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Arsenic Removal From Gaseous Streams

Description: Uranium feed materials, depending on the production process, have been found to contain arsenic (As) as a contaminant. Analyses show the As to be present as As pentafluoride (AsF{sub 5}) and/or hexafluoroarsenic acid (HAsF{sub 6}) and enter the enrichment cycle through contaminated hydrogen fluoride (HF). Problems related to corrosion of cylinder valves and plugging of feed lines and valves have been attributed to the As. Techniques to separate AsF{sub 5} from uranium hexafluoride (UF{sub 6}) u… more
Date: November 22, 1989
Creator: Russell, R. G. & Otey, M. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Advances in materials science, Metals and Ceramics Division. Triannual progress report, October 1979-January 1980

Description: Progress is summarized concerning magnetic fusion energy materials, laser fusion energy, aluminium-air battery and vehicle, geothermal research, oil-shale research, nuclear waste management, office of basic energy sciences research, and materials research notes. (FS)
Date: March 31, 1980
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Pilot plant processing of sodium bifluoride to sodium fluoride pellets

Description: Sodium fluoride (NaF) traps in the PGDP purge cascade presently use NaF pellets to remove residual UF{sub 6} from the gas stream. These pellets are procured from ORGDP which converts sodium bifluoride pellets to NaF by thermal decomposition. Discussions of the possibility of no longer producing pellets at ORGDP, due to oven corrosion problems, led to a pilot plant test at PGDP. This test was designed to examine the feasibility of producing the NaF pellets at PGDP in the event that an alternativ… more
Date: January 25, 1985
Creator: Leone, S. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Modified Pyroelectric Sodium Fluoride Carrier Distillation Medthod For The Spectrographic Analysis Of Impurities In Plutonium

Description: A modification of the pyroelectric sodium fluoride carrier distillation method for analysis of impurities in plutonium metal is described. The metal is dissolved. Plutonium is precipitated and treated with nitric acid. The slurry obtained is dried and ignited. The resultant low density oxide is mixed with sodium fluoride and pressed into a pellet for arcing. Cobalt is used as the internal standard for densitometric using visual comparisons against prepared standards. The procedural modification… more
Date: August 1, 1966
Creator: Schreiber, G. A. & Barrick, C. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Complex fragment emission in relativistic heavy ion collisions

Description: Data relative to proton and pion production produced in central collisions have been reviewed by S. Nagamiya. Therefore, the production of complex fragments is emphasized here. A presentation is made of experimental data on d, t, /sup 3/He emission and their discussion in terms of the existing models. The size of fireball derived from the analysis of complex fragments is compared to the results of pion interferometry experiment. Interesting features observed in the distribution of charged parti… more
Date: October 1, 1979
Creator: Lemaire, M.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Thermodynamic interpretation of multiparticle emission in relativistic heavy ion collisions

Description: The scattering of the heavy ion Ne from NaF is analyzed at relativistic energy. The spectra of the emission fragments are studied for evidence of a thermodynamic-hydrodynamic collective motion. The spectra of pion, deuteron, and proton emission are fitted for fixed beam and target. The fit is consistent with an interpretation of an expanding hot fluid of interacting nucleons. 2 figures.
Date: February 1, 1980
Creator: Gleeson, A. M. & Raha, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hydrides and Metal-Hydrogen Systems. Final Report

Description: The work reported deals with the preparation and physical properties, especially thermal dissociation pressures, and densities of hydrides, hydrogen- metal systems, and mixtures of hydrides with other substances. Possible applicatlons as moderators, high-temperature neutron shields, and low-temperature shields are cited and design problems discussed. Most of the data on dissociation pressures cover ranges and compounds not hltherto explored because of experimental difficulties and the basic kno… more
Date: April 30, 1951
Creator: Gibb, T. R. P., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Synthesis and evaluation of ultra-pure rare-earth-coped glass for laser refrigeration

