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in creator/contributor: "Baldwin, C."

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Review of plutonium process chemistry at Rocky Flats

Plutonium metal scrap, oxide, and other residues are processed at Rocky Flats using both pyrochemical and aqueous methods. The pyrochemical processes currently in production include electrorefining, fluorination, hydriding, molten salt extraction (MSE), calcination, and reduction operations. Aqueous processing and waste-treatment methods involve nitric acid dissolution, ion exchange, solvent extraction, and precipitation techniques. An overview of the chemistry involved in these operations will… more

Date: September 1, 1982

Creator: Baldwin, C.E. & Navratil, J.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Pyrochemical coprocessing of UO/sub 2/--PuO/sub 2/ LMFBR fuel by the Salt Transport Method

The pyrochemical coprocessing of spent nuclear fuel by the Salt Transport Process appears to be a potentially viable reprocessing method, not only as an ''exportable proliferation resistant technology,'' but as a domestic reprocessing operation. All operations are nonaqueous and waste generation is in solid form, thus requiring no conversion from aqueous solutions to solids.

Date: January 1, 1979

Creator: Knighton, J.B. & Baldwin, C.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Process technology associated with pyrochemical reprocessing

The process technology of the following three representative processes in pyrochemical reprocessing are examined in detail: melt refining, zinc distillation, and salt transport. (LK)

Date: January 1, 1979

Creator: Baldwin, C.E. & Myles, K.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Fission product retention in TRISCO coated UO sub 2 particle fuels subjected to HTR simulated core heating tests

Results of the examination and analysis of 25,730 individual microspheres from spherical fuel elements HFR-K3/1 and HFR-K3/3 are reported. The parent spheres were irradiated in excess of end-of-life exposure and subsequently subjected to simulated core heating tests in a special high-temperature furnace at Forschungszentrum, Juelich, GmbH (KFA). Following the heating tests, the spheres were electrolytically deconsolidated to obtain unbonded fuel particles for Irradiated Microsphere Gamma Analyz… more

Date: November 1, 1990

Creator: Baldwin, C. A. & Kania, M. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Garo Law

Book about Garo customary law describing customs for marriage, births, deaths, and inheritance.

Date: 1933

Creator: Baldwin, C. D.

Item Type: Book

Partner: UNT College of Information

open access

Recovery studies for plutonium machining oil coolant

Lathe coolant oil, contaminated with plutonium and having a carbon tetrachloride diluent, is generated in plutonium machining areas at Rocky Flats. A research program was initiated to determine the nature of plutonium in this mixture of oil and carbon tetrachloride. Appropriate methods then could be developed to remove the plutonium and to recycle the oil and carbon tetrachloride. Studies showed that the mixtures of spent oil and carbon tetrachloride contained particulate plutonium and plutoniu… more

Date: April 27, 1977

Creator: Navratil, J. D. & Baldwin, C. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Neutron-exposure parameters for the fourth HSST series of metallurgical irradiation capsules

The neutron exposure parameters for the Heavy Section Steel Technology (HSST) Experiments performed at the Oak Ridge National Laboratory (ORNL) can be determined conservatively to +-10% (1sigma) variance. The neutron exposure parameters used for this study were fluence greater than 1 MeV, fluence greater than 0.1 MeV, and displacements per atom (dpa). Measured reaction rates, calculated neutron transport fluxes, and cross sections values were combined in the logarithmic least square adjustment … more

Date: January 1, 1982

Creator: Kam, F. B. K.; Stallmann, F. W.; Baldwin, C. A. & Fabry, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Statistical Modeling of Large-Scale Scientific Simulation Data

With the advent of massively parallel computer systems, scientists are now able to simulate complex phenomena (e.g., explosions of a stars). Such scientific simulations typically generate large-scale data sets over the spatio-temporal space. Unfortunately, the sheer sizes of the generated data sets make efficient exploration of them impossible. Constructing queriable statistical models is an essential step in helping scientists glean new insight from their computer simulations. We define queria… more

Date: November 15, 2003

Creator: Eliassi-Rad, T.; Baldwin, C.; Abdulla, G. & Critchlow, T.

