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SHUT-DOWN COOLING OF ORR

Description: Information is presented that may be used in estimating the magnitude of the shutdown cooling problem in the ORR at various power levels. The information used in the investigation was obtained from other research reactors. (W.L.H.)
Date: August 14, 1959
Creator: Cole, T.E.
Item Type: Refine your search to only Report
open access

Thermodynamic Functions of a Partially Degenerate, Fully Ionized Gas

Description: The formalism of Glassgold, Heckrotte, and Watson for the expansion of the quantum-mechanical grand partition function has been applied to a gas of point charges. The theory was extended to a multicomponent gas of fermions and bosons, and the ring diagrams were summed to give an approximate expression for the equation of state valid for the entire temperature range. The near-classical limit (high-temperature and low-density so that the gas is only slightly degenerate) is discussed in detail, an… more
Date: August 14, 1959
Creator: DeWitt, H.E.
Item Type: Refine your search to only Report
open access

DEVELOPMENT OF METALLIC URANIUM FUEL ELEMENTS OF IMPROVED IRRADIATION STABILITY. Semiannual Progress Report No. 1

Description: The feasibility of improving swelling resistance in metallic uranium by increasing the dislocation density is under investigation. Increasing the density of dislocations is expected to increase the number of sites at which fission product gas atoms are "pinned," increase the number of gas bubble nuclei, and increase mechanical strength. Dislocations are introduced by a treatment which involves deformation of metastable beta or gamma phase in uranium-rich alloys, followed by transformation. Acti… more
Date: December 14, 1959
Item Type: Refine your search to only Report
open access

An Alpha Survey Radiac for Field Use

Description: Abstract: An alpha survey radiac employing a photomultiplier tube and scintillation detector has been developed. The instrument utilizes transistor circuitry and operates from two standard flashlight batteries. Four linear ranges are provided with full scale indication on the highest range corresponding to 10,000 g /m2 Pu2 39. The instrument was designed with .a separable probe and a telescoping extension for easier ground monitoring. A thorium metal source is attached to the instrument housing… more
Date: May 14, 1959
Creator: Sinclair, K. & Kiyoi, G.
Item Type: Refine your search to only Report
open access

Scattering of K<sup>+</sup> Mesons Off Protons

Description: The total K/sup +/-p cross section was measured at the three K/sup +/- meson energies 175 er inch per 25, 225 er inch per 25, and 275 er inch per 25 Mev and the differential scattering cross section was measured at 225 Mev. The K/sup +/-p nuclear force was shown to be repulsive from the observed constructive interference with Coulomb scattering. The differential c=oss section was otherwise isotropic and could arise from either pure S-wave or pure P- wave scattering. Subtracted dispersion relati… more
Date: May 14, 1959
Creator: Kycia, Thaddeus F.
Item Type: Refine your search to only Thesis or Dissertation
open access

THE FAST MULTIPLICATION EFFECT OF BERYLLIUM OXIDE IN REACTORS

Description: The net multiplication effect of beryllium oxide, which is due to the (n,2n) reaction, was calculated using an essentially exact calculation of the neutron spectrum as a function of energy. The upper limit of the (n,2n) cross section curve gives the unpoisoned value epsilon /sup +/ = 1.047 and the lower limit gives epsilon /sup -/ = 1,027. The behavior of the Li/sup 6/poisoned fast multiplication effect as a function of the number of collisions was studied for both beryllium and beryllium oxide… more
Date: December 14, 1959
Creator: Hafele, W. & Tsagaris, M.
Item Type: Refine your search to only Report
open access

Application of a Modified Debye-Huckel Theory to Fully Ionized Gases

Description: The equations of the Debye-Huckel theory, modified to include quantum statistics, are discussed. It is found that the nonlinear equations used by Cowan and Kirkwcod are not unique and that the nonlinear theory can be formulated in different ways to give different answers. The linearized equations of these alternative formulations are discussed, and the correct form of the linearized theory is established. From the linear theory, the Helmholtz free energy of a slightly degenerate plasma is deriv… more
Date: August 14, 1959
Creator: Kidder, R. E. & DeWitt, H. E.
Item Type: Refine your search to only Report
open access

The Pebble Bed Reactor Program. Summary of the First Capsule Irradiation

Description: Various types of uranium --graphite fuel elements were irradiated in the central hole of a 1-Mw swimming pool reactor at a flux of 4 x 10/sup 14/ n/cm/sup 2/-sec. The impregnated graphite sphere samples were prepared with an aqueous uranyl nitrate solution with subsequent baking for conversion to UO/sub 2/. Other types included an admixture of high fired UO/sub 2/ blended with graphite powder and coal tar binder and lumped specimens prepared by mixing a phenolic coke filler with UO/sub 2/ and a… more
Date: January 14, 1959
Item Type: Refine your search to only Report
open access