Description: Significant progress has been made in synthesizing and characterizing ultra-pure, rare-earth doped ZIBLAN (ZrF{sub 4}-InF{sub 3}BaF{sub 2}-LaF{sub 3}-AlF{sub 3}-NaF) glass capable of laser refrigeration. The glass was produced from fluorides which were purified and subsequently treated with hydrofluoric gas at elevated temperatures to remove impurities before glass formation. Several Yb3 +-doped samples were studied with degrees of purity and composition with successive iterations producing an … more
Date: January 1, 2009
Creator: Patterson, Wendy M; Hehlen, Markus P; Epstein, Richard I & Sheik-bahae, Mansoor
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Subthreshold pion production

Description: This process is relatively well-understood, and one of the aims of subthresold production experiments is to identify other collective effects. Some possible signatures of collective effects are: Production below the 'absolute' threshold; production in excess predictions of nucleon-nucleon models; and a change in the characteristic behavior of the pion spectra as the threshold is crossed. This paper discusses these collective effects especially the last one. (LSP)
Date: November 1, 1987
Creator: Miller, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of a standard bench-scale cell for electrochemical studies on inert anodes. Inert Anode/Cathode Program

Description: Objective of this work was to develop a standard bench-scale cell for performing short-term ac and dc polarization studies on inert anode candidate materials in molten cryolite. Two designs for electrochemical cells were developed and successfully evaluated in short-term experiments. Both cells consisted on the inert anode as a small cylindrical specimen partially sheathed in alumina, an Al/Al/sub 2/O/sub 3/ reference electrode, and a cryolite bath saturated in alumina. The difference between t… more
Date: July 1, 1986
Creator: Windisch, C. F. Jr. & Boget, D. I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Cladding hull decontamination and densification process. Part 1. The prototype cladding hull decontamination system

Description: A prototype system for decontaminating Zircaloy-4 cladding hulls has been assembled and tested at Pacific Northwest Laboratory. The decontamination process consists of treatment with a gaseous mixture of hydrogen fluoride (HF) and argon (Ar) followed by a dilute aqueous etch of ammonium oxalate, ammonium citrate, ammonium fluoride, and hydrogen peroxide. The continuous cleaning process described in this report successfully descaled small portions of most charges, but was unable to handle the or… more
Date: April 1, 1980
Creator: Lambright, T.M. & Montgomery, D.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Novel duplex vapor-electrochemical method for silicon solar cells. Quarterly progress report No. 10, 1 May 1978--31 July 1978

Description: The reactor to produce silicon by the reaction between gaseous SiF/sub 4/ and liquid sodium was scaled up to produce 100 g of silicon per batch. To recover the silicon from the large volume of products of this reaction, the aqueous leaching process was scaled up to treat up to 2-kg batches of reaction product. Rapid leaching was determined to be effective in minimizing loss of silicon due to oxidation. About 95% of the weight of silicon believed to be present in the reaction products was recove… more
Date: January 1, 1978
Creator: Kapur, V.K.; Nanis, L.; Sancier, K.M. & Sanjurjo, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Sorbent selection and design considerations for uranium trapping. [H-151 alumina, XF-100 alumina, F-1 alumina, sodium fluoride]

Description: The efficient removal of UF/sub 6/ from effluent streams can be accomplished through the selection of the best solid sorbent and the implementation of good design principles. Pressure losses, sorbent capacity, reaction kinetics, sorbent regeneration/uranium recovery requirements and the effects of other system components are the performance factors which are summarized. The commonly used uranium trapping materials highlighted are sodium fluoride, H-151 alumina, XF-100 alumina, and F-1 alumina. … more
Date: July 1, 1981
Creator: Schultz, R. M.; Hobbs, W. E.; Norton, J. L. & Stephenson, M. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effects of Hanford high-level waste components on sorption of cobalt, strontium, neptunium, plutonium, and americium on Hanford sediments

Description: To judge the feasibility of continued storage of high-level waste solutions in existing tanks, effects of chemical waste components on the sorption of hazardous radioelements were determined. Experiments identified the effects of 12 Hanford high-level waste-solution components on the sorption of cobalt, strontium, neptunium, plutonium, and americium on 3 Hanford 200 Area sediments. The degree of sorption of strontium, neptunium, plutonium, and americium on two Hanford sediments was then quantif… more
Date: March 1, 1983
Creator: Delegard, C H & Barney, G S
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fourth quarterly report on Silicon halide--alkali metal flames as a source of solar grade silicon, March 1--May 31, 1978

