Degree Discipline
Degree Level
Country
States
Decade
Year
Month
Language
318,998 Matching Results
Results open in a new window/tab.
prev
Results:
318,985 - 318,998 of
318,998
Z-Area Saltstone Disposal Facility groundwater monitoring report. First quarter 1995
The three monitoring wells at the Z-Area Saltstone Disposal Facility, ZBG 1, 1A, and 2, are sampled quarterly as part of the Savannah River Site Groundwater Monitoring Program and to comply with conditions of the facility`s Industrial Waste Permit IWP-217, issued by the South Carolina Department of Health and Environmental Control (SCDHEC). During first quarter 1995, samples from wells ZBG 1 and 2 were analyzed for selected inorganic constituents, volatile organic compounds, selected radionuclides, and other constituents. Well ZBG 1A was dry and could not be sampled. None of the wells contained constituents above SCDHEC proposed groundwater monitoring standards, final Primary Drinking Water Standards, or flagging criteria. In previous quarters, wells ZBG 1 and 2 contained slightly elevated levels of tritium, similar to the tritium levels detected before Z Area began radioactive operations.
Date:
June 1, 1995
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Z-Area Saltstone Disposal Facility groundwater monitoring report. Second quarter 1995
The three monitoring wells at the Z-Area Saltstone Disposal Facility, ZBG 1, 1A, and 2, are sampled quarterly as part of the Savannah River Site Groundwater Monitoring Program and to comply with conditions of the facility`s Industrial Waste Permit IWP-217, issued by the South Carolina Department of Health and Environmental Control (SCDHEC). During second quarter 1995, samples from wells ZBG 1 and 2 were analyzed for selected inorganic constituents, volatile organic compounds, selected radionuclides, and other constituents. Well ZBG 1A was dry and could not be sampled. Dichloromethane, a common laboratory contaminant, was detected above final Primary Drinking Water Standards (PDWS) in well ZBG 1 and was detected in this well`s associated method blank during second quarter 1995. No other constituents exceeded final PDWS, SCDHEC proposed groundwater monitoring standards, or Savannah River Site flagging criteria in the ZBG wells during second quarter 1995. In previous quarters, wells ZBG 1 and 2 contained slightly elevated levels of tritium, similar to the tritium levels detected before Z Area began radioactive operations. The Z-Area Saltstone Disposal Facility blends low-level salt solutions with cement, slag, and flyash to form a nonhazardous cementitious waste that is pumped to aboveground disposal vaults.
Date:
September 1, 1995
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zachary-Fort Lauderdale pipeline construction and conversion project: final supplement to final environmental impact statement. Docket No. CP74-192
This Final Supplement to the Final Environmental Impact Statement (Final Supplement) evaluates the economic, engineering, and environmental aspects of newly developed alternatives to an abandonment/conversion project proposed by Florida Gas Transmission Company (Florida Gas). It also updates the staff's previous FEIS and studies revisions to the original proposal. Wherever possible, the staff has adopted portions of its previous FEIS in lieu of reprinting portions of that analysis which require no change. 60 references, 8 figures, 35 tables.
Date:
May 1, 1980
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zero-Power Experiments With Boiling Core B-1, BORAX-V
Results are reported of the zero-power operation of the initial boiling core B-1 from room-temperature, atmosphenlc pressure conditions at 489 deg F and 600 psig. The core characteristics which were measured are critical mass, control rod calibrations, excess reactivity, shutdown reactivity margin, reactivity effects of various core components, reactivity effects of temperature and voids, neutron flux and power distributions, and cadmium ratios. Some development and calibration work was done on a rotating oscillator rod. It was estimated that the rated full power of 20 Mw(th) probably could not be achieved, and therefore core changes were started for core B-2, designed to achieve more available excess reactivity. (D.L.C.)
