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Incorporation of high-level wastes in SYNROC: results from recent process-engineering studies at Lawrence Livermore National Laboratory

Description: In this paper, highlights from recent engineering research and development, in particular, results from fluidized bed calcination studies of SYNROC slurry are summarized. A schematic diagram of the envisioned SYNROC process (at this stage of development) is also presented. It shows the use of a fluidized bed calciner to prepare SYNROC powder that is then fed to a storage hopper. Bellows-type canisters are filled, evacuated, sealed and preheated. The preheated canisters are loaded into a hot iso… more
Date: April 15, 1982
Creator: Campbell, J. H.; Hoenig, C. L.; Ackerman, F. J.; Peters, P. E. & Grens, J. Z.
Partner: UNT Libraries Government Documents Department
open access

Immobilization of high-level defense wastes in SYNROC-D: recent research and development results on process scale-up

Description: SYNROC is a titanate-based ceramic waste form being developed to immobilize high-level nuclear reactor wastes. SYNROC-D is a unique variation of SYNROC designed to contain high-level defense wastes, particularly those in storage at the Savannah River Plant (SRP). We review recent research and development on SYNROC-D processing options and report on work in progress on various unit operations. The overall immobilization process can be divided into three general parts: (1) slurry preparation (for… more
Date: March 15, 1982
Creator: Campbell, J. H.; Rozsa, R. B. & Hoenig, C. L.
Partner: UNT Libraries Government Documents Department
open access

Application of Monte Carlo codes to neutron dosimetry

Description: In neutron dosimetry, calculations enable one to predict the response of a proposed dosimeter before effort is expended to design and fabricate the neutron instrument or dosimeter. The nature of these calculations requires the use of computer programs that implement mathematical models representing the transport of radiation through attenuating media. Numerical, and in some cases analytical, solutions of these models can be obtained by one of several calculational techniques. All of these techn… more
Date: June 15, 1982
Creator: Prevo, C.T.
Partner: UNT Libraries Government Documents Department
open access

Evaluating Alternative Responses to Safeguards Alarms

Description: This paper describes a quantitative approach to help evaluate and respond to safeguards alarms. These alarms may be generated internally by a facility's safeguards systems or externally by individuals claiming to have stolen special nuclear material (SNM). This approach can be used to identify the most likely cause of an alarm - theft, hoax, or error - and to evaluate alternative responses to alarms. Possible responses include conducting investigations, initiating measures to recover stolen SNM… more
Date: April 15, 1982
Creator: Al-Ayat, R. A.; Judd, B. R. & McCord, R. K.
Partner: UNT Libraries Government Documents Department
open access

Current status of fast-neutron-capture calculations

Description: This work is primarily concerned with the calculation of neutron capture cross sections and capture gamma-ray spectra, in the framework of the Hauser-Feshbach statistical model and for neutrons from the resonance region up to several MeV. An argument is made that, for applied purposes such as constructing evaluated cross-section libraries, nonstatistical capture mechanisms may be completely neglected at low energies and adequately approximated at high energies in a simple way. The use of gamma-… more
Date: April 15, 1982
Creator: Gardner, D. G.
Partner: UNT Libraries Government Documents Department
open access

High-explosive-driven delay line pulse generator

Description: The inclusion of a delay line circuit into the design of a high-explosive-driven generator shortens the time constant of the output pulse. After a brief review of generator concepts and previously described pulse-shortening methods, a geometry is presented which incorporates delay line circuit techcniques into a coil generator. The circuit constants are adjusted to match the velocity of the generated electromagnetic wave to the detonation velocity of the high explosive. The proposed generator c… more
Date: November 15, 1982
Creator: Shearer, J.W.
Partner: UNT Libraries Government Documents Department
open access

High-temperature oxidation of ion-implanted tantalum. [At 500 and 1000/sup 0/C]

Description: The oxidation of ion-implanted Ta in two different high temperature regimes has been studied. Oxidations were carried out at 500/sup 0/C in Ar/O/sub 2/ mixtures, where oxide growth is known to follow a parabolic rate law in initial stages, and at 1000/sup 0/C in pure O/sub 2/, where a linear-rate behavior obtains. Implanted species include Al, Ce, Cr, Li, Si and Zr at fluences of the order of 10/sup 17//cm/sup 2/. Oxidized samples were studied using Rutherford backscattering, nuclear reaction a… more
Date: September 15, 1982
Creator: Kaufmann, E. N.; Musket, R. G.; Truhan, J. J.; Grabowski, K. S.; Singer, I. L. & Gossett, C. R.
Partner: UNT Libraries Government Documents Department
open access

Hafnium-implanted nickel studied with TDPAC and RBS/channeling before and after laser-surface melting and thermal annealing

Description: The Hf implanted Ni system has been studied by the time-differential perturbed angular correlation (TDPAC) technique and by Rutherford backscattering (RBS)/channeling. Low fluence implants were thermally annealed in vacuum at increasing temperature in order to study the evolution of substitutional and defect-associated solutes using TDPAC. Both detrapping and precipitation (or segregation) effects have been observed. Higher fluence implants were studied by both TDPAC and RBS/channeling in as-im… more
Date: September 15, 1982
Creator: Kaufmann, E. N.; Buene, L.; McDonald, M. L.; Kotthaus, J.; Freitag, K.; Vianden, R. et al.
Partner: UNT Libraries Government Documents Department
open access

Introduction to the magnet and vacuum systems of an electron storage ring

Description: An accelerator or storage ring complex is a concerted interplay of various functional systems. For the convenience of discussion we can divide it into the following systems: injector, magnet, RF, vacuum, instrumentation and control. In addition, the conventional construction of the building and radiation safety consideration are also needed and finally the beam lines, detector, data acquisition and analysis set-ups for research programs. Dr. L. Teng has given a comprehensive review of the whole… more
Date: August 15, 1982
Creator: Weng, W. T.
Partner: UNT Libraries Government Documents Department
open access

Mechanical-engineering aspects of mirror-fusion technology

Description: The mirror approach to magnetic fusion has evolved from the original simple mirror cell to today's mainline effort: the tandem-mirror machine with thermal barriers. Physics and engineering research is being conducted throughout the world, with major efforts in Japan, the USSR, and the US. At least one facility under construction (MFTF-B) will approach equivalent energy breakeven in physics performance. Significant mechanical engineering development is needed, however, before a demonstration rea… more
Date: July 15, 1982
Creator: Fisher, D. K. & Doggett, J. N.
Partner: UNT Libraries Government Documents Department
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