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Operation of the repeating pneumatic injector on TFTR and design of an 8-shot deuterium pellet injector

Description: The repeating pneumatic hydrogen pellet injector, which was developed at the Oak Ridge National Laboratory (ORNL), has been installed and operated on the Tokamak Fusion Test Reactor (TFTR). The injector combines high-speed extruder and pneumatic acceleration technologies to propel frozen hydrogen isotope pellets repetitively at high speeds. The pellets are transported to the plasma in an injection line that also serves to minimize the gas loading on the torus; the injection line incorporates a … more
Date: January 1, 1985
Creator: Combs, S. K.; Milora, S. L.; Foust, C. R.; Baylor, L. R.; Burris, R. D.; Fisher, P. W. et al.
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Partner: UNT Libraries Government Documents Department
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Molecular dynamics simulations

Description: The molecular dynamics computer simulation discovery of the slow decay of the velocity autocorrelation function in fluids is briefly reviewed in order to contrast that long time tail with those observed for the stress autocorrelation function in fluids and the velocity autocorrelation function in the Lorentz gas. For a non-localized particle in the Lorentz gas it is made plausible that even if it behaved quantum mechanically its long time tail would be the same as the classical one. The general… more
Date: July 1, 1985
Creator: Alder, B. J.
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Partner: UNT Libraries Government Documents Department
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Implicit Plasma Simulation

Description: Implicit time integration methods have been used extensively in numerical modelling of slowly varying phenomena in systems that also support rapid variation. Examples include diffusion, hydrodynamics and reaction kinetics. This article discussed implementation of implicit time integration in plasma codes of the ''particle-in-cell'' family, and the benefits to be gained.
Date: March 3, 1985
Creator: Langdon, A. B.
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Partner: UNT Libraries Government Documents Department
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Numerical simulation of heat exchanger

Description: Accurate and detailed knowledge of the fluid flow field and thermal distribution inside a heat exchanger becomes invaluable as a large, efficient, and reliable unit is sought. This information is needed to provide proper evaluation of the thermal and structural performance characteristics of a heat exchanger. It is to be noted that an analytical prediction method, when properly validated, will greatly reduce the need for model testing, facilitate interpolating and extrapolating test data, aid i… more
Date: January 1, 1985
Creator: Sha, W.T.
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Partner: UNT Libraries Government Documents Department
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Relativistic hydrodynamics, heavy ion reactions and antiproton annihilation

Description: The application of relativistic hydrodynamics to relativistic heavy ions and antiproton annihilation is summarized. Conditions for validity of hydrodynamics are presented. Theoretical results for inclusive particle spectra, pion production and flow analysis are given for medium energy heavy ions. The two-fluid model is introduced and results presented for reactions from 800 MeV per nucleon to 15 GeV on 15 GeV per nucleon. Temperatures and densities attained in antiproton annihilation are given.… more
Date: January 1, 1985
Creator: Strottman, D.
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Partner: UNT Libraries Government Documents Department
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Nuclear equation of state, general relativity and supernovae explosions

Description: Prompt explosions are obtained in hydrodynamic simulations for the 12 Msub solar and 15 Msub solar type II supernova initial models of Weaver and Woosley, when the nuclear equation of state is sufficiently soft and when general relativity is included. 12 refs.
Date: January 1, 1985
Creator: Kahana, S.
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Partner: UNT Libraries Government Documents Department
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High temperature experiment for accelerator inertial fusion

Description: The High Temperature Experiment (HTE) is intended to produce temperatures of 50 to 100 eV in solid density targets driven by heavy ion beams from a multiple beam induction linac. The fundamental variables (particle species, energy, number of beamlets, current and pulse length) must be fixed to achieve the temperature at minimum cost, subject to criteria of technical feasibility and relevance to the development of a Fusion Driver. The conceptual design begins with an assumed (radiation-limited) … more
Date: May 1, 1985
Creator: Lee, Edward P.
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Partner: UNT Libraries Government Documents Department
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Numerical simulations of valley ventilation and pollutant transport

Description: As a part of the siting methodology task for the DOE oil shale project the Los Alamos National Laboratory three-dimensional atmospheric models were used to assess potential environmental problems associated with future development of oil shale energy in Colorado. An area of 200 km x 200 km centered at Brush Creek, Colorado, where the ASCOT conducted extensive meteorological and tracer experiments in September/October 1984, was chosen as an initial simulation area. In this paper, preliminary sim… more
Date: January 1, 1985
Creator: Yamada, T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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In-core measurements of U-5 wt % fissium alloy thermal conductivity

