88 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "M Codes"  
Results: 1 - 24 next
open access

Computational modeling of MAGO'' and other magnetized target fusion concepts

Description: One possible way to obtain a preheated and magnetized plasma suitable for subsequent implosion is the MAGO'' concept. The unique MAGO discharge consists of a two chambers, with electrical current flowing in one chamber accelerating plasma flow into an implosion chamber. Up to 4 [times] 10[sup 13] D-T neutrons have been produced in the MAGO discharge. In this paper, we discuss our computational modeling of MAGO. Our objectives are to characterize the plasma, compare with the limited diagnostics … more
Date: January 1, 1993
Creator: Lindemuth, I. R.; Kirkpatrick, R. C.; Reinovsky, R. E.; Sheehey, P. T.; Thurston, R. S. & Wysocki, F. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Independent peer review of nuclear safety computer codes

Description: A structured process of independent computer code peer review has been developed to assist the US Nuclear Regulatory Commission (NRC) and the US Department of Energy in their nuclear safety missions. This paper focuses on the process that evolved during recent reviews of NRC codes.
Date: January 1, 1993
Creator: Boyack, B. E. & Jenks, R. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

MELCOR analyses of severe accident scenarios in Oconee, a B W PWR plant

Description: This paper presents the results and insights gained from MELCOR analyses of two severe accident scenarios, a Loss of Coolant Accident (LOCA) and a Station Blackout (TMLB) in Oconee, a Babcock Wilcox (B W) designed PWR with a large dry containment, and comparisons with Source Term Code Package (STCP) calculations of the same sequences. Results include predicted timing of key events, thermal-hydraulic response in the reactor coolant system and containment, and environmental releases of fission pr… more
Date: January 1, 1993
Creator: Madni, I.K.; Nimnual, S. (Brookhaven National Lab., Upton, NY (United States)) & Foulds, R. (Nuclear Regulatory Commission, Washington, DC (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Multiple Antenna Implementation System (MAntIS)

Description: The MAntIS code was developed as an aid to the design of radio frequency (RF) antennas for fusion applications. The code solves for the electromagnetic fields in three dimensions near the antenna structure with a realistic plasma load. Fourier analysis is used in the two dimensions that are tangential to the plasma surface and backwall. The third dimension is handled analytically in a vacuum region with a general impedance match at the plasma-vacuum interface. The impedance tensor is calculated… more
Date: January 1, 1993
Creator: Carter, M. D.; Batchelor, D. B. & Jaeger, E. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Multiple Antenna Implementation System (MAntIS)

Description: The MAntIS code was developed as an aid to the design of radio frequency (RF) antennas for fusion applications. The code solves for the electromagnetic fields in three dimensions near the antenna structure with a realistic plasma load. Fourier analysis is used in the two dimensions that are tangential to the plasma surface and backwall. The third dimension is handled analytically in a vacuum region with a general impedance match at the plasma-vacuum interface. The impedance tensor is calculated… more
Date: January 1, 1993
Creator: Carter, M. D.; Batchelor, D. B. & Jaeger, E. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Multiprocessing MCNP on an IBM RS/6000 cluster

Description: The advent of high-performance computer systems has brought to maturity programming concepts like vectorization, multiprocessing, and multitasking. While there are many schools of thought as to the most significant factor in obtaining order-of-magnitude increases in performance, such speedup can only be achieved by integrating the computer system and application code. Vectorization leads to faster manipulation of arrays by overlapping instruction CPU cycles. Discrete ordinates codes, which requ… more
Date: January 1, 1993
Creator: McKinney, G.W. (Los Alamos National Lab., NM (United States)) & West, J.T. (IBM Corp., Houston, TX (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Nonlinear wave predictions in ceramics

Description: Accurate numerical prediction of nonlinear waves in metals and ceramics is important in the design of many products including aerospace structures, automobile engines and odier devices. The material strength and fracture of ceramics must be predicted in order to achieve optimum designs. As part of a project to develop a reliable, robust, design computer program, a number of material strength and fracture models have been implemented into the MESA-2D hydrocode and the predictions from the code h… more
Date: January 1, 1993
Creator: Mandell, D. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Pressurization of a compartment due to the rupture of coolant piping

Description: The pressurization and venting of enclosed compartments due to the accidental rupture of coolant piping is a safety problem common to many nuclear facilities. The processes associated with such an accident are very complex, involving, in general, transient multiphase flows, interactions and mixing between the incoming flows and the gases in the compartment, and heat transfer with the surroundings. Since pipe rupture is associated with many phenomenological uncertainties, elaborate 3-D thermal-h… more
Date: January 1, 1993
Creator: Kot, C. A. & Hsieh, B. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A program for passively tracking a target using an array of sensors

