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Effects of water in film boiling over liquid metal melts

Description: Liquid-liquid boiling experiments have been performed with H/sub 2/O and liquid metal melts in the 100-series test matrix (Runs 121, 126, 127) and the VE test matrix. Some of the pre-explosion unstable film boiling data as well as observations from the explosive series have been previously reported.
Date: January 1, 1986
Creator: Greene, G.A.; Finfrock, C. & Burson, S.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Predictive models for thermal hazards. [lowest constant surface temperature at which material of given size and shape will self-heat to catastrophic destruction]

Description: Many self-heating accidents with energetic materials have occurred when operations that have been done safely on a small scale are attempted on a larger scale. They have also occurred when a material is heated for a longer time or to a higher temperature than is normal for its processing or storage, such as might be caused by equipment malfunction or power failure. To prevent self-heating accidents, we must be able to predict the critical temperature for the size and shape of the material we ar… more
Date: January 1, 1986
Creator: Janney, J.L. & Rogers, R.N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Critical study of type II supernovae: equations of state and general relativity

Description: The relevance of relativistic gravitation and of the properties of nuclear matter at high density to supernova explosions is examined in detail. The existing empirical knowledge on the nuclear equation of state at densities greater than saturation, extracted from analysis of heavy ion collisions and from the breathing mode in heavy nuclei, is also considered. Particulars of the prompt explosions recently obtained theoretically by Baron, Cooperstein, and Kahana are presented. 40 refs., 9 figs., … more
Date: January 1, 1986
Creator: Kahana, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Computer simulation of underwater nuclear events

Description: This report describes the computer simulation of two underwater nuclear explosions, Operation Wigwam and a modern hypothetical explosion of greater yield. The computer simulations were done in spherical geometry with the LASNEX computer code. Comparison of the LASNEX calculation with Snay's analytical results and the Wigwam measurements shows that agreement in the shock pressure versus range in water is better than 5%. The results of the calculations are also consistent with the cube root scali… more
Date: September 1, 1986
Creator: Kamegai, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modeling of explosive densensitization by preshocking

Description: Densensitization of heterogeneous explosives by shocks too weak to initiate propagating detonation occurs because the preshock desensitizes the heterogeneous explosive by closing the voids and making it more homogeneous. A higher pressure second shock has a lower temperature in the multiple shocked explosive than in single shocked explosive. The multiple shock temperature may be low enough to cause a detonation wave to fail to propagate through the preshocked explosive. 9 refs., 8figs., 2 tabs.
Date: January 1, 1986
Creator: Mader, C.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Initial concepts on energetics and mass releases during nonnuclear explosive events in fuel cycle facilities

Description: Non-nuclear explosions are one of the initiating events (accidents) considered in the US Nuclear Regulatory Commission study of formal methods for estimating the airborne release of radionuclides from fuel cycle facilities. Methods currently available to estimate the energetics and mass airborne release from the four types of non-nuclear explosive events (fast and slow physical explosions and fast and slow chemical explosions) are reviewed. The likelihood that fast physical explosions will occu… more
Date: September 1, 1986
Creator: Halverson, M.A. & Mishima, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Safety analysis of the existing 851 Firing Facility

Description: A safety analysis was performed to determine if normal operations and/or potential accidents at the 851 Firing Facility at Site 300 could present undue hazards to the general public, personnel at Site 300, or have an adverse effect on the environment. The normal operations and credible accidents that might have an effect on these facilities or have off-site consequences were considered. It was determined by this analysis that all but two of the hazards were either low or of the type or magnitud… more
Date: June 5, 1986
Creator: Odell, B.N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Image-intensifier camera studies of shocked metal surfaces

Description: A high-space-resolution image-intensifier camera with luminance gain of up to 5000 and exposure times as short as 30 ns has been applied to the study of the interaction of posts and welds with strongly shocked metal surfaces, which included super strong steels. The time evolution of a single experiment can be recorded by multiple pulsing of the camera. Phenomena that remain coherent for relatively long durations have been observed. An important feature of the hydrodynamic flow resulting from po… more
Date: January 1, 1986
Creator: Engelke, R.P. & Thurston, R.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Energy and Technology Review

Description: An overview is given of research programs at a two-stage light-gas gun facility. Representative gas-gun experiments are described, and the impact of this research on other LLNL programs and on high-pressure physics work in general are discussed. Particular applications reported include: measurement of equations of state for various materials, synthesis and study of novel materials, and studies of high explosives. Specialized diagnostic techniques for gas-gun experiments are reviewed. (LEW)
Date: March 1, 1986
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Quantification of neptunium by isotope dilution mass spectrometry

Description: A surface ionization-diffusion-type ionization source that uses a rhenium filament overplated with platinum has been developed and optimized for 0.1-ng neptunium samples. This source is capable of measuring the neptunium content of nuclear-test-debris samples to 0.15% precision at the 95% confidence level. 14 refs., 3 figs., 3 tabs.
Date: May 1, 1986
Creator: Efurd, D. W.; Drake, J.; Roensch, F. R.; Cappis, J. H. & Perrin, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Resurrection of neutrinos as dark matter

Description: It is shown that new observations of large scale structure in the universe (voids, foam, and large-scale velocity fields) are best understood if the dominant matter of the universe is in the form of massive (9eV less than or equal to m/sub nu/ less than or equal to 35 eV) neutrinos. Cold dark matter, even with biasing, seems unable to duplicate the combination of these observations (although a fine-tuned loophole with cold matter and percolated explosions may also marginally work.) The previous… more
Date: May 1, 1986
Creator: Schramm, D. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Infrared thermographic study of laser ignition

