was made using multigroup diffusion theory normalized by previous benchmark critical experiments. Air was used to simulate the hydrogen propellant in the flow tests, and smoked air, argon, or Freon to simulate the central nuclear fuel gas. Tests were run both in the down-firing and upfiring directions. Results showed that acceptable flow patterns with volume fraction for the simulated nuclear fuel gas and high flow rate ratios of propellant to fuel can be obtained. Using a point injector for the fuel, good flow patterns are obtained by directing the outer gas at high velocity long the cavity wall, using louvered injection schemes. Recirculation patterns were needed to stabilize the heavy central gas when different gases are used.
    Keywords: NUCLEAR ENGINEERING
    Type: NASA-CR-121191 , ANCR-1118
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Feasibility study of full-reactor gas core demonstration test (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Separate studies of nuclear criticality, flow patterns, and thermodynamics for the gas core reactor concept have all given positive indications of its feasibility. However, before serious design for a full scale gas core application can be made, feasibility must be shown for operation with full interaction of the nuclear, thermal, and hydraulic effects. A minimum sized, and hence minimum expense, test arrangement is considered for a full gas core configuration. It is shown that the hydrogen coolant scattering effects dominate the nuclear considerations at elevated temperatures. A cavity diameter of somewhat larger than 4 ft (122 cm) will be needed if temperatures high enough to vaporize uranium are to be achieved.
    Keywords: NUCLEAR ENGINEERING
    Type: NASA-CR-121190 , ANCR-1120
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Flowing gas, non-nuclear experiments on the gas core reactor (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Flow tests were conducted on models of the gas core (cavity) reactor. Variations in cavity wall and injection configurations were aimed at establishing flow patterns that give a maximum of the nuclear criticality eigenvalue. Correlation with the nuclear effect was made using multigroup diffusion theory normalized by previous benchmark critical experiments. Air was used to simulate the hydrogen propellant in the flow tests, and smoked air, argon, or freon to simulate the central nuclear fuel gas. All tests were run in the down-firing direction so that gravitational effects simulated the acceleration effect of a rocket. Results show that acceptable flow patterns with high volume fraction for the simulated nuclear fuel gas and high flow rate ratios of propellant to fuel can be obtained. Using a point injector for the fuel, good flow patterns are obtained by directing the outer gas at high velocity along the cavity wall, using louvered or oblique-angle-honeycomb injection schemes.
    Keywords: NUCLEAR ENGINEERING
    Type: NASA-CR-120824 , ANCR-1032
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Gamma heating in reflector heat shield of gas core reactor (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Heating rate measurements made in a mock-up of a BeO heat shield for a gas core nuclear rocket engine yields results nominally a factor of two greater than calculated by two different methods. The disparity is thought to be caused by errors in neutron capture cross sections and gamma spectra from the low cross-section elements, D, O, and Be.
    Keywords: NUCLEAR ENGINEERING
    Type: NASA-CR-120903 , ANCR-1077
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Spherical gas core reactor critical experiment (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Criticality experiments using spherical gas core to provide benchmark results for cold conditions of typical nuclear rocket concept
    Keywords: NUCLEAR ENGINEERING
    Type: NASA-CR-72781 , IN-1443
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Critical experiments on a modular cavity reactor (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Critical mass experiments to establish design calculation standards for modular cavity reactors of gas core nuclear rocket engines
    Keywords: NUCLEAR ENGINEERING
    Type: NASA-CR-72681 , IN-1376
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Flow and criticality in the open cycle gas core. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A series of flowing gas experiments using air, argon, and freon has been conducted in Idaho. The purpose is to study methods of obtaining flow patterns which would create maximum possible system reactivity consistent with an acceptably low uranium to coolant-gas loss ratio. These have been conducted on both ?two-dimensional' and truly three-dimensional spherical configurations of diameters 18 to 42 inches. The larger diameter is that proposed for a minimum cost flowing gas critical experiment, and the size extremes make extrapolations to the large 6 and 8 foot diameter configurations more reliable. Results show that large enough inner gas (fuel) volume fractions can be achieved to attain criticality.
    Keywords: NUCLEAR ENGINEERING
    Type: Symposium on Uranium Plasmas: Research and Applications; Nov 15, 1971 - Nov 17, 1971; Atlanta, GA
    Format: text
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    NASA TECHNICAL REPORTS
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