Description: Instrumented subassemblies have inserted into the Experimental Breeder Reactor II (EBR-II) in order to monitor thermal-hydraulic phenomena. For one such subassembly, a time history of the in-core themocouples was evaluated and used to determine the fuel thermal conductivity. Although several researchers have evaluated fuel conductivity for unirradiated conditions, little data is available for long term irradiation. Further, most of the data has been evaluated under laboratory conditions which, … more
Date: January 1, 1985
Creator: Betten, P.R.
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Partner: UNT Libraries Government Documents Department
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Evaluation of BWR emergency procedure guidelines for BWR ATWS using RAMONA-3B code

Description: An MSIV Closure ATWS calculation for a typical BWR/4 (Browns Ferry, Unit 1) was performed using the RAMONA-3B code which is a BWR systems transient code combining three-dimensional neutronic core representation with multi-channel one-dimensional thermal hydraulics. The main objective of the study was to perform a best-estimate evaluation of the recently proposed Emergency Procedure Guidelines for Anticipated Transients Without Scram (ATWS). Emphasis was placed on evaluating the effects of lower… more
Date: January 1, 1985
Creator: Neymotin, L.; Slovik, G.; Cazzoli, E. & Saha, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fast reactor safety: proceedings of the international topical meeting. Volume 2. [R]

Description: The emphasis of this meeting was on the safety-related aspects of fast reactor design, analysis, licensing, construction, and operation. Relative to past meetings, there was less emphasis on the scientific and technological basis for accident assessment. Because of its broad scope, the meeting attracted 217 attendees from a wide cross section of the design, safety analysis, and safety technology communities. Eight countries and two international organizations were represented. A total of 126 pa… more
Date: July 1, 1985
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Partner: UNT Libraries Government Documents Department
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Use of logic flowgraph models in a computer aided process analysis and management system

Description: The development of a multi-function computer-aided process analysis and management (CAPAM) system, to be implemented in nuclear power plant control rooms, is proposed and discussed. The design goals identified for such a system are early disturbance detection and diagnosis, accompanied by identification of the best possible recovery actions or alternative success paths. The CAPAM structure is articulated in three functional levels with dedicated CRT displays. Increasing amount of diagnostic or … more
Date: July 1, 1985
Creator: Guarro, S. B. & Okrent, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Method for LEFM analysis of RPV during SBLOCA

Description: A somewhat simplified two-dimensional linear elastic fracture mechanics model of the beltline of a RPV is presented. The fracture mechanics model used tends to be conservative in the sense that it ignores possible beneficial effects of warm prestressing and cladding. For LEFM studies that require a large number of analyses on the same geometry but with different loads and material toughnesses, the superposition principle is an accurate and simple method to determine K/sub 1/, provided that K/su… more
Date: January 1, 1985
Creator: Iskander, S.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Eigenmodes of classical fluids in thermal equilibrium

Description: The eigenmodes of a classical fluid in thermal equilibrium are discussed. For long wavelengths and times, they can be computed from linear hydrodynamic equations. They are then the hydrodynamic modes, in particular, the heat mode, which describes the diffusion of heat in the fluid and two sound modes. For short wavelengths and times they can be derived from linear kinetic operators. For low densities, the linear Boltzmann operator can be employed and the three most important eigenmodes are dire… more
Date: January 1, 1985
Creator: Cohen, E.G.D.
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Partner: UNT Libraries Government Documents Department
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Technique of analysis and error detection for thermo-hydraulic system data

Description: Statistical techniques based on estimation theory were developed for the analysis of steady-state data from thermo-hydraulic systems, which could be either experimental loops or operating power plants. The method seeks to resolve errors in the component heat balances which describe the system, to obtain system parameter estimates which are more accurate than the raw data, and to flag possible faulty sensors. Sample results are given for the analysis of test data from the Sodium Loop Safety Faci… more
Date: January 1, 1985
Creator: Bordner, G.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Relaxation of spheromak plasmas toward a minimum-energy state through global magnetic fluctuations

Description: Globally coherent modes which are observed during formation in the S-1 Spheromak plasma are shown to be important for flux conversion and plasma relaxation toward a minimum-energy state. A significant finding is the temporal progression through the n = 5, 4, 3, 2; m = 1 mode sequence as q rises through rational fractions m/n, where n and m are defined by the functional dependence e/sup i(nphi + mtheta/) of the fluctuations on toroidal angle phi and poloidal angle theta. Resistive MHD analysis p… more
Date: July 1, 1985
Creator: Janos, A.; Hart, G.W. & Yamada, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Harmonic generation of ion waves due to Brillouin backscattering