Description: This program is designed to demonstrate the feasibility of using alkali metal-silicon halide diffusion flames in a process for producing large quantities of solar cell grade silicon at low cost. Na + SiCl/sub 4/ flow tube experiments were completed under a variety of conditions of pressure, reactor temperature, and flow velocity. Comparative experiments using 300 K Ar and 1000 K H/sub 2//Ar diluents were performed with few differences in deposition rates or product characteristics found. Silico… more
Date: June 1, 1978
Creator: Olson, D.B. & Miller, W.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Novel duplex vapor-electrochemical method for silicon solar cells. Quarterly progress report No. 9, February 1--April 30, 1978

Description: Economic studies of the SRI process for the production of silicon are described. These studies cover the recovery of SiF/sub 4/ gas from fluosilicic acid (H/sub 2/SiF/sub 6/), sodium reduction of SiF/sub 4/ gas, separation of silicon from the reaction products by leaching the sodium fluorides, conversion of residual fluorides to cryolite, and the environmental treatment of the waste effluents. Since the sodium reduction of SiF/sub 4/ gas is highly exothermic, an attempt was made to understand t… more
Date: April 1, 1978
Creator: Kapur, V.K.; Nanis, L.; Sanjurjo, A. & Barlett, R.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ultraviolet damage resistance of laser coatings

Description: The damage resistance of several thin-film materials used in ultraviolet laser optics was measured at 266 and 355 nm. The coatings included single, quarterwave (QW) layers of NaF, LaF/sub 3/, MgF/sub 2/, ThO/sub 2/, Al/sub 2/O/sub 3/, HfO/sub 2/, ZrO/sub 2/, Y/sub 2/O/sub 3/ and SiO/sub 2/, plus multilayer reflectors composed of some of these materials. The substrates were uv-grade fused silica. Single-shot thresholds were obtained with 22 ns and 27 ns (FWHM) pulses at 266 and 355 nm, respectiv… more
Date: January 1, 1978
Creator: Newnam, B.E. & Gill, D.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Laser damage testing of coated reflectors at excimer laser wavelengths

Description: An important parameter in the design of large-scale ultraviolet lasers (such as those envisioned for Inertial Confinement Fusion and Molecular Laser Isotope Separation) is the resistance to optical damage of windows, AR-coatings, and coated reflectors. In addressing the problem of evaluating and optimizing highly reflective dielectric stacks, we have measured the damage thresholds of a variety of 248-nm, 308-nm, and 351-nm reflectors. The coatings were composed of quarterwave stacks of oxide an… more
Date: January 1, 1981
Creator: Foltyn, S. R. & Newnam, B. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Pretreatment of neutralized cladding removal waste (NCRW) sludge - results of FY 1991 studies

Description: Neutralized cladding removal waste (NCRW) sludge is a unique waste material that is stored in two underground double-shell tanks at the U.S. Department of Energy's Hanford Site. The NCRW sludge was formed by neutralization of the solution resulting from the chemical decladding of Zircaloy-clad metallic uranium fuel by the Zirflex process. The sludge consists of zirconium and sodium hydroxides and fluorides, with small amounts of potassium, nitrite, and other nonradioactive materials. The sludge… more
Date: April 1, 1993
Creator: Lumetta, G.J. & Swanson, J.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ab initio molecular orbital calculations of molten salt vapor complexes using Gaussian-2 theory: LiAlF{sub 4} and NaAlF{sub 4}

Description: The structures and energies of the molten salt vapor complexes LiAlF{sub 4} and NaAlF{sub 4} are studied using new high level ab initio molecular orbital methods. The structures are determined using Moller-Plesset perturbation theory to second-order and the total energies are determined using a recently introduced modification of Gaussian-2 (G2) theory. The total energies are used to determine relative energies of the corner-, edge-, and face-bridged structures and accurate reaction energies. T… more
Date: May 1993
Creator: Curtiss, L. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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