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Dissolution of NaK

Description: Abstract: "A rapid yet safe method for the dissolution of sodium-potassium alloys prior to chemical or instrumental analysis has been devised. The alloy is submerged beneath the surface of an inert organic reagent and dissolved at a controlled rate by adding methanol drop-by-drop. A blanket of inert gas is maintained over the reaction flask. The procedure has been successfully used to dissolve samples of NaK in the range of 0.05 to 25 grams."
Date: December 2, 1952
Creator: White, J. C.; Talbott, C. K. & Brady, L. J.
Partner: UNT Libraries Government Documents Department

Subcontract Work by Thompson Products, Inc.

Description: In April, 1954, Thompson Products Inc. formally began work on a program leading to the fabrication of two test radiators. The work done to date is summarized in report number PWAC-127, First Technical Report by Thompson Products Inc. on Liquid-Metal-to-Air Radiators and in PWAC-128, Second Technical Report by Thompson Products Inc. on Liquid-Metal-to-Air Radiators. The first report describes possible radiator design concepts meeting the required specifications and presents an analytical method which was derived to optimize the designs. Thompson Products has decided that a core with cast NaK passages in combination with the sheet-metal, ribbon fins on the airside offers maximum reliability. The second report formulates the analysis of the final radiator design and presents the fabrication and evaluation studies used to select the design. To evaluate the permeability of cast NaK passages, Thompson Products is planning to build a hot NaK flow rig. A parallel investigation on wrought materials will be carried out as an alternate NaK passage type. The next phase of the program, the final design of the test radiator, has started.
Date: April 20, 1955
Creator: Shaw, R.H.
Partner: UNT Libraries Government Documents Department

Performance Characteristics of a Liquid Metal MHD Generator

Description: Report issued by the Argonne National Laboratory discussing the performance of magnetohydrodynamic generators. As stated in the abstract, "an experimental study was made of the performance characteristics of a liquid metal MHD generator utilizing single-phase sodium-potassium and two-phase sodium-potassium-nitrogen fluids. The purpose of this study was to compare the generator performance with theory for single-phase flow and to determine the effects of the introduction of the gaseous phase on the generator output and efficiency" (p. 9). This report includes tables, illustrations, and photographs.
Date: July 1964
Creator: Petrick, Michael & Lee, Kung-You
Partner: UNT Libraries Government Documents Department

Correlation of Cavitation Inception Data for a Centrifugal Pump Operating in Water and in Sodium Potassium Alloy (NaK)

Description: For the centrifugal pump under investigation, the static head at pump suction, in feet absolute, at cavitation inception was correlated for water and for 1500 F NaK on the basis of the differences of the vapor pressures of the two liquids. The difference between the vapor pressure of water and NaK, for the same conditions of pump speed and liquid flow, was added to the water-test cavitation inception value, and this estimate proved to be a good approximation to the experimental value found for cavitation inception with NaK. (auth)
Date: December 11, 1958
Creator: Grindell, A. G.
Partner: UNT Libraries Government Documents Department


Description: Heat transfer and isothermal friction characteristics of the experimental ART fuel-to-NaK heat exchanger have been determined for three degrees of spacer density. The data appear to indicate that for a given heat exchanger pressure drop, the heat transfer cocfficient is almost independent of the spacer density; as the spacer density is decreased, the Reynolds modulus increases to such an extent that the Nusselt modulus does not change significantly. For a given available pressure drop, with decreased spacer density, a larger flow rate exists allowing the same heat removal rate with a lower axial temperature change or a greater heat removal rate with the same axial temperature change. (auth)
Date: October 10, 1956
Creator: Wantland, J.K.
Partner: UNT Libraries Government Documents Department


Description: An analysis was made of the problems of control and measuremeat of specimen temperature and heat generation in a NaK-filled capsule containing a fuel specimen. A specific problem is used in this report to demonstrate the large uncertainties normally encountered even in capsules containing thermocouples. This analysis indicates that an improvement by a factor of more than three (i.e., from an uncertainty of plus or minus 7O F to plus or minus 2O F in the example used) may be obtained by use of a differential- thermocouple heatflow meter and by use of a precision thermocoupleplacement clip. Since the irradiation damage suffered by fuel specimens is sensitive to small changes in temperature and burnup, improvements in precision in irradiation testing are of great importance in fuel studies. If the indicated improvement of precision by a factor of three is actually obtained when capsules of this design are irradiated, the experimenter will be able to draw much more reliable conclusions from a given testing program. (auth)
Date: September 22, 1958
Creator: Stang, J.H.; Goldthwaite, W.H. & Dunnington, B.W.
Partner: UNT Libraries Government Documents Department

