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Full-wave calculations in flux coordinates for toroidal geometry

Description: A new 2-D full-wave code, HYPERION, employing a poloidal and toroidal mode expansion and including the toroidal terms arising in the wave equation has been developed. It is based on the existing modules developed for the MHD stability codes and uses as input the tokamak equilibria calculated with the RSTEQ code. At present the plasma response is described by the collisionally broadened cold plasma conductivity. However, the code is written in straight field line coordinates, this permits the ac… more
Date: January 1, 1988
Creator: Carreras, B. A.; Lynch, V. E.; Jaeger, E. F. & Batchelor, D. B.
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Partner: UNT Libraries Government Documents Department
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HELPER: a superintelligent terminal based on RT-11

Description: The HELPER minicomputer hardware and software capabilities are thoroughly explained and critically reviewed. HELPER is a cost-effective assistant to an interactive host system. The recommendations are to assign specific types of tasks to HELPER and to study the resulting effects on users. Improvements to the present HELPER hardware are also suggested. 2 figures.
Date: January 1, 1977
Creator: Schultz, D.E.
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Partner: UNT Libraries Government Documents Department
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Analytical and experimental studies of heat pipe radiation cooling of hypersonic propulsion systems

Description: Preliminary, research-oriented, analytical and experimental studies were completed to assess the feasibility of using high-temperature heat pipes to cool hypersonic engine components. This new approach involves using heat pipes to transport heat away from the combustor, nozzle, or inlet regions, and to reject it to the environment by thermal radiation from an external heat pipe nacelle. For propulsion systems using heat pipe radiation cooling (HPRC), it is possible to continue to use hydrocarbo… more
Date: January 1, 1992
Creator: Martin, R.A.; Merrigan, M.A.; Elder, M.G.; Sena, J.T.; Keddy, E.S. (Los Alamos National Lab., NM (United States)) & Silverstein, C.C. (CCS Associates, Bethel Park, PA (United States))
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Partner: UNT Libraries Government Documents Department
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Analysis of depressurized loss-of-forced cooling transients by HERA

Description: The Modular High-Temperature Gas-Cooled Reactor (MHTGR) is one of the next generation reactors, which has passive safety features. Among these safety features is the ability to withstand a depressurized, loss-of-forced cooling of the reactor without release of fission products from the primary containment. In order to assess the capability of the MHTGR to withstand this type of accident condition, the thermal behavior of the reactor core must be well understood. To accomplish this, we have empl… more
Date: January 1, 1991
Creator: Rider, W. J. & Cappiello, M. W.
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Partner: UNT Libraries Government Documents Department
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Thermal responses in underground experiments in a dome salt formation

Description: To provide design information for a radwaste repository in dome salt, in-situ experiments with nonradioactive heat sources are planned. Three such experiments using electrical heat sources are scheduled to be carried out in a salt dome. The purpose of these experiments is to acquire rock mechanics data to ascertain the structural deformation due to the thermal load imposed, to study brine migration and corrosion, and to provide thermal data. A data acquisition system is provided with these expe… more
Date: January 1, 1977
Creator: Llewellyn, G.H.
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Partner: UNT Libraries Government Documents Department
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An HMS/TRAC analysis of a high-level radioactive waste tank

Description: It has been observed that a high-level radioactive waste tank generates quantities of hydrogen and nitrous oxide mixtures that are potentially well within flammability limits. These gases are produced from chemical and nuclear decay reactions in a slurry of radioactive waste material. The slurry is covered by a thick crust composed of sodium nitrate and nitrite salts. Significant amounts of the combustible and reactant gases are produced over a 3- to 4-month period before the crust ruptures and… more
Date: January 1, 1991
Creator: Travis, J. R.; Nichols, B. D.; Spore, J. W. & Wilson, T. L.
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Partner: UNT Libraries Government Documents Department
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Heights integrated model as instrument for simulation of hydHeights Integrated Model as Instrument for Simulation of Hydrodynamic, Radiation Transport, and Heat Conduction Phenomena of Laser-Produced Plasma in EUV Applications.

Description: The HEIGHTS integrated model has been developed as an instrument for simulation and optimization of laser-produced plasma (LPP) sources relevant to extreme ultraviolet (EUV) lithography. The model combines three general parts: hydrodynamics, radiation transport, and heat conduction. The first part employs a total variation diminishing scheme in the Lax-Friedrich formulation (TVD-LF); the second part, a Monte Carlo model; and the third part, implicit schemes with sparse matrix technology. All mo… more
Date: January 16, 2007
Creator: Sizyuk, V.; Hassanein, A.; Morozov, V.; Sizyuk, T. & Science, Mathematics and Computer
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Comparative simulations of a two-layer landfill barrier using the HELP Version 2. 0 and UNSAT-H Version 2. 0 computer codes

Description: This report documents the results of a simulation of the performance of a two-layer infiltration barrier for a nonradioactive dangerous waste landfill (NRDWL) at the US Department of Energy's Hanford Site in semi-arid southeast Washington State. The performance of the barrier was simulated for a period of 10 years using the UNSAT-H version 2.0 groundwater flow computer code. Pacific Northwest Laboratory performed this simulation to compare results using UNSAT-H 2.0 with those of the US Env… more
Date: January 1, 1991
Creator: Nichols, W.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Assessing economic consequences of radiation accidents