CHEMISTRY DIVISION ANNUAL PROGRESS REPORT FOR PERIOD ENDING JUNE 20, 1959

Description: The H-F conductance and susceptance were determined for coil-type vessels over a range of frequencies from 2 to 30 mc. The ultraviolet absorption spectra of organic compounds in the vapor phase were determined, and a maximum was assigned to each compound. The dielectric constant values for five alpha substituted ketones at 25 deg C are reponted. A series of acids in dimethylformamide was titrated with the alkali methoxides by the high-frequency and conductance methods. The titration curves by t… more
Date: September 14, 1959
Item Type: Refine your search to only Report
open access

Magnetic Recorder for Nuclear Pulse Application. Period Covered: October 6, 1959 to December 5, 1959

Description: Data on analog magnetic tape charactcristics are presented along with results from conventional and modulator playback system operational tests. Theoretical considerations imply that the modulator head should be loss sensitive to short term variations in record and playback tape speed. It is also pointed out that although a tape recorder operating at 7.5 in./sec has only 12 kcs bandwidth for sinusoidal wave forms. the record and play-back amplifiers for pulse recording can operate with other ba… more
Date: December 14, 1959
Creator: Burgwald, G. M. & Norton, R. M.
Item Type: Refine your search to only Report
open access

Corrosion of Stainless Alloys in High-Temperature Nitrogenous Environments

Description: On the basis of screening tests and favorable mechanical propenties, AISI Type 318 stainless steel was selected as a fuel-element cladding material to operate in c coolant comprised essentially of gaseous nitrogen modified by the addition of oxygen and water vapor. Tests at atmospheric pressure confirmed calculations which indicated that small additions of oxygen to nitrogen would inhibit nitriding by the process of preferential oxidation. The tests at atmospheric pressure determined that the r… more
Date: July 14, 1959
Creator: Keller, D.L. ed.
Item Type: Refine your search to only Report
open access

RAPID TRANSIT--A REACTIVITY SURVEY PROGRAM FOR THE IBM-704

Description: >The program described computes the reactivity changes associated with slurry settling in a one-region cylindrical slurry reactor. Nuclear-data computation has been included in the program in order to avoid tedious hand calculations and to reduce the amount of input data required. About 3000 cases may be processed pcr hour of machine time. Certain modifications to the conventional two-group method and techniques employed in improving the rate of convergence of certain iterative procedures are d… more
Date: April 14, 1959
Creator: Nestor, C. W. Jr.
Item Type: Refine your search to only Report
open access

Studies on Large Area Sub-Fabric Burns: The Effect of an Air Space Between a Two Layer System

Description: It is well known that protection against radiant energy burns afforded by fabrics may be increased by creating an air space between the fabric and the underlying skin. Earlier work in this laboratory has also shown that if one layer of fabric is in contact with skin, protection of a two layer fabric system increases progressively as the space between the fabrics changes from two to five millimeters. With the magnesium source, large area sub-fabric burns were produced to determine the cffects of… more
Date: January 14, 1959
Creator: Berkley, K. M.
Item Type: Refine your search to only Report
open access

Creep Rupture in the Presence of a Fast Neutron Flux

Description: Possible mechanisms for creep rupture during irradiation are examined. Evidence that the rupture occurs by grain boundary sliding alone, or by vacancy condensation, is compared. It is observed that vacancy condensation is the more probable mechanism, and that this mechanism predicts a reduction in creep rupture life for metals exposed to a fast neutron flux (neglecting effects of radiation annealing). (T.F.H.)
Date: January 14, 1959
Creator: Gregory, D. P.
Item Type: Refine your search to only Report
open access

Magnetic Recorder for Nuclear Pulse Application : Covering the Period from October 6, 1959 to December 5, 1959

Description: "Abstract: Data on analog magnetic tape characteristics are presented along with results from conventional and modulator playback system operational tests. Theoretical considerations imply that the modulator head should be loss sensitive to short term variations in record and playback tape speed. It is also pointed out that although a tape recorder operating at 7.5 in./sec has only 12 kcs bandwidth for sinusoidal wave forms. the record and play-back amplifiers for pulse recording can operate wi… more
Date: December 14, 1959
Creator: Burgwald, G. M.
Item Type: Refine your search to only Report
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