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Characterization of an Energy Source for Modeling Hypothetical Core Disruptive Accidents in Nuclear Reactors. First Interim Report. [LMFBR]

Description: The expansion characteristics of the detonation products of a high-explosive energy source used to simulate the pressure-volume change relationships for sodium-vapor expansions during hypothetical core disruptive accidents in a Fast Test Reactor were determined experimentally. Rigid cylinder-piston experiments performed at two scales (ratio 1:3) were undertaken to determine a pressure-volume relationship as a function of source mass and expansion environment. Some of these measurements were compared with code calculations for the source.
Date: October 1, 1972
Creator: Cagliostro, D. J. & Florence, A. L.
Partner: UNT Libraries Government Documents Department

Geophysical Measurements of Gold-Bearing Gravels, Nevada County, California

Description: Report issued by the Bureau of Mines over development of geophysical equipment. Methods and instruments used during the studies are presented. This report includes tables, maps, and illustrations.
Date: 1972
Creator: Tibbetts, Benton L. & Scott, James H.
Partner: UNT Libraries Government Documents Department

Pressure Distribution in Irregularly Bounded Reservoirs

Description: Report issued by the Bureau of Mines over petroleum reservoir pressure distribution. As stated in the introduction, "the purpose of this investigation is to provide the petroleum engineer with the computer techniques to determine quickly the pressure distribution in a petroleum reservoir" (p. 1). This report includes tables, and illustrations.
Date: 1972
Creator: Higgins, R. V. & Leighton, A. J.
Partner: UNT Libraries Government Documents Department

Pu, U redistribution in (U,Pu)O/sub 2/ fuels by temperature gradients

Description: A predictive model of the time-dependent evolution of radial Pu/U + Pu gradients in operating nonmolten mixed oxide fuels is being developed. This model is based on preferential evaporation-condensation and vapor transport of metal-bearing species either along cracks and porosity channels within the fuel or inside closed pores migrating up the temperature gradient; equilibrium thermodynamics are applied to calculate the continually changing vapor composition over the hot fuel. Predictions of the model are used in combination with recent in-pile experimental data (from nonmolten mixed oxide fuel pins irradiated in EBR-II from 0.2 to about 11 at. % burnup at varying powers) to delineate the key parameters in radial actinide redistribution. A correlation between fuel stoichiometry (O-to-Pu ratio) and the degree of redistribution (described by an enrichment factor ..gamma../sub Pu/) identified, however, the degree of restructuring of the fuel - as determined by the peak linear power rating, time at this power, and the initial fuel density - also has a strong influence on the final value of ..gamma../sub Pu/. Certain kinetic features of the process and intended modifications to the present model are discussed, and evidence for axial actinide vapor transport in an irradiated annular fuel is also presented.
Date: August 1, 1972
Creator: Adamson, M. G. & Aitken, E. A.
Partner: UNT Libraries Government Documents Department
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