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TWO-DIMENSIONAL (r,z) MULTIGROUP CALCULATION FOR AN INTERMEDIATE SPECTRUM CRITICAL ASSEMBLY

Description: The results of two-dimensional (r,z) multigroup calculations of an experimental low-power reactor (PPA19) are described. Comparison is made between calculated results and experimental measurements of reactivity, power distribution, and sodium activation. Generally good agreement is observed between calculation and experiment. This calculation was performed in 1954 and represents the first application of Roe's twodimensional multigroup formulation to the analysis of an operating critical assembl… more
Date: April 14, 1957
Creator: Hofmann, P.L. & Storm, M.L.
Item Type: Refine your search to only Report
open access

Power Transfer Functions of the EBWR Obtained Using a Sinusoidal Reactivity Driving Function

Description: A series of reactor frequency response measurements, relating flux or power level to a reactivity input function, were made to evaluate reactor stability for different values of power parameters. These parameters included: power level, steam pressure, and control rod position. The results were extrapolated to predict EBWR stability at higher operating powers. The experimental data may also be used to evaluate the thermodynamic and hydraulic constants. (authl
Date: January 1, 1958
Creator: DeShong, J.A. Jr.
Item Type: Refine your search to only Report
open access

Fission and Corrosion Product Activities in Main Coolant and Atmosphere of the Vapor Container

Description: Fission products, which may leak from the fuel and activated corrosion products from stainless steel surfaces, influence the design of several systems which support the main coolant system. Since the radioactivity in the main coolant resulting from these impurities must be limited to reasonable levels during operation, a purification system becomes important. Air conditioning of the vapor container as a result of possible main coolant leakage may be necessary during and after operation to remov… more
Date: May 15, 1958
Creator: Kresny, H. S. & Haga, P. B.
Item Type: Refine your search to only Report
open access

Bubble Formation: A Bibliography

Description: Bubble phenomena have been given a new meaning with their study in relation to the kinetic behavior of reactors. Prior to their study in relation to physics, the bulk of work on bubble phenomena concerned naval engineering problems of behavior in cavitation and water entry behavior. This bibliography is intended to fill the need of the reactor physicist as well as the naval engineer. An attempt has been made to include all available references on bubble phenomena and associated effects. A subje… more
Date: June 30, 1958
Creator: Bloomfield, M.; McElroy, W.N. & Skinner, R.E.
Item Type: Refine your search to only Report
open access

The System Zirconium-Iron-Tin. Status Report No. 4 for July 1, 1957- March 31, 1958

Description: A study of the solubility limits of iron and tin in alpha zirconium at temperatares below 500 deg C is in progress. Dilute alloys were prepared by arc- melting using the highest purity materials. Heat treatment of the alloys involves homogenizntion at 800 deg C followed by severe cold work prior to extended anneals at temperatures between 200 and 500 deg C in 50-degree intervals. Metallographic examination of annealed and quenched structures is the primary mode of investigation. Some magnetic s… more
Date: April 24, 1958
Creator: Tanner, L. E.
Item Type: Refine your search to only Report
open access

Transformation Kinetics of Plutonium. Part 2. A Study of the Gamma to Beta to Alpha and Alpha to Beta to Gamma Transformations

Description: The kinetics of the gamma deg C was con- beta deg C was con- alpha , beta deg C was con- gamma , and alpha deg C was con- beta deg C was con- gamma transformations were determined with a fiuid displacement technique. The rates of formation of the alpha and beta phases from the gamma phase were determined after gamma heat treating and allowing a sample to traasform isothermally in the alpha and beta ramges. Isothermal reaction curves were obtained from 160 C to -78C. The time-temperature-transfo… more
Date: July 18, 1958
Creator: Nelson, R. D.
Item Type: Refine your search to only Report
open access

EXPLOSIVE REACTIONS DURING REPROCESSING OF REACTOR FUELS CONTAINING URANIUM AND ZIRCONIUM OR NIOBIUM

Description: Small particles of zirconinm formed during mechancal operations have caused serious industrial explosions. Particles of this type will not be encountered during aqueous chemical reprocessing. However, small panticles of metallic phases rich in zirconium or niobium, produced by selective leaching of a more reactive uranium-rich phase, can enter into violently explosive reactions. The conditions under which explosions with zirconium-bearing alloys may be expected during chemical reprocessing have… more
Date: November 13, 1958
Creator: Gens, T.A.
Item Type: Refine your search to only Report
open access

DEVELOPMENT OF AN EFFICIENT ELUANT FOR REMOVAL OF MOLYBDENUM FROM ANION EXCHANGE RESINS

Description: When acid leach liquors obtained from U ores containing Mo are contacted with anion exchange resin, both U and Mo are adsorbed. The adsorbed Mo is not removed in the norraal U elution process, and when the U-barren resin is recycled, the resin sites already occupied by Mo are unavailable for U adsorption. In succeeding cycles, more and more sites become occupied by Mo, and the resin capacity for U is seriously lowered. This rapid accunmulation of an adsorbed species is known as resin poisoning.… more
Date: August 1, 1956
Creator: Quinlan, K.P. & Barry, R.J.
Item Type: Refine your search to only Report
open access

Tabulation of the Hypergeometric Probability Distribution for Lot Sizes Less Than or Equal to 50

Description: A tabulation (too large to be included in the memorandum) of the hypergeometric probability distribution for lot sizes up to and including 50 is described. Uses of the tabulation in sampling inspection and reliability are described. The tabulation provides a simple way of testing the equality of two proportions when the total number of observations on the proportions does not exceed 50. (auth)
Date: August 13, 1959
Creator: Owen, D B
Item Type: Refine your search to only Report
open access

Neutron-Induced Fission Cross Section of Pu$sup 240$

Description: The fission cross section of Pu/sup 240/ was determimed from Pu/sup 240/U/sup 235/ ratio for neutron energies between threshold and 8.1 Mev. U/sup 235/ cross section values were essentially those given in a recent compilation in ''Progress in Nuclear Energy.'' The technique used was to mount the two foils back-to-back in a double ionization chamber and to irradiate them in a neutron flux of variable energy. (A.C.)
Date: February 1, 1957
Creator: Henkel, R. L.; Nobles, R. A. & Smith, R. K.
Item Type: Refine your search to only Report
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