Description: The problem of passively tracking a moving signal source has importance in a variety of applications such as radar, sonar, seismology, and radio astronomy. In many applications, only limited information is available about the signal source. It will be assumed here that only the signals which are detected by the sensors and the velocity of the source signal are known. The objective of this document is to present a program which passively tracks a target using an array of sensors. This program is… more
Date: January 1, 1993
Creator: Buhl, M. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

RF characteristics of the APS storage ring isolation valve

Description: The rf impedance of the isolation valve of the APS storage ring system was measured by the wire method with a synthetic pulse technique. The coupling impedance as well as the energy loss of the sector valve with and without an rf liner or screen, and the flange gap of the various sizes was measured. There appear to be resonances at certain frequencies without an rf liner that might cause an unacceptably large coupling impedance. Data with various sizes of the flange gap show that good rf contac… more
Date: January 1, 1993
Creator: Song, J. J. & Kustom, R. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Computational modeling of ``MAGO`` and other magnetized target fusion concepts

Description: One possible way to obtain a preheated and magnetized plasma suitable for subsequent implosion is the ``MAGO`` concept. The unique MAGO discharge consists of a two chambers, with electrical current flowing in one chamber accelerating plasma flow into an implosion chamber. Up to 4 {times} 10{sup 13} D-T neutrons have been produced in the MAGO discharge. In this paper, we discuss our computational modeling of MAGO. Our objectives are to characterize the plasma, compare with the limited diagnostic… more
Date: February 1, 1993
Creator: Lindemuth, I. R.; Kirkpatrick, R. C.; Reinovsky, R. E.; Sheehey, P. T.; Thurston, R. S. & Wysocki, F. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Independent peer review of nuclear safety computer codes

Description: A structured process of independent computer code peer review has been developed to assist the US Nuclear Regulatory Commission (NRC) and the US Department of Energy in their nuclear safety missions. This paper focuses on the process that evolved during recent reviews of NRC codes.
Date: February 1, 1993
Creator: Boyack, B. E. & Jenks, R. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Assessment of radiocarbon in the Savannah River Site Environment

Description: This report is a radiological assessment of [sup 14]C releases from the Savannah River Site. During the operation of five production reactors [sup 14]C has been produced at SRS. Approximately 3000 curies have been released to the atmosphere but there are no recorded releases to surface waters. Once released, the [sup 14]C joins the carbon cycle and a portion enters the food chain. The overall radiological impact of SRS releases on the offsite maximum individual can be characterized by a dose of… more
Date: March 1, 1993
Creator: Carlton, W. H.; Evans, A. G.; Murphy, C. E. Jr. & Tuck, D. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Assessment of radiocarbon in the Savannah River Site Environment

Description: This report is a radiological assessment of {sup 14}C releases from the Savannah River Site. During the operation of five production reactors {sup 14}C has been produced at SRS. Approximately 3000 curies have been released to the atmosphere but there are no recorded releases to surface waters. Once released, the {sup 14}C joins the carbon cycle and a portion enters the food chain. The overall radiological impact of SRS releases on the offsite maximum individual can be characterized by a dose of… more
Date: March 1, 1993
Creator: Carlton, W. H.; Evans, A. G.; Murphy, C. E. Jr. & Tuck, D. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Criticality benchmark comparisons leading to cross-section upgrades

Description: For several years criticality benchmark calculations with COG. COG is a point-wise Monte Carlo code developed at Lawrence Livermore National Laboratory (LLNL). It solves the Boltzmann equation for the transport of neutrons and photons. The principle consideration in developing COG was that the resulting calculation would be as accurate as the point-wise cross-sectional data, since no physics computational approximations were used. The objective of this paper is to report on COG results for crit… more
Date: March 1, 1993
Creator: Alesso, H. P.; Annese, C. E.; Heinrichs, D. P.; Lloyd, W. R. & Lent, E. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

DNA Radiation Environments Program Spring 1991 2-meter box experiments and analyses

Description: This report summarizes the Spring 1991 2-m Box experiments that were performed at the Army Pulse Radiation Facility (APRF) at Aberdeen Proving Ground. These studies were sponsored by the Defense Nuclear Agency (DNA) under the Radiation Environments Program to obtain measured data for benchmarking the Adjoint Monte Carlo Code System, MASH, Version 1.0. The MASH code system was developed for the Department of Defense and NATO for calculating neutron and gamma-ray radiation fields and shielding pr… more
Date: March 1, 1993
Creator: Santoro, R. T. & Whitaker, S. Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DNA Radiation Environments Program Spring 1991 2-meter box experiments and analyses. [DEfense Nuclear Agency (DNA)]

Description: This report summarizes the Spring 1991 2-m Box experiments that were performed at the Army Pulse Radiation Facility (APRF) at Aberdeen Proving Ground. These studies were sponsored by the Defense Nuclear Agency (DNA) under the Radiation Environments Program to obtain measured data for benchmarking the Adjoint Monte Carlo Code System, MASH, Version 1.0. The MASH code system was developed for the Department of Defense and NATO for calculating neutron and gamma-ray radiation fields and shielding pr… more
Date: March 1, 1993
Creator: Santoro, R. T. & Whitaker, S. Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

FEEST: A method for tabulating equation of state and opacity tables

Description: The tabulation of equations of state presently used by codes which carry temperature and density as independent variables, provides separate tables for pressure (P) and specific internal energy ({var_epsilon}) as functions of the temperature (T) and density ({rho}). Both P and {var_epsilon} are determined by bi-quadratic interpolation in tables of P and {var_epsilon} values arranged on a rectangular grid in the T-{rho} plane. The system was designed for use on the 709-7094 generation of compute… more
Date: March 1, 1993
Creator: White, R. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

MELCOR analyses of severe accident scenarios in Oconee, a B&W PWR plant

Description: This paper presents the results and insights gained from MELCOR analyses of two severe accident scenarios, a Loss of Coolant Accident (LOCA) and a Station Blackout (TMLB) in Oconee, a Babcock & Wilcox (B&W) designed PWR with a large dry containment, and comparisons with Source Term Code Package (STCP) calculations of the same sequences. Results include predicted timing of key events, thermal-hydraulic response in the reactor coolant system and containment, and environmental releases of fission … more
Date: March 1, 1993
Creator: Madni, I. K.; Nimnual, S. & Foulds, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Multiprocessing MCNP on an IBM RS/6000 cluster

Description: The advent of high-performance computer systems has brought to maturity programming concepts like vectorization, multiprocessing, and multitasking. While there are many schools of thought as to the most significant factor in obtaining order-of-magnitude increases in performance, such speedup can only be achieved by integrating the computer system and application code. Vectorization leads to faster manipulation of arrays by overlapping instruction CPU cycles. Discrete ordinates codes, which requ… more
Date: March 1, 1993
Creator: McKinney, G. W. & West, J. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

On the coupling of electromagnetic radiation into cavities

Description: A two-dimensional fully electromagnetic finite-difference time-domain code was used to investigate the penetration of electromagnetic radiation into cavities with apertures. The study used two different temporal waveforms to compare the coupling efficiency. We found that cavity modes were excited due to the induced surface current caused by the incident radiation pulse. The fast-rise pulse, which contained higher frequency components, was found to have higher coupling efficiency. The effects of… more
Date: March 1, 1993
Creator: Kwan, T. J. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Pitfalls in computer code use in criticality analyses

Description: Well-established computer codes are rendered useless if the user does not understand the underlying principles governing the code. A sampling of Monte Carlo Neutron Photon (MCNP) and KENO V.a computer code users has revealed a common misuse of the cross-section tables because of lack of foreknowledge. Cross-section tables are available to MCNP that account for molecular binding of less massive nuclei. However, the default tables are based upon collision physics of a free atom. The cross section… more
Date: March 1, 1993
Creator: Schwinkendorf, K. N.; Erickson, D. G.; Heer, D. L. & Toffer, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Sensor Based Process Control (SBPC) Laboratories Directed Research and Development (LDRD)

Description: This report describes the activities and results of an LDRD entitled Sensor Based Process Control. This research examined the needs of the plating industry for monitor and control capabilities with particular emphasis on water effluent from rinse baths. A personal computer-based monitor and control development system was used as a test bed.
Date: March 1, 1993
Creator: Wronosky, John B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A dynamic explosive model for MACH2 with applications to magnetic flux compression generators

Description: An explosive model has recently been designed and added to MACH2 to enable that code to be used as a tool for studying explosive magnetic flux compression generators. This report describes this model and gives examples of its use in both one- and two-dimensional simulations. A description of the model is given and one-dimensional simulations will be discussed. Also, we show examples of two-dimensional simulations. Appendices contain input decks for the one- and two-dimensional simulations and a… more
Date: March 2, 1993
Creator: Watrous, John J. & Frese, Michael H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen