No abstract available

[en] The aims of this study done by the author are: 1) To extend the experimental data for the system, related to that encountered in the recovery of uranium from leach liquors, to include the five components uranium, acid, sulphate, chloride and nitrate ions; 2) To develop a means of quantitatively predicting the general ion exchange equilibrium based on a thermodynamic approach with expressions for the non-idealities evident in both phases; 3) To present the ion exchange characteristics such that they may be included in any future higher order system which has as components the species studied in this work

[en] Examinations of video tapes generated by a remote camera inserted into each of the 10 boreholes through the previously melted zone of the Three Mile Island-2 (TMI) reactor core have contributed greatly to our present knowledge of the end state configuration of damaged material in the core. In order to use the volumes of the damaged zones for fission product mass balance calculations, the uncertainty associated with calculations of those volumes must be known. This report documents the method used for evaluating the uncertainty

[en] The thermal and electrical behaviour of the current buses in the chimney of the D0 solenoid during upset conditions is modeled to guide the selection of trip levels for magnet protection circuits which discharge the magnet if abnormal conditions are detected. The current buses in the chimney are designed to operate safely without likelihood of loss of superconductivity as long as normal cooling conditions are maintained. Helium liquid level probes, helium flow instrumentation, and thermometry all are provided to certify that proper cooling conditions exist in the subcooler and chimney at all times. Rising temperatures in any portion of the system, excessive voltage drops on the vapor cooled leads, or decreasing liquid level in the subcooler or flow rate in the system, will each cause the fast discharge system to be triggered. Postulated failures of the helium flow system, somehow undetected by any and all of the aforementioned instrumentation, can in principal eventually lead to loss of superconductivity in the buses. Quenching in one bus will rapidly lead to quenching in the other. Potential taps on the buses and magnet coil halves connected to voltage-detection bridges external to the system provide at least dually redundant signals which will unambiguously trigger the magnet rapid discharge system. The conservative design of the bus system ensures that it will not be damaged during such incidents, however improbable they may be. The transition leads in the subcooler are equally conservatively designed, and would not be damaged if they were operated in a fully non-superconducting state for several minutes. The loss of liquid helium in the sub cooler required to cause this condition would imply that helium flow from the magnet had stopped, which in turn would imply that flow to the magnet had also stopped. The lack of flow into the sub cooler would result in insufficient flow to the vapor cooled leads. Any or all of these conditions would be detected, as would easily detected spurious voltages on the potential tap system, before damage to the transition leads occurred.

[en] The D0 solenoid was shown to be completely safe when deliberately quenched without a protection resistor in factory trials at Toshiba. In the tests the power supply was turned off shortly after the onset of the quenches. In this note an examination is made of the consequences to be expected if the power supply fails to turn off after the onset of a quench. The quite extreme assumption of simultaneous failure of the magnet power supply to switch off and the dump switch to open in the event of a magnet quench is seen to be completely harmless to the magnet.

[en] Tensile stresses in the Toshiba cold mass support links generated by the loadings the coil is subject to, and the deflections the coil experiences as a result of these loadings, are estimated. The axial links are conservatively designed and it should be reasonably easy to ensure that the three links at each end of the coil carry approximately equal loads. Small deviations from this ideal should not have great consequence as a system-of-three is somewhat forgiving in this regard. The use of preload makes the north operating deflection equal to the smaller south operating deflection, possibly a convenience when the nozzle design is contemplated. Toshiba has indicated they will establish the desired preload using strain gauges near the warm ends of the links.

[en] Low level radiation is now suspected of causing much environmental damage; it is also a phenomenon that can be curbed. Authorities believe that no dose of radiation has a zero risk for causing malignancies. Nuclear power plants are not the only culpritsthe medical profession may be the worst offender. Cosmic radiation on upper stories of skyscrapers, radiation-emitting granite in buildings (such as New York City's Grand Central Station), and non-ionizing radiation from such household appliances as microwave ovens all contribute to low level radiation exposure. Several controversial findings about health hazards from exposure to such radiation have stimulated DOE-sponsored research on the subject

[en] A matched pair of superconducting solenoids and a phase-shifting bridge circuit has been constructed to study energy storage and transfer for application to tokamak EF coils. The intrinsically stable solenoids, each with 4 H self-inductance, incorporate sufficient cooling to allow charging at several hundred volts, corresponding to B = 1 T/sec. The three-phase inductor-convertor capacitive bridge network operating at up to 150 V rms transfers energy reversibly and at controllable rates from the storage coil to the load coil

[en] We have used a core characterization system to measure bulk densities, porosities, and permeabilities of basalt lavas from the vadose zone at the Idaho National Engineering Laboratory (INEL). At the INEL, basalt lava flows with intercalated alluvial, aeolian, and lacustrine sediments extend to depths of one kilometer or more. Individual lava flows are generally less than 15 meters thick and commonly have vesicular tops and bottoms with massive basalt in their interiors. Petrophysical characterization is essential to an understanding of fluid movement in the vadose zone and in the saturated zone. Many hundreds of closely spaced permeability/porosity/bulk density measurements have defined the variability of these parameters within and between individual basalt flows. Based on geological logging and porosity/permeability measurements made on many hundred feet of core, we feel that a rather sophisticated and rigorous logging program is necessary to characterize these complex and highly variable basaltic flow units. This paper endeavors to provide a petrophysical/geological conceptual model of the Snake River Plain basalts from the vadose zone under the Radioactive Waste Management Complex area at the INEL. We hope that this model will aid in subsequent geotechnical logging in this portion of the Eastern Snake River Plain. 8 refs., 14 figs., 2 tabs

[en] The review includes the basic physics of superconductors, conductor stability, cryostatic stability, refrigeration techniques, operating temperature, and high field applications