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DIMENSIONALLY STABLE ALLOYS. Interim Report

Description: The development of dimensionally stable alloys for high temperature reactor application is discussed. Cold pressing followed by sintering was determined to be the most satisfactory method. Evaluation of alloys by alpha - beta thermal cycling indicated the superiority of U--Mo and U--Nb alloys. A few specimens containing small additions of Mo, Nb, and Si were irradiation tssted in the Materials Testing Reactor. Of these, the Nb alloy (1.6 wt.% Nb) appeared to be most stable. The Mo alloys were somewhat less satisfactory and the alloys containing Si were not stable. (auth)
Date: October 30, 1957
Creator: Eiss, A.L. & Kalish, H.S.
Partner: UNT Libraries Government Documents Department

APPLIED MATHEMATICS DIVISION SUMMARY REPORT FOR JULY 1, 1959 THROUGH JUNE 30, 1960

Description: A summary of each computer program initiated during the report period together with code symbols indicating the extent to which information concerning the program is readily available are given. Programs previously reported are included if changes were made or additional information concerning them was placed in the program library. Abstracts of 704 newsletters and GEORGE bulletins are presented. (For preceding period see ANL-6089.) (W.D.M.)
Date: October 31, 1960
Partner: UNT Libraries Government Documents Department

APPLIED MATHEMATICS DIVISION SUMMARY REPORT, JULY 1, 1962 THROUGH JUNE 30, 1963

Description: Summaries of the computer programs initiated or modified are listed, and the programs developed for the GUS digital computer complex are described. Information included in bulletins or newsletters on computers is indicated, and the new routines for the IBM-704, IBM-1401, and GEORGE are listed. The computer equipment (including GEORGE) presently available for computations is briefly described. An automatic data processing system (CHLOE) was developed for spark chamber photograph analysis. It uses a fiber optics cathode ray tube scanner and an ASI-210 digital computer. (D.C.W.)
Date: October 31, 1964
Partner: UNT Libraries Government Documents Department

SHAPED BURNABLE POISON DEVELOPMENT PROGRAM UNDER THE EURATOM PROGRAM. Quarterly Progress Report, July 1, 1963-September 30, 1963

Description: The number and size of Gd/sub 2/O/sub 3/ poison cylinders were computed for a large boiling water reactor with H/sub 2/O-toUO/sub 2/ ratio of 2.6, a U/ sup 235/ enrichment of 3.3 wt%, and Zr clad. The excess reactivity of the poisoned core was computed for the cold-clean, hot-clean non-voided, and hot full- power condition as a function of Mwd/t. For comparison, these calculations were repeated for B/sub 4/C as the burnable poison element for the same reactor. The use of Gd rather than B/sup 10/ as the burnable poison reduces the moderator and void defect and provides a better match to the poison demand curve. For reactors in the lifetime range of 10,000 Mwd/t, the use of Gd results in a smaller poison residual. However, for lifetimes of approximately 20,000 Mwd/t, B/sup 10/ and Gd are comparable. Methods were developed to account for the netron interaction among clusters of Gd/sub 2/O/sub 3/ poison cylinders. Gadolinia cylinders in Al/ sub 2/O/sub 3/ rods were formed and sintered to 3100 deg F. A reaction between Gd/ sub 2/O/sub 3/ and Al/sub 2/O/sub 3/ begins at 2650 deg F. At 3000 deg F the reaction is complete with the integrity of the cylinders destroyed. The compound GdAlO/sub 3/ is formed. Gadolinia cylinders in UO/sub 2/ rods were formed and sintered to 3100 deg F. A reaction between Gd2O/sub 3/ and UO/sub 2/ begins at 2850 deg F. At 3100 deg F the reaction is complete with the Gd2O/sub 3/ diffused out of its original site and dispersed throughout the UO/sub 2/ matrix. Investigations were begun of the reaction between UO/sub 2/ and Gd2O/sub 3/ mixed with other oxides such as Al2O/sub 3/ in the form of the compound GdAlO/sub 3/. Twenty capsules were loaded with homogeneous mixtures of Al/sub 2/O/sub 3/, B2O/ ...
Date: October 10, 1963
Partner: UNT Libraries Government Documents Department

PHYSICS DIVISION SUMMARY REPORT FOR DECEMBER 1960

Description: The operating principle of the tandem Van de Graaff accelerator is discussed. The use and operation of the 4.5Mev Van de Graaff generator are described. An upper limit was set for the observed mean life of the first excited atate of Ca/sup 43/ and a lower limit was set for the partial mean life for decay by E2 transition from the same state. Groups of delayed neutrons from N/sup 17/ precursors were observed at energies of 1.225 and 0.425 Mev, corresponding to BETA decay to 3/2- atates in Oil in agreement with the shell model. An investigation is reported of the fragmentation of benzene and ethylene with high-energy electrons. The plasma research program is described. The major research described is an experimental study of basic propenties of plasmas produced in homogeneous high-frequency electric fields at low pressure. The doublet splittings in He/sup 5/, N/sup 15/, and Oil (closed shells plus or minus one nucleon) are adequately explained in terms of the combination of the second- order effect due to the tensor force and the firat-order effect due to the L-S potential. (For preceding pericd see ANL-6235.) (W.L.H.)
Date: October 31, 1961
Partner: UNT Libraries Government Documents Department

