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  Partner: UNT Libraries Government Documents Department
 Decade: 1970-1979
 Collection: Technical Report Archive and Image Library
Computer-Code Formulation for Three-Dimensional HEXCAN Response Coupled with Internal Hydrodynamics

Computer-Code Formulation for Three-Dimensional HEXCAN Response Coupled with Internal Hydrodynamics

Date: March 1976
Creator: Marchertas, A. H. & Julke, R. T.
Description: A procedure is described for the dynamic analysis of a fast-reactor hexagonal subassembly. The internals of the fuel subassembly are treated by an axisymmetric hydrodynamic code REXCO-HT which, among other properties, possesses a model of an MFCI pressure source. The housing of the fuel subassembly is handled by the SADCAT code, which is based on a triangular finite element in three-dimensional space. The code is used to illustrate the discrepancies involved if the hexcan is modeled by a cylinder of the same thickness. A study is also made of the reduction of cylinder thickness such that the same final cylindrical deformation can be predicted. A discussion in arriving at such an equivalence is offered.
Contributing Partner: UNT Libraries Government Documents Department
Examination and Evaluation of in-Reactor Fracture of Shroud Tubes in Mixed-Oxide Fuel Experiment X159

Examination and Evaluation of in-Reactor Fracture of Shroud Tubes in Mixed-Oxide Fuel Experiment X159

Date: June 1977
Creator: Flinn, J. E.
Description: During disassembly and subsequent visual examinations of X159 (a Mark A-19A type of subassembly containing mixed-oxide fuel), 11 of 19 shroud tubes were found fully or partially severed. Several of the capsules within their shroud tubes were distinctly kinked at axial locations near those at which the shroud tubes were severed. The examination also disclosed that the shroud-tube fractures occurred during reactor operations.
Contributing Partner: UNT Libraries Government Documents Department
Noise Pollution from Expressways

Noise Pollution from Expressways

Date: June 1976
Creator: Vaughan, Roger J. & Huckins, Larry
Description: This paper provides an economic analysis of three noise abatement strategies designed to interrupt the path of noise between highways and residential areas, and makes some abatement policy suggestions.
Contributing Partner: UNT Libraries Government Documents Department
An Implicit Three-Dimensional Finite-Element Formulation for the Nonlinear Structural Response of Reactor Components

An Implicit Three-Dimensional Finite-Element Formulation for the Nonlinear Structural Response of Reactor Components

Date: July 1976
Creator: Kulak, R. F. & Belytschko, Ted
Description: Report describing the formulation of a finite-element procedure for the implicit transient and static analysis of plate/shell-type structure sin three-dimensional space. It includes a development of the analysis, sample results, a summary, and related appendices.
Contributing Partner: UNT Libraries Government Documents Department
Investigation of Reactivity Anomalies in EBR-II

Investigation of Reactivity Anomalies in EBR-II

Date: June 1976
Creator: Walters, L. C.; Cutforth, D. S.; Forehand, H. M.; Hudman, G. D.; Larson, H. A.; MacFarlane, H. F. et al.
Description: A data-collection and advisory team was formed to investigate observations of power reactivity decrement (PRD) and reactivity loss rate (RLR) obtained during EBR-II reactor run 74, because both the PRD and RLR were judged to be high during that run. This report describes the efforts to develop a realistic model explaining the reactivity observations for run 74 and presents recommendations for additional diagnostic information in the event of a recurrence of off-normal behavior of reactivity.
Contributing Partner: UNT Libraries Government Documents Department
One-Dimensional Cladding-Relocation Model for Fast-Reactor Loss-of-Flow Accidents

One-Dimensional Cladding-Relocation Model for Fast-Reactor Loss-of-Flow Accidents