Date:
June 1, 1963
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zimmer slipstream magnesium hydroxide recovery demonstration. Volume I of II. Final report, April 1, 1993--May 31, 1995
Dravo Lime has for many years supplied magnesium containing lime in the ranges of 3-6% MgO. Several years ago Dravo Lime realized the potential operating savings its FGD customers could benefit from if magnesium could be recovered from FGD waste streams. As a result, several different proprietary processes have been developed for the recovery of magnesium hydroxide. These recovery processes include steps for magnesium hydroxide separation, purification, and crystal growth. The process implemented at The Cincinnati Gas Electric Company`s Wm. H. Zimmer Station was piloted by Dravo Lime Company at Allegheny Power System`s Mitchell Station near Monongahela, PA during the fourth quarter in 1989 and first quarter in 1990. This pilot work was the foundation for further development of the ThioClear process at Dravo`s pilot plant at CG&E Miami Fort Station. The ThioClear process is a closed loop version of the magnesium hydroxide recovery process with the same unit operations and products but also including an absorber tower for scrubbing flue gas. Testing at Miami Fort of the ThioClear process led to improvements in separation of magnesium hydroxide from gypsum that are part of the magnesium hydroxide recovery process installed at Zimmer Station.
Date:
March 1, 1998
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zimmer slipstream magnesium hydroxide recovery demonstration. Volume II of II. Appendices
Dravo Lime has for many years supplied magnesium containing lime in the ranges of 3-6% MgO. Several years ago Dravo Lime realized the potential operating savings its FGD customers could benefit from if magnesium could be recovered from FGD waste streams. As a result, several different proprietary processes have been developed for the recovery of magnesium hydroxide. These recovery processes include steps for magnesium hydroxide separation, purification, and crystal growth. The process implemented at The Cincinnati Gas Electric Company`s Wm. H. Zimmer Station was piloted by Dravo Lime Company at Allegheny Power System`s Mitchell Station near Monongahela, PA during the fourth quarter in 1989 and first quarter in 1990. This pilot work was the foundation for further development of the ThioClear process at Dravo`s pilot plant at CG&E Miami Fort Station. The ThioClear process is a closed loop version of the magnesium hydroxide recovery process with the same unit operations and products but also including an absorber tower for scrubbing flue gas. Testing at Miami Fort of the ThioClear process led to improvements in separation of magnesium hydroxide from gypsum that are part of the magnesium hydroxide recovery process installed at Zimmer Station. This document contains the Appendices for this …
Date:
March 1, 1998
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zirconia-foil compatibility test. Phase I. [Thermal insulation for Brayton isotope power system (BIPS)]
The objective of the tests was to characterize the compatibility of zirconia powder with candidate foil materials for application to the Brayton Isotope Power System (BIPS). Recent MULTI-FOIL meltdown experiments and compatibility tests indicate that the current foil material choices for the BIPS should be reconsidered. Specifically, the items of concern are: (1) higher than anticipated rate of nickel vaporization, (2) compatibility of the zirconia coating with nickel above 600/sup 0/C, and (3) compatibility of the zirconia coating with columbium at temperatures up to 950/sup 0/C. Chemical interaction between the zirconia coating and the substrate foil would degrade the insulation characteristics of the MULTI-FOIL. The tests investigated the compatibilities of zirconia coatings with nickel, niobium, molybdenum and oxidized nickel foils. The data from these compatibility tests provide additional information for system modification.
Date:
October 1, 1976
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zirconium Fire and Explosion Hazard Evaluation. Interim Report
None
Date:
August 1, 1956
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zirconium Highlights
The testing of Zircaloy at various stages of processing by ultrasonic techniques is described A study was made to determine the feasibility of substituting ammonium bifluorlde for the liquid hydrofluoric acid generally used in the etching processes required for the fabrication of Zircaloy fuel coniponents The addition of B to Zr results in a very strong alloy however. they show little proniise for being ductile. Zirconium-boron alloys can be hot forged Boron is very detrimental to the oxidation behavior of Zircaloy-2. (W.L.H.)