Survey of Sodium Pump Technology

Description: A review is presented of the current status of sodium pump development as related to nuclear power applications. A description is given of the design features and performance characteristics of the more important types of sodium and sodium-- potassium alloy (NaK) pumps. Some requirements for sodium pumps for future large liquid metal reactor systems are presented with some preliminary consideration of the potential of various pump types to meet these requirements. (auth)
Date: June 1, 1963
Creator: Nixon, D. R.
Partner: UNT Libraries Government Documents Department

Transverse Pressure Difference Across Staggered and Inclined Spacers in the Art Fuel-to-NaK Heat Exchanger

Description: The ART fuel-to-NaK heat exchanger was modified with six 60 staggered spacers and six 60 inclined spacers alterately placed. Transverse pressure taps were installed across one spacer of each type. The average transverse pressure difference across each instrumented spacer was expressed in terms of the ratio of the transverse pressure difference to the quantity, pu/sup 2//2g,, over the Reynolds modulus range of 3,000 to 8,O00. For the inclined spacer, this term fell between 1.4 and 1.1; for the staggered spacer, the data varied randomly between 0.01 and 0.3 with no definite trend established. The tube bundle friction factor was also determined and fell about 10% below the data previously obtained using vertical spacers. (auth)
Date: June 29, 1956
Creator: Wantland, J. L.
Partner: UNT Libraries Government Documents Department

Rotator phases in narrow-gap semiconductors

Description: Zintl compounds of lead and tin with the heavier alkali metals are semiconductors with surprising and unusual properties in both solid and liquid states. These are ascribed to the formation of tetrahedral complex anions arising from charge transfer and covalent bonding around the polyvalent metal ions. The tetrahedra exhibit both rotational and translational order, leading to a variety of complex dynamical behaviors in both solid and liquid phases. The changes in order have dramatic effects on electrical transport properties.
Date: December 1, 1993
Creator: Price, D. L.; Saboungi, M. L.; Fortner, J.; Richardson, J. W. & Howells, W. S.
Partner: UNT Libraries Government Documents Department

Reorientations in plastic crystal phases of Zintl alloys

Description: Quasielastic neutron scattering measurements on the Zintl alloy NaSn show that the high-temperature solid phase discovered by Hume-Rothery is a plastic crystal characterized by rapid rotations of the Sn{sub 4}{sup (4{minus})} Zintl ions. The reorientations are similar to those previously observed in CsPb but have a markedly different wave vector dependence, indicating a different behaviour of the alkali metal ions.
Date: December 31, 1993
Creator: Saboungi, M. L.; Fortner, J.; Price, D. L. & Howells, W. S.
Partner: UNT Libraries Government Documents Department


Description: Failure, which resulted in the stoppage of fluoride flow in ORNL No. 1, occurred as a NaK to fuel leak in the vicinity of the NaK inlet heater. The reaction of NaK with fuel at this point caused the deposition of nearly pure UF/ sub 3/ around the tubes and, finally, a sufficient increase in the melting point of the fuel to produce solidification. Fluorides throughout the heat exchangers were found to be depleted in uranium and to contain some potassium. Thus it would appear that stoppage of flow occurred after considerable NaK pick-up had taken place. Fluoride attack observed in these heat exchangers, with the exception of the area of failure, agreed substantially with what would be predicted from other dynamic systems. However, in those tubes near the point of failure, attack on the"tension" side of the tubes occurred to depths approximately twice those observed in "unstressed" tubes at comparable temperatures. Mass transferred particles were present in the NaK circuit of ORNL No. 1 to a maximum thickness of 15 mils. Deposit thicknesses varied markedly from header to header. (auth)
Date: July 20, 1956
Creator: DeVan, J H & Crouse, R S
Partner: UNT Libraries Government Documents Department