Date: March 1976
Creator: Ishii, M.; Chen, W. L. & Grolmes, M. A.
Description: The motion and location of the molten-cladding during an unprotected loss-of-flow accident in liquid metal fast breeder reactors are important because of the effects on the reactivity and the subsequent fuel motion. The present study analyzes the cladding-relocation problem based on a single-channel film-flow model and a simple thermal transient model for fuel pins. The motion of molten cladding induced by sodium-vapor streaming undergoes initial rapid upward acceleration, slowing down, flow reversal, and eventual slumping down into liquid sodium at the lower end of the heated section. Freezing of the molten cladding at the unheated upper plenum region is possible; bottom freezing and blockage formation were also included in the analysis. A simple calculation has been made for the R-series seven-pin tests in the TREAT reactor. The agreement of the overall physical behavior of the cladding motion with the post-test observations is quite satisfactory.
Contributing Partner: UNT Libraries Government Documents Department
Reactor Physics Studies in the Engineering Mockup Critical Assembly of the Fast Test Reactor

Reactor Physics Studies in the Engineering Mockup Critical Assembly of the Fast Test Reactor

Date: July 1976
Creator: Pond, R. B.
Description: Reactor physics studies in the Engineering Mockup Critical (EMC) assembly of the Fast Test Reactor (FTR) facility are reported. The study included measurements of the neutron spectrum, Doppler effect, sodium-void worth, reaction rates, subassembly worths, material replacement worths, and FTR control, safety and shim rod worths. Each of these physics studies were made in a clean plutonium (low-Pu-240) fuel composition environment and a dirty plutonium (high-Pu-240) fuel composition environment. The fuel studies were in support of determining the attendant effects of operation and safety of utilizing Light Water Reactor (LWR) plutonium fuel in the FTR. Comparison of the measured and calculated results are presented.
Contributing Partner: UNT Libraries Government Documents Department
Simulation Test Approach to the Evaluation and Comparison of Unconstrained Nonlinear Optimization Algorithms

Simulation Test Approach to the Evaluation and Comparison of Unconstrained Nonlinear Optimization Algorithms

Date: 1976
Creator: Hillstrom, Kenneth. E.
Description: A simulation test technique was developed to evaluate and compare unconstrained nonlinear optimization computer algorithms. Descriptions of the test technique, test problems, computer algorithms tested, and test results are provided.
Contributing Partner: UNT Libraries Government Documents Department
Use of Krypton-85 for the Detection of Pinhole Failures in GCFR Cladding

Use of Krypton-85 for the Detection of Pinhole Failures in GCFR Cladding

Date: May 1976
Creator: Yaggee, F. L.; Purohit, A. & Poeppel, R. B.
Description: Radioactive krypton-85 is used as a tracer to detect pinhole failures in GCFR cladding. High-purity helium (99.99% pure) that contains 0.3 ppm krypton-85 is used to pressurize the tubular test specimens, and a Geiger-Mueller counter is used to detect the krypton-85 in the helium environmental gas as it leaves the test chamber. Under the least favorable conditions of temperature and specimen pressure, it is estimated that the smallest pinhole failure that could be detected within 60 sec would have an orifice diameter of 0.0102 cm. Using lead shielding around the Geiger-Muller counter to reduce background radiation, the electronics associated with the krypton-85 detector will terminate a biaxial creep test at krypton-85 activity levels above 20 counts/minute.
Contributing Partner: UNT Libraries Government Documents Department
Comparison of the AMDAHL 470V/6 and the IBM 370/195 Using Benchmarks

Comparison of the AMDAHL 470V/6 and the IBM 370/195 Using Benchmarks

Date: March 1976
Creator: Snider, D. R.; Midlock, J. L.; Hinds, A. R. & Engert, D. E.
Description: Six groups of jobs were run on the IBM 370/195 at the Applied Mathematics Division (AMD) of Argonne National Laboratory using the current production versions of OS/MVT 21.7 and ASP 3.1. The same jobs were then run on an AMDAHL 470V/6 at the AMDAHL manufacturing facilities in Sunnyvale, California, using the identical operating systems. Performances of the two machines are compared. Differences in the configurations were minimized. The memory size on each machine was the same, all software which had an impact on run times was the same, and the I/O configurations were as similar as possible. This allowed the comparison to be based on the relative performance of the two CPU's. As part of the studies preliminary to the acquisition of the IBM 195 in 1972, two of the groups of jobs had been run on a CDC 7600 by CDC personnel in Arden Hills, Minnesota, on an IBM 360/195 by IBM personnel in Poughkeepsie, New York, and on the AMD 360/50/75 production system in June, 1971.
Contributing Partner: UNT Libraries Government Documents Department