Description: We report results of simulations of stimulated Brillouin backscatter in which we see the second spatial harmonic of the ion density fluctuation and compare with linear, fluid theory. We also describe examples of the competition between Raman and Brillouin backscatter. 21 refs., 3 figs.
Date: May 22, 1985
Creator: Estabrook, K.; Kruer, W. L. & Haines, M. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Heat Exchanger Vibration Analysis (HXVA) for Prediction of Tube Bundle Instabilities

Description: Pre and postprocessors have been written for an established hydraulic program (COMMIX-IHX) which enables prediction of the internal crossflow field for each tube of Argonne's Test Heat Exchanger and identification of those tubes most likely to experience fluid-elastic instability, together with the instability vibration mode. While the direct use of the HXVA method is limited to single pass, single-segmentally baffled tube bundle configurations, its algorithms and methods can be applied to any … more
Date: May 1985
Creator: Mulcahy, T. M.; Wambsganss, M. W. & Yang, C. I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Liquid storage tanks under vertical excitation

Description: Until recently, the hydrodynamic effects on liquid storage tanks induced by an earthquake excitation were basically treated for the horizontal component of the earthquake. Recent studies, however, showed that the hydrodynamic effects due to the vertical component of an earthquake may be significant. In these studies the tank is assumed to be fixed at the bottom. This paper is concerned with the hydrodynamic behavior of liquid storage tanks induced by vertical earthquake input excitation. First,… more
Date: January 1, 1985
Creator: Philippacopoulos, A.J.
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Partner: UNT Libraries Government Documents Department
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Preliminary evaluation of PSCM and BIPP melter design and operating conditions using physical modeling

Description: The Glass Melter Physical Modeling investigation was initiated to support Pacific Northwest Laboratory (PNL) Hanford Waste Vitrification Program. Specifically, results discussed herein are those of the modeled B-Plant Immobilization Pilot Plant (BIPP) and Pilot Scale Ceramic Melter (PSCM) designs. The purpose of this study was to evaluate various melter design features using laboratory scale models. Hydrodynamic, thermal, and electrical similarity between the modeling fluid and the molten glass… more
Date: May 1, 1985
Creator: Skarda, R.J.; Hauser, S.G. & Fort, J.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Implicit finite element structural dynamic formulation for long-duration accidents in reactor piping systems

Description: This taper describes an implicit three-dimensional finite-element formulation for the structural analysis of reactor piping system. The numerical algorithm considers hoop, flexural, axial, and torsion modes of the piping structures. It is unconditionally stable and can be used for calculation of piping response under static or long duration dynamic loads. The method uses a predictor-corrector, successive iterative scheme which satisfies the equilibrium equations. A set of stiffness equations re… more
Date: January 1, 1985
Creator: Wang, C. Y.
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Partner: UNT Libraries Government Documents Department
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Recent development of three-dimensional piping code SHAPS

Description: This paper describes the recent development of the three-dimensional, structural, and hydrodynamic analysis piping code SHAPS. Several new features have been incorporated into the program, including (1) an elbow hydrodynamic model for analyzing the effect of global motion on the pressure-wave propagation, (2) a component hydrodynamic model for treating fluid motion in the vicinity of rigid obstacles and baffle plates, (3) the addition of the implicit time integration scheme in the structural-dy… more
Date: January 1, 1985
Creator: Wang, C. Y. & Zeuch, W. R.
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Partner: UNT Libraries Government Documents Department
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Results of recent reactor-material tests on dispersal of oxide fuel from a disrupted core

Description: The results of experimental investigations and related analyses are reported addressing the dispersal of molten oxide fuel from a disrupted core via various available pathways for the CRBR system. These investigations included the GAPFLOW tests in which pressure-driven and gravity drainage tests were performed using dispersal pathways mocking up the intersubassembly gaps, the CAMEL C6 and C7 tests in which molten fuel entered sodium-filled control assembly ducts under prototypic thermal-hydraul… more
Date: January 1, 1985
Creator: Spencer, B. W.; Wilson, R. J.; Vetter, D. L.; Erickson, E. G. & Dewey, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Faster-than-real-time simulation of nuclear reactor accidents: the TRAC-NPA code

Description: A reactor safety code that provides faster-than-real-time capabilities greatly enhances the effectiveness of an analyst. We have developed a new version of the Transient Reactor Analysis Code, TRAC-NPA, which is capable of running many one- and three-dimensional transients faster than real time on current computers. TRAC is an Eulerian finite-difference code designed to model transient, two-phase, multidimensional, steam-water flow in nuclear reactors. TRAC-NPA is fast running both because it e… more
Date: April 1, 1985
Creator: Woodruff, S.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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