170 Matching Results

Search Results

Results: 1 - 24 next
open access

Nondestructive evaluation of LWR spent fuel shipping casks

Description: An analysis of nondestructive testing (NDT) methods currently being used to evaluate the integrity of Light Water Reactor (LWR) spent fuel shipping casks is presented. An assessment of anticipated NDT needs related to breeder reactor cask requirements is included. Specific R and D approaches to probable NDT problem areas such as the evaluation of austenitic stainless steel weldments are outlined.
Date: February 1, 1978
Creator: Ballard, D. W.
Partner: UNT Libraries Government Documents Department
open access

Presence of UV-endonuclease sensitive sites in daughter DNA of UV-irradiated mammalian cells. [3H-thymidine tracer]

Description: Asynchronous Chinese hamster cells were irradiated with 10 Jm/sup -2/ uv radiation and 0.25 to 4 hours later pulse-labeled with (/sup 3/H)thymidine. Cells synchronized by shaking off mitotic and G/sub 1/ cells were irradiated in either the G/sub 1/-phase or S-phase of the cell cycle and pulse-labeled with (/sup 3/H)thymidine in the S-phase. After a 12 to 14 hour chase in unlabeled medium, the DNA was extracted, incubated with Micrococcus luteus uv-endonuclease and sedimented in alkaline sucrose… more
Date: February 1, 1978
Creator: D'Ambrosio, S. & Setlow, R.B.
Partner: UNT Libraries Government Documents Department
open access

Preconcentration of plutonium radionuclides from natural waters. [Pu in Eniwetok ground water, lagoon and open ocean waters]

Description: A large volume water sampler using manganese dioxide impregnated cartridges for the in situ separation of plutonium in sea water and ground water was studied. Plutonium concentrations obtained by this technique are compared with a radiochemical coprecipitation method. Consistent results were obtained between the two methods for water samples from the Pacific Ocean and Enewetak lagoon. Different results were noted from samples collected in the Enewetak reef and ground water stations. Using this … more
Date: February 1, 1978
Creator: Wong, K. M.; Nioshkin, V. E. & Jokela, T. A.
Partner: UNT Libraries Government Documents Department
open access

Prediction of electron beam welding spiking tendency

Description: On the basis of measured temperature distributions in electron beam welding cavities it is shown that the vapor pressure force dominates in the lower region and the surface tension in the upper region. The region where these two forces are approximately equal is unstable and the surface tension force causes inward flow of liquid metal which tends to form a projection. For a specific material this projection location was found to depend on cavity depth. By postulating that the formation of liqui… more
Date: February 1, 1978
Creator: Schauer, D. A. & Geidt, W. H.
Partner: UNT Libraries Government Documents Department
open access

Energy-averaged neutron cross sections of fast-reactor structural materials

Description: The status of energy-averaged cross sections of fast-reactor structural materials is outlined with emphasis on U.S. data programs in the neutron-energy range 1-10 MeV. Areas of outstanding accomplishment and significant uncertainty are noted with recommendations for future efforts. Attention is primarily given to the main constituents of stainless steel (e.g., Fe, Ni, and Cr) and, secondarily, to alternate structural materials (e.g., V, Ti, Nb, Mo, Zr). Generally, the mass regions of interest a… more
Date: February 1, 1978
Creator: Smith, A.; McKnight, R. & Smith, D.
Partner: UNT Libraries Government Documents Department
open access

Review of issues relevant to acceptable risk criteria for nuclear waste management

Description: Development of acceptable risk criteria for nuclear waste management requires the translation of publicly determined goals and objectives into definitive issues which, in turn, require resolution. Since these issues are largely of a subjective nature, they cannot be resolved by technological methods. Development of acceptable risk criteria might best be accomplished by application of a systematic methodology for the optimal implementation of subjective values. Multi-attribute decision analysis … more
Date: February 22, 1978
Creator: Cohen, J.J.
Partner: UNT Libraries Government Documents Department
open access

Relationship between swelling and the shear modulus of irradiated metal

Description: In three alloy systems, AISI 316, the Ni-Al binary system, and the Fe-Cr-Ni ternary system, a relationship exists between the shear modulus of the unirradiated alloys and the resultant swelling observed. An alloying addition which reduces the shear modulus will subsequently reduce the irradiation-induced swelling in a solid solution hardened alloy system. The reduction in swelling is thought to be associated with the void nucleation phase of the swelling phenomenon. Thus, relative high temperat… more
Date: February 1, 1979
Creator: Bates, J. F.
Partner: UNT Libraries Government Documents Department
open access

Theory of the temperature dependence of positron bulk lifetimes-implications for vacancy formation enthalpy measurements via positron experiments