Description: Pyrotechnic ignition has been studied in the past by making a limited number of discrete temperature-time observations during ignition. Present-day infrared scanning techniques make it possible to record thermal profiles, during ignition, with high spacial and temporal resolution. Data thus obtained can be used with existing theory to characterize pyrotechnic materials and to develop more precise kinetic models of the ignition process. Ignition has been studied theoretically and experimentally … more
Date: July 21, 1986
Creator: Mohler, J.H. & Chow, C.T.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Progress in the theory of fragmentation and analysis of XDT

Description: The two principal mechanisms for hot spots generated in XDT are thought to be shear cracking and shear banding. Casual observation would not be sufficient to distinguish between the two in dynamic processes, since in either case a molten zone will develop rapidly and govern the ensuing behavior. The approaches to stability analyses are, however, very different for the two phenomena. Classically, cracking is treated as a two-dimensional problem in linear elasticity. Though nonlinear elastic and … more
Date: January 1, 1986
Creator: Dienes, J. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
captions transcript

[News Clip: LTV reaction]

Description: Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: January 28, 1986, 6:00 p.m.
Duration: 1 minute 34 seconds
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Video
Partner: UNT Libraries Special Collections
open access

High explosive modeling in 2D Euler code for shaped charge problems

Description: The object of this study is to incorporate a programmed burn model of high explosive into a two-dimensional, smeared shock Eulerian hydrodynamic code. Huygen's principle and Chapman-Jouguet theory are used in defining the detonation velocity and the location where the high-explosive energy is released. Precalculated burn information such as burn times, burn distances, burn intervals, and burn fractions are implemented into the code before the hydrodynamic actions take place. Two shaped charge p… more
Date: January 1, 1986
Creator: Lee, W. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Technique for megabar controlled strain experiments

Description: This design allows in one shot one experiment a range of pressures from 12 to 170 GPa and a selectable strain range (0 to 55%) in 304 stainless steel with 100% recovery. Development of the application of griding has enabled correlation, locally, of pressure and strain with structure and properties at a strain rate of 10/sup 6//s. Appropriate variations in momentum trap design can control strain in cylindrical implosion shock experiments. Pedestal type traps have shown significant improvement in… more
Date: January 1, 1986
Creator: Staudhammer, K.P. & Johnson, K.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Safety analysis of the existing 850 Firing Facility

Description: A safety analysis was performed to determine if normal operations and/or potential accidents at the 850 Firing Facility at Site 300 could present undue hazards to the general public, personnel at Site 300, or have an adverse effect on the environment. The normal operations and credible accidents that might have an effect on these facilities or have off-site consequences were considered. It was determined by this analysis that all but one of the hazards were either low or of the type or magnitud… more
Date: June 5, 1986
Creator: Odell, B.N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Railguns powered by explosive driven flux compression generators

Description: Explosive driven flux compression generators (FCG's) are single-shot devices that convert part of the energy of high explosives into electromagnetic energy. Some classes of these generators have served quite well as railgun power sources. In this paper and the following paper we describe strip and helical type FCG's, both of which are in use in the Los Alamos railgun program. Advantages and disadvantages these generators have for railgun power supplies will be discussed, together with experimen… more
Date: January 1, 1986
Creator: Fowler, C. M.; Zimmermann, E. L.; Cummings, C. E.; Davidson, R. F.; Foley, E.; Hawke, R. S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design concepts for a pulse power test facility to simulate EMP surges in overhead power lines. Part I. Fast pulse

Description: Objective of the study was to create conceptual designs of high voltage pulsers capable of simulating two types of electromagnetic pulses (EMPs) caused by a high-altitude nuclear burst; the slow rise time magnetohydrodynamic (MHD-EMP) and the fast rise time high-altitude EMP (HEMP). The pulser design was directed towards facilities capable of performing EMP vulnerability testing of components used in the national electric power system.
Date: February 1, 1986
Creator: Ramrus, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fiber optics applications in hostile environments

Description: This Conference focuses on applications of optical fibers in hostile environments. As the introductory paper in this Conference, this communication will trace the evolution of applications of fibers in hostile environments and explore some of the motivations for these applications. A few key examples will be used.
Date: January 1, 1986
Creator: Lyons, P. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Energy and Technology Review

Description: A specialized laser amplifier for use with velocity-measuring systems is described which makes possible detailed measurements of explosion-driven targets extending over long times. The experimental and diagnostic facilities of the Bunker 801 project enables sensitive and thorough hydrodynamics tests on the high-explosive components of nuclear devices. An improved spectrometry system has been developed covering the energy range from 0.025 eV to 20 MeV for use in radiation monitoring, and a new m… more
Date: February 1, 1986
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fallout forecasting: 1945-1962

Description: The delayed hazards of fallout from the detonations of nuclear devices in the atmosphere have always been the concern of those involved in the Test Program. Even before the Trinity Shot (TR-2) of July 16, 1945, many very competent, intelligent scientists and others from all fields of expertise tried their hand at the prediction problems. This resume and collection of parts from reports, memoranda, references, etc., endeavor to chronologically outline prediction methods used operationally in the… more
Date: March 1, 1986
Creator: Kennedy, W.R. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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