Date:
January 1, 1960
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zirconium Highlights
The effect of hot-worked thickness on the corrosion behavior of atmosphere-melted Zircaloy-2 is discussed. Hydrogen pickup upon etching Zircaloy- 2 Zircaloy-3, and properties of vacuum-cast Zircaloy-2 and the fabrication of special Zirccaloy shapes are presented. A hardness converison chart for annealed zirconium and zirconium alloys is included. (J.E.D.) The useful properties of the tungsten wires used in the incandescent lamp and ra dio tubes industry are ensured by adding about 1% of various ingredie (e.g., K, Na, Al, Si compounds) to the tungstic acid and producing metal powder and compressed rods. During the sintering of these rods, the additions are evapo rated to such an extact that finally the concentration of foreign atoms remains only 10/sup 5/. According to the investigations, the warm hardness values of these tungsten pieces is determined by the traces of impurities. In order to investigate the influencce of the various kinds of atoms, an apparatus was built for the determination of half-micro warm hardnesses of various kinds of tungsten metals in the temperature interval 20 to 800 deg C The tungsten wires made with additions containing Si had an average hardness H/sub V/ = 250 at 800 deg C, while the wires without such additions …
Date:
August 1, 1958
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zirconium Hydride Reactor Technology Program. Progress report, April-June 1976
None
Date:
July 21, 1976
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zn/sub 3/P/sub 2/ as an improved semiconductor for photovoltaic solar cells. Ninth quarterly report, September 1, 1980-November 31, 1980
Frequency and voltage dependent capacitance measurements of ZnO/Zn/sub 3/P/sub 2/ heterojunctions have been made and the results interpreted according to a model which considers the total capacitance arising from contributions due to the depletion layer capacitance, interface charges and a dipole charge. The capacitance of the devices is anomalously high at low frequencies but agrees well with the value calculated from the bulk carrier density at 1 MHz. The data suggest a significant contribution to the capacitance from the charging and discharging of interface states. Direct evidence for a relationship between defects in the Zn/sub 3/P/sub 2/ (grains boundaries, dislocations, etc.,) and the collected current have been found by comparing EBIC images of ZnO/Zn/sub 3/P/sub 2/ devices with the etched surfaces of the samples. The series resistance of thin film Zn/sub 3/P/sub 2/ devices has been analyzed and the origin of the series resistance considered. A new substrate consisting of sequentially deposited layers of Fe and Si on mica has resulted in improved device performance. Devices with a conversion efficiency as high as 2.7% have been obtained. Fill factors in excess of 50% have been obtained for the first time. The diffusion coefficient of magnesium has been measured to 100/sup …
Date:
January 1, 1980
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zone refining of plutonium metal
The purpose of this study was to investigate zone refining techniques for the purification of plutonium metal. The redistribution of 10 impurity elements from zone melting was examined. Four tantalum boats were loaded with plutonium impurity alloy, placed in a vacuum furnace, heated to 700{degrees}C, and held at temperature for one hour. Ten passes were made with each boat. Metallographic and chemical analyses performed on the plutonium rods showed that, after 10 passes, moderate movement of certain elements were achieved. Molten zone speeds of 1 or 2 inches per hour had no effect on impurity element movement. Likewise, the application of constant or variable power had no effect on impurity movement. The study implies that development of a zone refining process to purify plutonium is feasible. Development of a process will be hampered by two factors: (1) the effect on impurity element redistribution of the oxide layer formed on the exposed surface of the material is not understood, and (2) the tantalum container material is not inert in the presence of plutonium. Cold boat studies are planned, with higher temperature and vacuum levels, to determine the effect on these factors. 5 refs., 1 tab., 5 figs.
Date:
May 1, 1997
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
ZrH-reactor-technology program. Progress report, April-June 1974
The report on the 2 kW(e) reactor-organic Rankine system was drafted. This report details the design parameters of a minimum weight, 2 kW(e) reactor-organic Rankine system. The system is designed for 5 years unattended life in space. The reactor produces 16.2 kW of thermal power with a NaK outlet temperature of 800/sup 0/F and a 200/sup 0/F ..delta..T. The reactor contains 19 fuel elements, 1.25'' in diameter by 10'' long, hydrided to an N/sub H/ of 6.35. The terrestrial applications effort was oriented towards the establishment of the feasibility of utilizing the zirconium hydride reactor technology in a subsea application for supplying electrical power to deep water, and other environmentally severe, oil well installations. The overall system concept is shown. The power system is composed of three basic modules (i.e., a reactor module, a generator module, and a heat rejection system) mounted on a barge. The barge is then towed to the installation site and submerged to mate with a previously installed seafloor foundation. An assembly/disassembly sequence was drafted detailing the steps required to assemble the reactor module and to disassemble it after 4 years of operations.
Date:
July 12, 1974
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library