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Laboratory Development of the Acid Thorex Process for Recovery of Consolidated Edison Thorium Reactor Fuel
The id Thorex process, in which nitric acid is the salting'' agent in the solvent extraction of Th and U from an acid eficient feed with TBP in Amsco, was demonstrated in laboratory equipment for the recovery of synthetic Co solidated Edison Thorium Reactor fuel containing trace fission products. The acid was removed from solution of the declad fuel pellets to produce an acid deficient feed by steam stripping, and the adjusted feed was treated with bisulfite to decrease the extractability of fission products. The Th and U were extracted with 30% TBP in Amsco, and pregnant organic was scrubbed with dilute nitric acid to improve decontamination. Additional acid was added to the extraction section to increase the distribution oefficient of the Th, The Th and U could then be stripped ther simultaneously or separately. No difficulties were ound with either excessive reflux of acid or <0.3%. The co centrated aqueous waste was about 0.2 liter per kilog am of Th processed, about 1/10 of that from the aluminum n trate-salted process. Engineering studies showed that the stage height in the extraction column with the acid Thorex process was 2.1 ft compared with 4 ft with the aluminum-salted Thorex process. …
Date:
May 11, 1962
Creator:
Rainey, R. H. & Moore, J. G.
Object Type:
Report
System:
The UNT Digital Library
Underground muon observations in the Soudan 2 detector
The Soudan 2 nucleon decay detector has recorded data since Summer 1988 using a quarter (dimensions 4 m by 8 m by 5 m high) of the eventual detector. This iron-argon time projection chamber records extensive data on each event and has excellent angular and multi-track resolution. We describe the trigger, the event analysis procedure and the current status of the detector and the underground muon data sample. 1 ref.
Date:
September 11, 1989
Creator:
Allison, W. W. M.; Barr, G. D.; Brooks, C. B.; Cobb, J. H.; Kirby-Gallagher, L. M.; Giles, R. H. et al.
Object Type:
Article
System:
The UNT Digital Library
Environmental monitoring at the Lawrence Livermore National Laboratory. 1981 annual report
This report gives methods and results of the 1981 radiation monitoring program at LLL for both radioactive and non-radioactive contamination from gaseous and liquid effluents. Off-site monitoring includes various radionuclides but especially tritium in the ecosystems. (PSB)
Date:
March 11, 1982
Creator:
Auyong, M.; Griggs, K.S. & Buddemeier, R.W.
Object Type:
Report
System:
The UNT Digital Library
Mechanical model for ductility loss
A mechanical model was constructed to probe into the mechanism of ductility loss. Fracture criterion based on critical localized deformation was undertaken. Two microstructure variables were considered in the model. Namely, the strength ratio of grain boundary affected area to the matrix, ..cap omega.., and the linear fraction, x, of grain boundary affected area. A parametrical study was carried out. The study shows that the ductility is very sensitive to those microstructure parameters. The functional dependence of ductility to temperature as well as strain-rate, suggested by the model, is demonstrated to be consistent with the observation.
Date:
February 11, 1980
Creator:
Hu, W.L.
Object Type:
Article
System:
The UNT Digital Library
Advanced conversion: C-1-B advanced conversion
None
Date:
November 11, 1974
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
RADIATION EFFECTS IN GRAPHITE
A review of radiation effects on graphite is presented. Included are discussions of the general relations of these effects with original structural properties, and details of radioinduced changes. Other discussions are devoted to stored energy, annealing, and future problems in the use of nuclear graphite. Data and illustrations concerning structure and radioinduced changes are included. (J.R.D.)
Date:
May 11, 1962
Creator:
Nightingale, R.E.
Object Type:
Report
System:
The UNT Digital Library
DIRECTIONS FOR THE FABRICATION OF A PROBE FOR THE MEASUREMENT OF PLATE SPACING IN PLATE-TYPE FUEL ELEMENTS
A probe for measurement of the space between fuel plates in high-burnup MTR-type fuel elements by eddycurrent techniques is described/su The sensing section is supported near the end of a flattened stainless steel tube into which a rectangular hole was cut to receive it/su The sensing section consists essentially of two slightly bowed springs, the midsections of which protrude slightly above the upper and lower surfaces of the flattened tube. Each spring- carries a section of a ball bearing as the contact point/su It is these two slightly bowed springs that serve as expanding calipers sensing variations in the spacing between adjacent plates. Essentially the rest of the probe is a long handle to permit probing and a conduit for the electrical leads. A two-wire shielded cable is firmly attached to the unflattened end of the probe and then attached to a modified Wheatstone bridge, from which the output is fed into a chart recorder. (M.C.G.)
Date:
April 11, 1962
Creator:
Dismuke, S.E.