A PRIMER ON THE ACT-III COMPILER FOR THE LGP-30 DIGITAL COMPUTER

Description: An introduction to the writing of programs for the compiler for the General Precision LGP-30 computer and to the procedures for translating and solving problems with them is presented. Language, operations, methods, and computer operation are covered. (D.C.W.)
Date: October 1, 1963
Creator: Thacher, H.C. Jr. & Grench, R.E.
Partner: UNT Libraries Government Documents Department

LABORATORY INVESTIGATIONS IN SUPPORT OF FLUID BED FLUORIDE VOLATILITY PROCESSES. PART IV. THE FLUID BED FLUORINATION OF U$sub 3$O$sub 8$

Description: In one of the processes under development, the uranium and plutonium content of a spent reactor fuel of the Dresden type would be fluorinated in a fluid-bed reactor to produce the volatile uranium and plutonium hexafluorides. The study of the fluorination of U/sub 3/O/sub 8/ was undertaken because it is the major product obtained in an oxidative decladding step that is being proposed for the removal of uranium and plutonium from stainless steel-clad and Zircaloy- clad fuel elements. The study Will also provide data needed for the development of apparatus and procedures for future work with mixtures of uranosic oxide and plutoniam dioxide. Experiments were performed to determine the optimum reaction conditions for the conversion of U/sub 3/O/sub 8/ to uranium hexafluoride and for minimizing the elutriation of unreacted U/sub 3/O/sub 8/ from the fluid bed. Elutriation of U/sub 3/O/sub 8/ from the fluid bed was minimized when a fluid bed height of 8 in. of 120 mesh alumina, a fluorinating gas phase containing 20 vol% fluorine, and a reaction temperature of 500 deg C were employed. Conversion of greater than 99% of the U/sub 3/O/sub 8/ to uranium hexafluoride was obtained when the feeding-fluorination period, in w,hich the U/sub 3/O/sub 8/ powder was fed into the fluid bed and the major part of the fluorination was accomplished by reacting the oxide with 20 vol % fluorine, was followed by a recycle-fluorination period of 5 hr at 500 deg C with 100% fluorine. Kinetic data for the fluorination of U/sub 3/O/sub 8/, obtained by means of a thermobalance, are reported for the temperature range from 300 to 400 deg C. The data were treated by the diminishing-sphere model. Experimental results are also presented for the oxidative decladding of stainless steelclad and Zircaloy-clad uranium dioxide pellets. (auth)
Date: October 1, 1963
Creator: Jarry, R.L.; Hariharan, A.V.; Manevy, G.; Fischer, J.; Stockbar, J.J.; Riha, J.G. et al.
Partner: UNT Libraries Government Documents Department

Numerical method for studying the circulation patterns of a fluid in a cavity

Description: The method incorporates three circulation-inducing mechanisms: (1) buoyancy induced by nonuniform initial distribution of heat throughout the fluid, (2) buoyancy induced by removal of heat from the fluid, and (3) forced convection induced by withdrawal of heated fluid and return of cooled fluid. A two- dimensional computer program, CIRCO, based on the Marker-and-Cell (MAC) technique, is used to study the circulation patterns. The report discusses the code and illustrates its capabilities by means of examples from studies conducted for the Pacer project, which investigates the concept of producing electrical power from energy released by thermonuclear explosions in a salt dome. Efficient engineering for withdrawing energy from the cavity requires an understanding of the circulation patterns of the heated fluid. CIRCO provides this information in the form of computer-generated plots. (auth)
Date: October 1, 1975
Creator: Stephani, L.M. & Butler, T.D.
Partner: UNT Libraries Government Documents Department

Mineralogical considerations in leaching of primary copper sulfides at elevated temperatures and pressures

Description: The leaching characteristics of four different ores in sulfuric acid systems pressurized with oxygen are described. The variations in the leaching characteristics between different ores can be largely attributed to differences in mineralogy. Certain gangue mineral alteration phases produced during leaching may trap copper from solution, as well as reduce the porosity of the ore. In addition, the formation of secondary copper sulfides, digenite, and covellite may limit the extraction of copper if the supply of oxygen is restricted to chalcopyrite. Apparently, the key consideration for successful leaching is maximizing the rate of oxidation of the sulfides and, at the same time, minimizing the rate of gangue mineral alteration. This can be accomplished at high oxygen pressures and moderate temperatures (70 to 90$sup 0$C) and low pH (less than or equal to 2.0). The ideal ore mineralogy is one that is low in carbonates and easily altered Fe-Mg minerals such as biotite and hornblende, and one that has acceptable pyrite/chalcopyrite ratios. (auth)
Date: October 15, 1975
Creator: Leach, D.L.
Partner: UNT Libraries Government Documents Department

Proposal for a High-Brightness Pulsed Electron Source

Description: We propose a novel scheme for a high-brightness pulsed electron source, which has the potential for many useful applications in electron microscopy, inverse photo-emission, low energy electron scattering experiments, and electron holography. A description of the proposed scheme is presented.
Date: October 16, 2006
Creator: Zolotorev, M.; Commins, E.D.; Heifets, S.; Sannibale, F. & /LBL, Berkeley /UC, Berkeley /SLAC
Partner: UNT Libraries Government Documents Department