Description: This project reviewed the literature on the economic consequences of accidents to determine the availability of assessment methods and data and their applicability to the high-level radioactive waste (HLW) disposal system before closure; determined needs for expansion, revision, or adaptation of methods and data for modeling economic consequences of accidents of the scale projected for the disposal system; and gathered data that might be useful for the needed revisions. 8 refs., 1 tab.
Date: January 1, 1987
Creator: Rowe, M. D.; Lee, J. C.; Grimshaw, C. A. & Kalb, P. D.
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Partner: UNT Libraries Government Documents Department
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Status of work at PNL supporting dry storage of spent fuel

Description: Three projects related to dry storage of light-water reactor spent fuel are being conducted at Pacific Northwest Laboratory. Performance testing of six dry storage systems (four metal casks and two concrete storage systems) has been completed and results compiled. Two computer codes for predicting spent fuel and storage system thermal performance, COBRA-SFS and HYDRA-II, have been developed and have been reviewed by the US Nuclear Regulatory Commission. Air oxidation testing of spent fuel was c… more
Date: January 1, 1992
Creator: Cunningham, M. E.; McKinnon, M. A.; Michener, T. E.; Thomas, L. E. & Thornhill, C. K.
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Partner: UNT Libraries Government Documents Department
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Event simulation for the WA80 experiment

Description: The HIJET and LUND event generators are compared. It is concluded that for detector construction and design of experimental setups, the differences between the two models are marginal. The coverage of the WA80 setup in pseudorapidity and energy is demonstrated. The performance of some of the WA80 detectors (zero-degree calorimeter, wall calorimeter, multiplicity array, and SAPHIR lead-glass detector) is evaluated based on calculations with the LUND or the HIJET codes combined with codes simulat… more
Date: January 1, 1986
Creator: Sorensen, S.P.
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Partner: UNT Libraries Government Documents Department
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Cavity-to-cavity interaction in nucleate boiling: The effect of heat conduction within the heater

Description: This paper presents a numerical study aimed at analyzing bubble behavior as a function of site location. The effects of site distribution on the nucleate boiling curve are examined. Simple local-instantaneous models that mimic the bubble behavior on the boiling surface were implemented into a three-dimensional finite control volume conduction code. For a given site density, sample cases were run for uniform and nonuniform site distribution. The authors results indicate considerable deviation fr… more
Date: January 1, 1991
Creator: Pasamehmetoglu, K.O. & Nelson, R.A.
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Partner: UNT Libraries Government Documents Department
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Infiltration experiment for closure cap evaluation at the Savannah River Site

Description: This document discusses several large waste disposal facilities at the Savannah River Site which are being closed. These facilities include two seepage basins and the low-level waste disposal facility. The key element of the closures is the construction of a cap system to limit the infiltration of water which might reach the disposed waste. Cap designs have been modeled using the Hydrologic Evaluation of Landfill Performance (HELP) computer code. This code was developed by the US Army Corps of … more
Date: January 1, 1990
Creator: Roddy, N. S. & Cook, J. R.
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Partner: UNT Libraries Government Documents Department
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Uranium waste disposal at the Savannah River Site

Description: The Savannah River Site generates waste containing depleted, natural, and enriched uranium residue. The past and current practice for disposal of this waste at the Savannah River Site have been assessed using radionuclide pathway analysis to estimate environmental impact of closure alternatives for existing disposal sites, and to assist in the development of improved disposal facilities in the near future. This paper outlines the status of uranium waste management technology as currently practi… more
Date: January 1, 1990
Creator: Cook, J. R.; McDonell, W. R. & Wilhite, E. L.
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Partner: UNT Libraries Government Documents Department
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A combined GIS-HEC procedure for floodplain analyses

Description: The Hydrologic Engineering Center's Flood-Hydrograph (HEC-1) and Water Surface Profile (HEC-2) models are routinely used to define floodplain elevations. Detailed topographic data are commonly available from graphic information systems (GIS). These disjointed technologies can be combined if the GIS system has a drainage recognition capability. A conceptual procedure is suggested for incorporating this feature into the GIS framework so that cross- sectional information can be extracted and expor… more
Date: January 1, 1991
Creator: McLin, S.G. (Los Alamos National Lab., NM (United States)) & Fuller, G.W. (Autometric, Inc., Lakewood, CO (United States))
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Partner: UNT Libraries Government Documents Department
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Hybrid codes: Methods and applications

Description: In this chapter we discuss hybrid'' algorithms used in the study of low frequency electromagnetic phenomena, where one or more ion species are treated kinetically via standard PIC methods used in particle codes and the electrons are treated as a single charge neutralizing massless fluid. Other types of hybrid models are possible, as discussed in Winske and Quest, but hybrid codes with particle ions and massless fluid electrons have become the most common for simulating space plasma physics phen… more
Date: January 1, 1991
Creator: Winske, D. (Los Alamos National Lab., NM (USA)) & Omidi, N. (California Univ., San Diego, La Jolla, CA (USA))
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Partner: UNT Libraries Government Documents Department
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System transient response to loss of off-site power