Object Type:
Report
System:
The UNT Digital Library
Dissolution of Zirconium Reactor Fuels in Titanium Equipment
Continuous dissolution of Zircaloy-2 in a titanium dissolver appears practical using as a dissolvent refluxing 3 M HNO/sub 2/-l.2 M HF--0.4 M HBF/sub 4/-0.6 M Cr(III)-0.4 M Cr(VI)--0.46 M Zr. Dissolution and corrosion rates were 10 mg/cm/sub 2/-min and 0.0 mil/mo in short term tests, respectively. A stable product solution containing 0.36 M Zr was obtained after addition of aluminum nitrate to complex fluoride ion. Another reagent investigated for use in continuous dissolution was 16 M HNO/sub 3/-2.6 M F-0.025 M HBF/sub 4/-1.4 M Zr with short term titanium corrosion rates of 0.0 mil/mo. However, Zircaloy-2 dissolution rates were only 3 mg/cm/sup 2/-min in the latter reagent. (auth)
Date:
October 11, 1961
Creator:
Gens, T.A.
Object Type:
Report
System:
The UNT Digital Library
Fracture mechanics evaluation of LOFT lower plenum injection nozzle
An analysis to establish whether or not a leak-before-break concept would apply to the LOFT lower plenum injection nozzle is described. The analysis encompassed the structure from the inlet side of valve V-2170 to the lower plenum nozzle-to-reactor vessel weld on the left side of the emergency core cooling system (ECCS). The defect that was assumed to exist was of such a size that the probability of its being missed by the applicable inspection technique was near zero. The Inconel 600 nozzle forging with an initial assumed defect size of 0.64 cm (0.25 in.) deep would behave as follows: (1) the axially oriented defect would result in leak before rupture (the number of cycles to rupture was 11,000), (2) the circumferentially oriented defect would result in a rupture before leak. The number of cycles to failure would be in excess of 14,000. Based on the conservative assumption that the thermal stresses were membrane stresses as opposed to a bending stress, the following were found. For the Inconel 82 weld metal (thickness of 1.3 cm (0.53 in.)) and AISI 316 SST valve body, with an initial assumed defect of 0.25 cm (0.1 in.), the crack would grow through the thickness in …
Date:
July 11, 1977
Creator:
Nagata, P.K. & Reuter, W.G.
Object Type:
Report
System:
The UNT Digital Library
Underground muons from the direction of Cygnus X-3
We report on 3.2 years live time of underground muon observations taken between 1981 and 1989 using the Soudan 1 proportional tube detector, located at a depth of 1800 m water equivalent. The post-1984 observations are consistent with our earlier data on an excess signal apparently correlated with the Cygnus X-3 orbital period. The signal-to-background ratio in the entire data sample is 1 to 3 percent, depending on phase width. 10 refs., 2 figs., 1 tab.
Date:
September 11, 1989
Creator:
Johns, K.; Marshak, M. L.; Peterson, E. A.; Ruddick, K.; Shupe, M.; Ayres, D. S. et al.
Object Type:
Article
System:
The UNT Digital Library
Energy planning and management in developing countries: thoughts concerning a conceptual framework
The unique characteristics of the energy situation in developing countries imposes a unique set of requirements on analytical techniques used for energy planning. The urgency of the situation requires the rapid development and use of simplified models which make maximum use of available data but which can reflect the international energy context. Those techniques must also be able to deal with central energy/development issues such as energy equity or the energy implication of social equity policies, centralized vs. decentralized development, and urbanization.
Date:
October 11, 1977
Creator:
Nathans, R. & Palmedo, P.F.
Object Type:
Article
System:
The UNT Digital Library
Reaction rate calculations via transmission coefficients
The transmission coefficient of a wavepacket traversing a potential barrier can be determined by steady state calculations carried out in imaginary time instead of by real time dynamical calculations. The general argument is verified for the Eckart barrier potential by a comparison of transmission coefficients calculated from real and imaginary time solutions of the Schroedinger equation. The correspondence demonstrated here allows a formulation for the reaction rate that avoids difficulties due to both rare events and explicitly time dependent calculations. 5 refs., 2 figs.
Date:
July 11, 1985
Creator:
Feit, M. D. & Alder, B. J.
Object Type:
Article
System:
The UNT Digital Library
Final report for hydrologic studies support: INTERCOMP code conversion
Mass and energy balance errors noted in a number of IBM-executed problems are caused by the lack of precision in computing total mass and energy values for a domain. This problem is evident in domains constructed with highly variable mesh sizes during the early time of simulation. The machine round-off was corrected by double-precisioning certain calculations for mass and energy balance. Small differences that exist between the improved INTERCOMP code operating on an IBM machine and the old version on a CDC machine seem unimportant. The noted differences are greatest at an onset of physical system perturbation. These differences diminish rapidly with each succeeding time step. Comparisons with numerical and analytical solutions appear to prove authenticity of code results. Numerical comparisons with the CCC computer code on the Mobile experiment data demonstrate the advantage of using aquifer influence functions in place of an infinitely large mesh. The one-dimensional heat transfer in the overburden and underburden appears sufficiently accurate to describe aquifer heat losses.
