Author: Atomic Energy of Canada Limited
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Natural-uranium Heavy-water Lattices, Experiment and Theory
Author: Atomic Energy of Canada Limited
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Process Development Pile Measurements of Lattice Parameters of Natural Uranium in Heavy Water
Author: Norman P. Baumann
Publisher:
ISBN:
Category : Heavy water reactors
Languages : en
Pages : 36
Book Description
Publisher:
ISBN:
Category : Heavy water reactors
Languages : en
Pages : 36
Book Description
Theoretical Analysis of Some Heavy Water Natural Uranium Lattices
Author: G. Doherty
Publisher:
ISBN:
Category : Heavy water reactors
Languages : en
Pages : 6
Book Description
Publisher:
ISBN:
Category : Heavy water reactors
Languages : en
Pages : 6
Book Description
Analytical and Experimental Investigations of the Behavior of Thermal Neutrons in Lattices of Uranium Metal Rods in Heavy Water
Author: R. Simms
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 224
Book Description
Measurements of the intracellular distribution of the activation of foils by neutrons were made in lattices of 1/4-inch diameter, 1.03% U-235, uranium rods moderated by heavy water, with bare and cadmium-covered foils of gold, depleted uranium, lutetium, europium and copper. The measurements were made in the M.I.T. Heavy Water Lattice Facility with source neutrons from the M.I.T. Reactor. Two lattices were studied in detail in this work. The more closely packed lattice had a triangular spacing of 1.25 inches, and the less closely packed lattice had a triangular spacing of 2.5 inches. The results of the experiments were compared to one-dimensional, 30-energy group, THERMOS calculations based on the available energy exchange kernels. The comparison indicated that the approximation that the hexagonal cell may be replaced by an equivalent circular cell (the Wigner-Seitz approximation) can lead to serious discrepancies in closely packed lattices moderated by heavy water. A modified one-dimensional, and a two-dimensional, calculation were shown to predict the intracellular activation distribution in the closely packed lattice. An analytical treatment of the problem of the flux perturbation in a foil was developed and compared to the experimental results obtained by using gold foils of four different thicknesses in the lattice cell; the method was shown to be adequate. An analytical method to treat the effect of leakage from an exponential assembly was formulated; the results indicated that only in small exponential assemblies would leakage be a significant problem in intracellular flux measurements. A method was developed to predict the cadmium ratio of the foils used in the lattice cell; comparison with available measurements with gold foils indicated good agreement between theory and experiment, except for a lattice having very large ratios of moderator volume, to fuel volume, e.g., 100:1. Calculations of the fuel disadvantage factor by the method of successive generations for gold, lutetium and europium detector foils were compared to the results of THERMOS calculations, because THERMOS was shown to predict the experimental distributions. The comparison indicated that the method of successive generations is a good alternative to the THERMOS calculation, if all that is required is 17 and the thermal utilization.
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 224
Book Description
Measurements of the intracellular distribution of the activation of foils by neutrons were made in lattices of 1/4-inch diameter, 1.03% U-235, uranium rods moderated by heavy water, with bare and cadmium-covered foils of gold, depleted uranium, lutetium, europium and copper. The measurements were made in the M.I.T. Heavy Water Lattice Facility with source neutrons from the M.I.T. Reactor. Two lattices were studied in detail in this work. The more closely packed lattice had a triangular spacing of 1.25 inches, and the less closely packed lattice had a triangular spacing of 2.5 inches. The results of the experiments were compared to one-dimensional, 30-energy group, THERMOS calculations based on the available energy exchange kernels. The comparison indicated that the approximation that the hexagonal cell may be replaced by an equivalent circular cell (the Wigner-Seitz approximation) can lead to serious discrepancies in closely packed lattices moderated by heavy water. A modified one-dimensional, and a two-dimensional, calculation were shown to predict the intracellular activation distribution in the closely packed lattice. An analytical treatment of the problem of the flux perturbation in a foil was developed and compared to the experimental results obtained by using gold foils of four different thicknesses in the lattice cell; the method was shown to be adequate. An analytical method to treat the effect of leakage from an exponential assembly was formulated; the results indicated that only in small exponential assemblies would leakage be a significant problem in intracellular flux measurements. A method was developed to predict the cadmium ratio of the foils used in the lattice cell; comparison with available measurements with gold foils indicated good agreement between theory and experiment, except for a lattice having very large ratios of moderator volume, to fuel volume, e.g., 100:1. Calculations of the fuel disadvantage factor by the method of successive generations for gold, lutetium and europium detector foils were compared to the results of THERMOS calculations, because THERMOS was shown to predict the experimental distributions. The comparison indicated that the method of successive generations is a good alternative to the THERMOS calculation, if all that is required is 17 and the thermal utilization.
Exponential Experiments with Heavy-water, Graphite-and-diphenyl Moderated, Uranium Metal Lattices
Author: R. W. Campbell
Publisher:
ISBN:
Category : Graphite
Languages : en
Pages : 42
Book Description
Publisher:
ISBN:
Category : Graphite
Languages : en
Pages : 42
Book Description
Heavy Water Exponential Experiments Using ThO2 and UO2
Author: Joseph A. Thie
Publisher:
ISBN:
Category : Heavy water reactors
Languages : en
Pages : 192
Book Description
Publisher:
ISBN:
Category : Heavy water reactors
Languages : en
Pages : 192
Book Description
Heavy Water Lattice Project Annual Report ...
Author:
Publisher:
ISBN:
Category : Heavy water reactors
Languages : en
Pages : 112
Book Description
Publisher:
ISBN:
Category : Heavy water reactors
Languages : en
Pages : 112
Book Description
Efficacy of Experimental Physics Studies on Heavy Water Lattices
Author: John L. Crandall
Publisher:
ISBN:
Category : Heavy water reactors
Languages : en
Pages : 61
Book Description
Publisher:
ISBN:
Category : Heavy water reactors
Languages : en
Pages : 61
Book Description
Neutron Flux Distributions in Natural Uranium Tubes
Author: Thomas B. Ponder
Publisher:
ISBN:
Category : Neutron flux
Languages : en
Pages : 32
Book Description
Publisher:
ISBN:
Category : Neutron flux
Languages : en
Pages : 32
Book Description
Neutron Production Reactor Experiments in the Exponential Assembly
Author: Sidney W. Kash
Publisher:
ISBN:
Category : Deuterium oxide
Languages : en
Pages : 22
Book Description
This report presents results of measurements made in conjunction with the design of a natural heavy water Neutron Production Reactor. The bucklings of eight natural uranium heavy water lattices, including cooling water, air channels and aluminum discs to simulate canning, were experimentally determined. An analysis of the data is also given showing that the measurements are not in consistent with previously developed theories. This report is basedon studies coducted for the Atomic Energy Commission under contract AT-11-1-GEN-8.
Publisher:
ISBN:
Category : Deuterium oxide
Languages : en
Pages : 22
Book Description
This report presents results of measurements made in conjunction with the design of a natural heavy water Neutron Production Reactor. The bucklings of eight natural uranium heavy water lattices, including cooling water, air channels and aluminum discs to simulate canning, were experimentally determined. An analysis of the data is also given showing that the measurements are not in consistent with previously developed theories. This report is basedon studies coducted for the Atomic Energy Commission under contract AT-11-1-GEN-8.