Description: A simultaneous trip of the reactor, main circulation pumps, secondary coolant pumps, and pressurizer pump due to loss of off-site power at the High Flux Isotope Reactor (HFIR) located at the Oak Ridge National Laboratory (ORNL) has been analyzed to estimate available safety margin. A computer model based on the Modular Modeling System code has been used to calculate the transient response of the system. The reactor depressurizes from 482.7 psia down to about 23 psia in about 50 seconds and rema… more
Date: January 1, 1990
Creator: Sozer, A.
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Partner: UNT Libraries Government Documents Department
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HIJET: a Monte Carlo event generator for P-nucleus-nucleus collisions

Description: Comparisons are shown for the HIJET generated data and measured data for average multiplicities, rapidity distributions, and leading proton spectra in proton-nucleus and heavy ion reactions. The algorithm for the generator is one of an incident particle on a target of uniformly distributed nucleons. The dynamics of the interaction limit secondary interactions in that only the leading baryon may re-interact with the nuclear volume. Energy and four momentum are globally conserved in each event. 6… more
Date: January 1, 1985
Creator: Ludlam, T.; Pfoh, A. & Shor, A.
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Partner: UNT Libraries Government Documents Department
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Modification of LAMPF's magnet-mapping code for offsets of center coordinates

Description: One of the magnet measurements performed at LAMPF is the determination of the cylindrical harmonics of a quadrupole magnet using a rotating coil. The data are analyzed with the code HARMAL to derive the amplitudes of the harmonics. Initially, the origin of the polar coordinate system is the axis of the rotating coil. A new coordinate system is found by a simple translation of the old system such that the dipole moment in the new system is zero. The origin of this translated system is referred t… more
Date: January 1, 1991
Creator: Hurd, J.W.; Gomulka, S.; Merrill, F. & Weintraub, B.L.
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Partner: UNT Libraries Government Documents Department
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Status of high-temperature heat-pipe technology. [Performance studies using HTPIPE computer code]

Description: This paper discusses the application of heat pipes to nuclear reactor space power systems. Characteristics of the device that favor such an application are described and recent results of current technology development programs are presented. Research areas that will need to be addressed in demonstrating that adequate lifetimes can be achieved with evaporation/condensation cycles operating at high temperatures in a reactor environment are also discussed.
Date: January 1, 1982
Creator: Ranken, W.A.
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Partner: UNT Libraries Government Documents Department
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Interim report on the meteorological database

Description: The Hanford Environmental Dose Reconstruction (HEDR) Project is estimating radiation doses that individuals may have received from operations at Hanford from 1944 to the present. An independent Technical Steering Panel (TSP) directs the project, which is being conducted by the Battelle, Pacific Northwest Laboratories in Richland, Washington. The goals of HEDR, as approved by the TSP, include dose estimates and determination of confidence ranges for these estimates. This letter report describes … more
Date: January 1, 1993
Creator: Stage, S.A.; Ramsdell, J.V.; Simonen, C.A. & Burk, K.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Radiographic studies and hydrocode simulations of two tantalum EFPs (explosively formed penetrators)

Description: The Army Research Development and Engineering Center (ARDEC) commissioned Los Alamos to provide Honeywell, Inc. with one high- energy flash radiograph for each of two explosively formed penetrators (EFPs) of tantalum. The two axisymmetric warheads were identical in their basic design, but their liner contours were different. The first shot, which we designate as H853, used Honeywell's liner design /number sign/1; the second shot, H854, used design /number sign/2. The experiments were planned an… more
Date: January 1, 1988
Creator: Schwalbe, L.A.
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Partner: UNT Libraries Government Documents Department
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Update on the meso-microscale meteorological hierarchy

Description: SIGTRA is designed to define the height of the material layer and provide interpolated mass and energy fluxes to VARYME. It also provides interpolated winds, temperatures, and potential densities at levels within the material layer. VARTRA uses similarity theory surface energy budget considerations, and the VARYME solutions to perturb the SIGMET profiles. It is the principal vehicle for converting the VARYME solutions into wind and temperature profiles and for incorporating the effects of local… more
Date: January 1, 1987
Creator: Williams, M. D.
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Partner: UNT Libraries Government Documents Department
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Validation of the HOTCHAN code for analyzing the EBR-II driver following loss of flow without scram

Description: A series of experiments involving unprotected (no scram) loss-of-primary flow (LOF) down to natural convection was successfully conducted in February 1985 on the Experimental Breeder Reactor-II (EBR-II). The predicted and measured behavior of a special instrumented assembly, the XX09 fueled INSAT, is compared for the most severe test in the group to demonstrate the validation of the thermal-hydraulic code HOTCHAN. The particular test of interest in this paper was initiated at full power by trip… more
Date: January 1, 1987
Creator: Mohr, D.; Chang, L.K.; Betten, P.R.; Feldman, E.E. & Planchon, H.P.
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Partner: UNT Libraries Government Documents Department
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