Description: Temperature dependent effects, which may have a bearing on determinations of vacancy formation enthalpies in metals by positron annihilation, have been observed in certain metals. These effects have been observed to occur both at temperatures below those at which positron annihilation is most sensitive to equilibrium vacancies and at temperatures well within the vacancy-sensitive region. The effect of thermal lattice displacements on positron lifetimes in metals was investigated to help underst… more
Date: February 1, 1977
Creator: Tam, S.W.; Sinha, S.K. & Siegel, R.W.
Partner: UNT Libraries Government Documents Department
open access

Diffusion welding multifilament superconductive composites

Description: Diffusion welding is shown to be a feasible method for joining composites of niobium-titanium superconductor alloy filaments in a pure copper matrix. Good results were repeatedly obtained using 15/sup 0/ scarf joints welded with externally heated tooling and simple uniaxial compression loading in a conventional hydraulic press. Weld cycles of less than one hour total elapsed time were readily attainable. Through proper closed-die design, it was possible to increase welding pressure sufficiently… more
Date: February 27, 1978
Creator: Witherell, C.E.
Partner: UNT Libraries Government Documents Department
open access

Field determinations of HVdc ozone production rates

Description: The environment near a high voltage direct current (HVdc) transmission line experiences corona effects, including the production of oxidants. Field determination of ozone production rates were made at the Bonneville Power Administration (BPA) HVdc Test Facility, the Dalles, Oregon, in fall and winter 1977. A novel micrometeorological profiling technique was used to identify sources of ozone plumes. The results indicate that even during precipitation the atmospheric ozone concentrations from HVd… more
Date: February 1, 1979
Creator: Droppo, J. G.
Partner: UNT Libraries Government Documents Department
open access

Purex process operation and performance: 1970 thoria campaign

Description: The Hanford Purex Plant has demonstrated suitability for reprocessing irradiated thoria (ThO/sub 2/) target elements on a campaign basis. A 1965 process test and major production campaigns conducted in 1966 and 1970 recovered nitrate solution form products totaling approximately 565 tons of thorium and 820 kilograms of /sup 233/U. The overall recoveries for the 1970 campaign based on reactor input data were 94.9 percent for thorium and 95.2 percent for uranium. The primary function of the Hanfo… more
Date: February 1, 1978
Creator: Walser, R.L.
Partner: UNT Libraries Government Documents Department
open access

Needed research on the terrestrial effects of coal gasification and liquefaction technologies

Description: The Terrestrial Effects panel discussed the needed direction and techniques for future research in the terrestrial effects of new coal conversion technologies. Panel members concurred on the need for changes in emphasis, approach, and even attitude in environmental research. The following are the basic perceptions of the panel: Our goal is to provide for environmentally amenable technologies in coal conversion and product distribution, especially focusing on pollutants entering pathways to man.… more
Date: February 1, 1979
Creator: States, J. B.; Harris, W. F.; Haug, P. T.; Kingsbury, G.; Preston, E.; Risser, P. et al.
Partner: UNT Libraries Government Documents Department
open access

Atmospheric trace element pollutants from coal combustion

Description: In summary, analyses have been obtained for approximately 60 elements for sized flyash particles from two coal-fired steam plants. Evaluation of data from the elemental analyses, including the concentration dependence upon particle size, electron microscopy, ESCA, and mass spectrometry suggests a mechanism for formation of the submicron particles in some coal-fired plants. This mechanism involves bursting of larger particles during gas expansion and production of a very large number of very sma… more
Date: February 1, 1979
Creator: Smith, R. D.; Campbell, J. A. & Felix, W. D.
Partner: UNT Libraries Government Documents Department
open access

Characterization of nuclear waste

Description: Nuclear wastes which are logical candidates for deep geologic disposal include commercial (spent fuel, reprocessing) and defense wastes. It is expected that the 5250 metric tons of spent fuel discharged through the end of 1978 would increase to about 100,000 tons by the end of 2000. The individual characteristics of each waste type (spent fuel, solidified waste, defense wastes) are described in turn. (DLC)
Date: February 14, 1979
Creator: Platt, A. M.
Partner: UNT Libraries Government Documents Department
open access

How the air cleans itself

Description: The various mechanisms for atmospheric recovery are discussed, and means by which these pathways can be treated mathematically to formulate models of air quality and pollutant behavior are described. Many of the essentials of atmospheric recovery processes are outlined. The important problems currently at the forefront of wet- and dry-deposition research are also discussed. (JGB)
Date: February 1, 1979
Creator: Hales, J. M.
Partner: UNT Libraries Government Documents Department
open access