Item Type: Book

Partner: UNT Libraries Government Documents Department

open access

The Evolution of a Hierarchical Partitioning Algorithm for Large-Scale Scientific Data: Three Steps of Increasing Complexity

As scientific data sets grow exponentially in size, the need for scalable algorithms that heuristically partition the data increases. In this paper, we describe the three-step evolution of a hierarchical partitioning algorithm for large-scale spatio-temporal scientific data sets generated by massive simulations. The first version of our algorithm uses a simple top-down partitioning technique, which divides the data by using a four-way bisection of the spatio-temporal space. The shortcomings of … more

Date: April 16, 2003

Creator: Baldwin, C.; Eliassi-Rad, T.; Abdulla, G. & Critchlow, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

IMGA [Irradiated Microsphere Gamma Analyzer] examination of the Set No. 4 fuel under project work statement FD-20

Results of an examination of over 10,800 unbonded fuel particles from three irradiated spherical fuel elements by the Irradiated Microsphere Gamma Analyzer system are reported. The investigation was initiated to assess fission product behavior in LEU UO{sub 2} TRISO-coated fuel particles at elevated temperatures. Of the three spheres considered, one was reserved as a control and the other two were subjected to simulated accident-condition temperatures of 1600{degree}C and 1800{degree}C, respect… more

Date: March 1, 1990

Creator: Baldwin, C. A. & Kania, M. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Literature search for the non-aqueous separation of zinc from fuel rod cladding. [After dissolution in liquid metal]

This report reviews the literature of processes for the nonaqueous separation of zinc from dissolved fuel assembly cladding. The processes considered were distillation, pyrochemical processing, and electrorefining. The last two techniques were only qualitatively surveyed while the first, distillation, was surveyed in detail. A survey of available literature from 1908 through 1978 on the distillation of zinc was performed. The literature search indicated that a zinc recovery rate in excess of 95… more

Date: June 21, 1980

Creator: Sandvig, R. L.; Dyer, S. J.; Lambert, G. A. & Baldwin, C. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Neutron Exposure Parameters for the Dosimetry Capsule in the Heavy-Section Steel Irradiation Program Tenth Irradiation Series

This report describes the computational methodology for the least-squares adjustment of the dosimetry data from the HSSI 10.OD dosimetry capsule with neutronics calculations. It presents exposure rates at each dosimetry location for the neutron fluence greater than 1.0 MeV, fluence greater than 0.1 MeV, and displacements per atom. Exposure parameter distributions are also described in terms of three- dimensional fitting functions. When fitting functions are used it is suggested that an uncertai… more

Date: October 1, 1998

Creator: Baldwin, C. A.; Kam, F. B. K. & Remec, I.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

An overview of the Atlas pulsed-power systems

Atlas is a facility being designed at Los Alamos National Laboratory (LANL) to perform high energy-density experiments in support of weapon-physics and basic-research programs. It is designed to be an international user facility, providing experimental opportunities to researchers from national laboratories and academic institutions. For hydrodynamic experiments, it will be capable of achieving pressures exceeding 20-Mbar in a several cm{sup 3} volume. With the development of a suitable opening… more

Date: December 1, 1997

Creator: Parsons, W.M.; Baldwin, C. & Ballard, E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The DOS 1 neutron dosimetry experiment at the HB-4-A key 7 surveillance site on the HFIR pressure vessel

A comprehensive neutron dosimetry experiment was made at one of the prime surveillance sites at the High Flux Isotope Reactor (HFIR) pressure vessel to aid radiation embrittlement studies of the vessel and to benchmark neutron transport calculations. The thermal neutron flux at the key 7, position 5 site was found, from measurements of radioactivation of four cobalt wires and four silver wires, to be 2.4 {times} 10{sup 12} n{center_dot}m{sup {minus}2}{center_dot}s{sup {minus}1}. The thermal flu… more

Date: January 1, 1994

Creator: Farrell, K.; Kam, F. B. & Baldwin, C. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Gallium-Cladding Compatibility Testing Plan: Phase 3 -- Test Plan for Centrally Heated Surrogate Rodlet Test. Revision 2

The Fissile Materials Disposition Program (FMDP) is investigating the use of weapons grade plutonium in mixed oxide (MOX) fuel for light-water reactors (LWR). Commercial MOX fuel has been successfully used in overseas reactors for many years; however, weapons derived fuel may differ from the previous commercial fuels because of small amounts of gallium impurities. A concern presently exists that the gallium may migrate out of the fuel, react with and weaken the clad, and thereby promote loss of… more

Date: July 1, 1998

Creator: Morris, R. N.; Baldwin, C. A. & Wilson, D. F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Use of Numerical Models as Data Proxies for Approximate Ad-Hoc Query Processing

As datasets grow beyond the gigabyte scale, there is an increasing demand to develop techniques for dealing/interacting with them. To this end, the DataFoundry team at the Lawrence Livermore National Laboratory has developed a software prototype called Approximate Adhoc Query Engine for Simulation Data (AQSim). The goal of AQSim is to provide a framework that allows scientists to interactively perform adhoc queries over terabyte scale datasets using numerical models as proxies for the original … more

Date: May 19, 2003

Creator: Kamimura, R.; Abdulla, G.; Baldwin, C.; Critchlow, T.; Lee, B; Lozares, I. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The Framework for Approximate Queries on Simulation Data

AQSim is a system intended to enable scientists to query and analyze a large volume of scientific simulation data. The system uses the state of the art in approximate query processing techniques to build a novel framework for progressive data analysis. These techniques are used to define a multi-resolution index, where each node contains multiple models of the data. The benefits of these models are two-fold: (1) they are compact representations, reconstructing only the information relevant to t… more

Date: September 27, 2001

Creator: Abdulla, G.; Baldwin, C.; Critchlow, T.; Kamimura, R.; Lee, B.; Musick, R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

HRB-22 irradiation phase test data report

Irradiation capsule HRB-22 was a test capsule containing advanced Japanese fuel for the High Temperature Test Reactor (HTTR). Its function was to obtain fuel performance data at HTTR operating temperatures in an accelerated irradiation environment. The irradiation was performed in the High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory (ORNL). The capsule was irradiated for 88.8 effective full power days in position RB-3B of the removable beryllium (RB) facility. The maximum f… more

Date: March 1, 1995

Creator: Montgomery, F. C.; Acharya, R. T.; Baldwin, C. A.; Rittenhouse, P. L.; Thoms, K. R. & Wallace, R. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Approximate ad-hoc query engine for simulation data

In this paper, we describe AQSim, an ongoing effort to design and implement a system to manage terabytes of scientific simulation data. The goal of this project is to reduce data storage requirements and access times while permitting ad-hoc queries using statistical and mathematical models of the data. In order to facilitate data exchange between models based on different representations, we are evaluating using the ASCI common data model which is comprised of several layers of increasing seman… more

Date: February 1, 2001

Creator: Abdulla, G.; Baldwin, C.; Critchlow, T.; Kamimura, R.; Lozares, I.; Musick, R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Breaking and Moving Hotspots in a Large Grain Nb Cavity with a Laser Beam

Magnetic vortices pinned near the inner surface of SRF Nb cavities are a possible source of RF hotspots, frequently observed by temperature mapping of the cavities outer surface at RF surface magnetic fields of about 100 mT. Theoretically, we expect that the thermal gradient provided by a 10 W green laser shining on the inner cavity surface at the RF hotspot locations can move pinned vortices to different pinning locations. The experimental apparatus to send the beam onto the inner surface of a… more

Date: July 25, 2011

Creator: Ciovati, G.; Cheng, G.; Flood, R. J.; Jordan, K.; Kneisel, P.; Morrone, M. L. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department