Date:
January 11, 1982
Creator:
Ichimura, V.
Object Type:
Report
System:
The UNT Digital Library
Geothermal alteration of sediments in the Salton Sea scientific drill hole: Petrophysical properties and mass changes during alteration: Final report
This report has been divided into two sections. The first deals with the results of the petrophysical measurements, and the second concentrates on the distribution of alteration minerals and textures, and on a series of calculations of geochemical changes that occurred during alteration. 32 refs., 23 figs., 10 tabs.
Date:
December 11, 1987
Creator:
McDowell, S.D.
Object Type:
Report
System:
The UNT Digital Library
Reducing Cost-of-Living Adjustments for Military Retirees and the Bipartisan Budget Act: In Brief
This report discusses the reduction of cost-of-living adjustments (COLAs) for military retirees through the Bipartisan Budget Act (BBA). It includes an overview of the changes, demographics of military retirees, and potential effects of the changes.
Date:
February 11, 2014
Creator:
Belasco, Amy
Object Type:
Report
System:
The UNT Digital Library
Coast Guard Polar Icebreaker Modernization: Background and Issues for Congress
This report provides background information and issues for Congress on the sustainment and modernization of the Coast Guard's polar icebreaker fleet, which performs a variety of missions supporting U.S. interests in polar regions. The report is written in response to the Coast Guard's budget request for a new polar ice breaker (none are currently in operation).
Date:
February 11, 2014
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
Interim Agreement on Iran's Nuclear Program
This report discusses the recent development regarding the negotiations with Iran about its nuclear program. The report provides background information on Iranian nuclear program and debates the November 24 Joint Plan of Action Elements.
Date:
December 11, 2013
Creator:
Katzman, Kenneth & Kerr, Paul K.
Object Type:
Report
System:
The UNT Digital Library
Navy Aegis Ballistic Missile Defense (BMD) Program: Background and Issues for Congress
This report provides background information and issues for Congress on the Aegis ballistic missile defense (BMD) program, which is carried out by the Missile Defense Agency (MDA) and the Navy, and gives Navy Aegis cruisers and destroyers a capability for conducting BMD operations. Congress's decisions on the Aegis BMD program could significantly affect U.S. BMD capabilities and funding requirements, and the BMD-related industrial base.
Date:
September 11, 2013
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
Iran Sanctions
Report that focuses on the United States' relationship with Iran and how the Obama Administration is handling prior administration's economic sanctions against Iran.
Date:
January 11, 2011
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Latin America: Terrorism Issues
Report regarding U.S. attention to terrorism in Latin America, which has intensified in the aftermath of the September 2001 terrorist attacks. The report talks about the 112th Congress's initiatives that have been introduced related to terrorism issues in the Western Hemisphere regarding Mexico, Venezuela, and the activities of Iran and Hezbollah.
Date:
July 11, 2013
Creator:
Sullivan, Mark P. & Beittel, June S.
Object Type:
Report
System:
The UNT Digital Library
Europe's Energy Security: Options and Challenges to Natural Gas Supply Diversification
Report that focuses on potential approaches that Europe might employ to diversify its sources of natural gas supply, Russia's role in Europe's natural gas policies, and key factors that could hinder efforts to develop alternative suppliers of natural gas.
Date:
July 11, 2013
Creator:
Ratner, Michael; Belkin, Paul; Nichol, Jim & Woehrel, Steven
Object Type:
Report
System:
The UNT Digital Library
Cybersecurity: Authoritative Reports and Resources
Report that provides links to selected authoritative resources related to cybersecurity issues, including: legislation, hearings in the 112th Congress, data and statistics, and cybersecurity glossaries.
Date:
September 11, 2012
Creator:
Tehan, Rita
Object Type:
Report
System:
The UNT Digital Library
Automobile and Truck Fuel Economy (CAFE) and Greenhouse Gas Standards
Report that looks at vehicle fuel costs, fuel consumption in the United States, and examines the estimated costs to new vehicles that may arise from the Obama Administration's new passenger vehicle fuel economy and greenhouse gas standards for vehicle model years (MY) 2017-2025.
Date:
September 11, 2012
Creator:
Yacobucci, Brent D.; Canis, Bill & Lattanzio, Richard K.
Object Type:
Report
System:
The UNT Digital Library
DHS Headquarters Consolidation Project: Issues for Congress
This report outlines the policy considerations to be evaluated in deciding whether to continue funding the consolidated Department of Homeland Security (DHS) headquarters, and to explore some of the benefits and consequences of several possible ways forward.
Date:
September 11, 2013
Creator:
Painter, William L.
Object Type:
Report
System:
The UNT Digital Library