BEAM-SURROUNDING INTERACTIONS AND THE STABILITY OF RELATIVISTIC PARTICLE BEAMS

Description: In accord with recent custom, the organizing committee for this conference has scheduled this review paper on beam instabilities. In view of the various review papers which already exist and the fact that the fundamentals of the subject have even been treated in a textbook, I thought this paper might best be devoted to a limited part of the rather large field of beam instabilities. Thus, I have selected only an aspect of the general subject, but an aspect which has during the last years been ve… more
Date: February 1, 1971
Creator: Sessler, Andrew M.
Partner: UNT Libraries Government Documents Department
open access

Load rating and design criteria for pipe snubbers with extension struts

Description: Snubbing devices are used extensively in nuclear power plant piping to prevent seismic shock forces from causing damaging pipe motions. Most seismic snubbers are designed and load rated by the manufacturer without consideration of attaching structure, unless specifically requested to do so by the purchaser. This paper discusses the additional design constraints imposed by the use of extension struts with the seismic snubbers. The constraints evaluated include load rating reduction as a function… more
Date: February 1, 1979
Creator: Entz, R. D. & Anderson, M. J.
Partner: UNT Libraries Government Documents Department
open access

Secondary emission monitors at the Bevatron-Bevalac

Description: Secondary Emission Monitors (SEM) are used for high intensity, high energy beam fluence monitoring of heavy ions. The improved electronics and autozeroing of background noise has extended the useful factor is capacitive changes between the chamber foils, from acoustic and mechanical vibration. Usable levels are in the 10/sup 4/ particles per pulse range for C/sup 6/ ions. The secondary electron yield is proportional to 1/..beta../sup 2/. This gives an increase in yield of about a factor of 25 f… more
Date: February 1, 1979
Creator: Barale, J. J.; Crebbin, K. C.; Lax, J. W.; Richter, R. M. & Zajec, E.
Partner: UNT Libraries Government Documents Department
open access

Proceedings of the fifteenth DOE nuclear air cleaning conference

Description: Papers presented are grouped under the following topics: noble gas separation, damage control, aerosols, test methods, new air cleaning technology from Europe, open-end, and filtration. A separate abstract was prepared for each paper.
Date: February 1, 1979
Creator: First, M.W. (ed.)
Partner: UNT Libraries Government Documents Department
open access

Reserve seismic capacity determination of a nuclear power plant braced frame with piping

Description: A typical diagonal braced steel frame was developed to determine the amount of reserve capacity that is available beyond elastic design levels. The frame was analyzed first using elastic static and dynamic analyses. The loadings included dead and live load, an equivalent static lateral earthquake load, two response spectra and a suite of eight earthquake time history records. The response spectra used were the Housner and Regulatory Guide 1.60. The time histories represented different site cond… more
Date: February 27, 1979
Creator: Nelson, T.A.
Partner: UNT Libraries Government Documents Department
open access

Proposed orbit and vertical dispersion correction system for PEP

Description: The scheme for minimization of the rms orbit errors in ISR and SPEAR will be used to correct the closed orbit errors in PEP. The effectiveness of this scheme has been studied for some alignment and field errors in the PEP magnets and position monitors. It has been found for orbit correction system in PEP consisting of 48 correctors and 96 monitors, both horizontal and vertical orbits can be kept below 0.5 mm rms values even allowing for a position monitor alignment error of 0.5 mm rms. This met… more
Date: February 1, 1979
Creator: Close, E.; Cornacchia, M.; King, A. & Lee, M. J.
Partner: UNT Libraries Government Documents Department
open access

Survey of Modes and Their Effects in ORMAK, ISX-A, and ISX-B

Description: A comparison of some features of the three tokamaks is given. The ORMAK and ISX-A have ceased operation. The ISX-B has completed a checkout phase with studies of circular, ohmically heated plasmas in which it performed much like ISX-A. Shaped and injection heated plasmas are being studied. Diagnostics for mode structures were the usual Mirnov loops for approx.B/sub theta/ and collimated soft x-ray detectors for the internal fluctuations approx.X. The approx.X measurements on ISX-A, and thus far… more
Date: February 14, 1979
Creator: Dunlap, J. L.; Burris, R. D.; Harris, J. H.; Navarro, A. P. & Pare, V. K.
Partner: UNT Libraries Government Documents Department
open access

Sandia Irradiator for Dried Sewage Solids

Description: Separate abstracts have been prepared for the individual papers presented at the seminar. (TFD)
Date: February 1, 1979
Partner: UNT Libraries Government Documents Department
open access

Hot pressing of EuB/sub 6/

Description: Europium boride pellets with 92% of theoretical density were prepared by hot-pressing. By ball milling the starting powder, hot-pressing temperature could be reduced to 1700/sup 0/C. The lower hot-pressing temperature provided better control over final density and gave a more desirable microstructure.
Date: February 1, 1979
Creator: Hollenberg, G. W. & Beutler, P. S.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen