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15 MeV neutron damage in Cu and Nb

Description: An investigation was made of high-energy neutron damage in Cu and Nb irradiated with approximately 15 MeV neutrons at the Oak Ridge Isochronous Cyclotron. The neutrons were generated by bombarding a thick Be target with 40- MeV deuterons resulting in a high energy neutron spectrum broadly peaked at 15 MeV. Single crystals of Cu and Nb were irradiated at room temperature to fluences of approximately 2 x 10$sup 17$ n/cm$sup 2$. The resulting loop-type defect clusters in the crystals were characte… more
Date: January 1, 1975
Creator: Roberto, J. B.; Narayan, J. & Saltmarsh, M. J.
Item Type: Refine your search to only Article
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100 mg $sup 251$Cf activation analysis facility at the Savannah River Laboratory

Description: The $sup 252$Cf Activation Analysis Facility at the Savannah River Laboratory (SRL) is used routinely for multielement analyses of a wide variety of solid and liquid samples (e.g., metal alloys, fly ash and other airborne particles, rocks, and aqueous and nonaqueous solutions). An automated absolute activation analysis technique, developed to use neutron transport codes to calculate multienergy group neutron spectra and fluxes, converts counting data directly into elemental concentrations expre… more
Date: January 1, 1975
Creator: MacMurdo, K. W. & Bowman, W. W.
Item Type: Refine your search to only Article
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120 kA pulsed dc power system with computerized thyristor triggering

Description: A pulsed dc power system provides 120 kA excitation current for the ORMAK toroidal field coils. A drive potential of 1000 volts brings the coils up to full current in about 0.5 seconds. Constant current is maintained for 0.25 seconds, then approximately 20 x 10$sup 6$ joules of stored energy is dumped in a free-wheeling diode and resistance network. The power system contains 8 each, 30 kA, 500 V thyristor controlled dc power modules in a series/parallel combination. A control computer generates… more
Date: January 1, 1975
Creator: Mosko, S. W.; Bates, D. D.; Bigelow, R. R.; Cottongim, E. K.; Pipes, E. W. & Sueker, K.
Item Type: Refine your search to only Article
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200 kW, 800 MHz transmitter system for lower hybrid heating

Description: This paper describes a new rf heating system which has just been completed and is now operational on the ATC machine. The system utilizes four UHF TV klystrons to generate at least 200 kW of power at a frequency of 800 MHz. Pulse widths can be varied from 20 $mu$sec up to 20 msec. A radar type floating deck modulator along with photo-optical transmitting and receiving devices have been incorporated into the system to provide the pulse fidelity and versatility which characterizes this equipment.… more
Date: January 1, 1975
Creator: Deitz, A.
Item Type: Refine your search to only Article
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A 218 neutron group master cross section library for criticality safety studies

Description: The AMPX system was used to generate a P$sub 3$ 218 neutron group master cross-section library from ENDF/B-IV data for the fuel, structural, and neutron- absorbing materials tabulated. The library is the data base for the generation of broad-group cross sections for shipping cask calculations and other criticality safety analyses using codes such as KENO and ANISN. Selection of the fine-group energy structure for the 3-eV to 20-MeV energy range included consideration of the resonance structure … more
Date: January 1, 1975
Creator: Ford, W. E., III; Westfall, R. M. & Webster, C. C.
Item Type: Refine your search to only Article
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16th Annual Report

Description: The ACIR Library is composed of publications that study the interactions between different levels of government. This document is an annual report.
Date: January 1975
Creator: United States. Advisory Commission on Intergovernmental Relations.
Item Type: Refine your search to only Book
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239Pu Contamination in Snakes Inhabiting the Rocky Flats Plant Site

Description: For approximately four years studies have been under way at the Rocky Flats plant to determine contamination patterns and concentrations of Pu in the biota. Contamination of the Rocky Flats environs has resulted from at least three incidents, a September 1957 fire, a May 1969 fire, and leaking barrels containing plutonium-laden cutting oil. The latter incident was considered by far the major source of the plutonium contamination. Results are reported from a study conducted to determine whether … more
Date: January 1, 1975
Creator: Geiger, R. A. & Winsor, T. F.
Item Type: Refine your search to only Report
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Absolute measurement of the critical scattering cross section in cobalt

Description: Small-angle neutron scattering techniques have been used to study the angular distribution of the critical scattering from cobalt above T/sub c/. These measurements have been put on an absolute scale by calibrating the critical scattering directly against the nuclear incoherent scattering from cobalt. In this way the interaction range r$sub 1$, which appears in the classical and modified Ornstein--Zernike expressions for the asymptotic form of the spin pair correlation function and is related t… more
Date: January 1, 1975
Creator: Glinka, C. J.; Minkiewicz, V. J. & Passell, L.
Item Type: Refine your search to only Article
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Acceleration techniques for response matrix methods

Description: Application of the power iteration method to the multigroup response matrix equations reduces them to a series of one-group problems. Applying acceleration techniques to each of these monoenergetic problems results in substantial reductions in computational effort. The use of point over-relaxation methods in the solution of these equations is described. Over-relaxation is also applied to the outer-iteration eigenvalue and source estimations with considerable success. 10 references. (auth)
Date: January 1, 1975
Creator: Sicilian, J. M. & Pryor, R. J.
Item Type: Refine your search to only Article
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Acoustic detection of momentum transfer during the abrupt transition from a laminar to a turbulent atmospheric boundary layer

Description: Acoustic sounder measurements of a vertical profile of the abrupt transition from a laminar to a turbulent atmospheric boundary layer were compared with meteorological measurements made at 10 m and 137 m on an instrumented tower. Sounder data show that conditions necessary for onset of the momentum burst phenomenon exist sometime during a clear afternoon when heat flux changes sign and the planetary surface cools. Under these conditions, the lowest part of the atmospheric boundary layer becomes… more
Date: January 1, 1975
Creator: Schubert, J. F.
Item Type: Refine your search to only Article
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Acoustic emission from thermal-gradient cracks in UO$sub 2$

Description: A feasibility study has been conducted to evaluate the potential use of acoustic emission to monitor thermal-shock damage in direct electrical heating of UO$sub 2$ pellets. In the apparatus used for the present tests, two acoustic- emission sensors were placed on extensions of the upper and lower electrical feedthroughs. Commercially available equipment was used to accumulate acoustic- emission data. The accumulation of events displayed on a cathode-ray-tube screen indicates the total number of… more
Date: January 1, 1975
Creator: Kennedy, C. R.; Kupperman, D. S. & Wrona, B. J.
Item Type: Refine your search to only Article
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Acquisition of the ANL 4-MeV Electrostatic Accelerator. Progress Report, September 1, 1974--August 31, 1975

Description: The operation of the ANL 4-MeV accelerator for the reporting period September 1, 1974 through August 31, 1975 is described. Some improvements and modifications to the accelerator and associated equipment are reported, and activities on the three research projects are summarized. An outline of work for the next reporting period indicates a shift from the BYU 2-MeV accelerator to the 4-MeV accelerator to take advantage of the higher beam energy. (auth)
Date: January 1, 1975
Creator: Dixon, D. R. & Hill, M. W.
Item Type: Refine your search to only Report
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Advanced geothermal primary heat exchanger (APEX). Quarterly progress report Q-1, 1 July 1975-30 September 1975

Description: The major effort during this reporting period was directed toward performing the analytical design task and initiating the laboratory setup for the self-cleaning heat exchanger concept. Analytical design includes the selection of a suitable demonstration site, water chemistry and temperature, and thermodynamic power cycle, and parametric design and sensitivity analysis of a heat exchanger suitable for a 10 MW electric proof of concept plant. (MHR)
Date: January 1, 1975
Creator: Addoms, J.F. & Schoenman, L.
Item Type: Refine your search to only Report
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Advanced geothermal primary heat exchanger (APEX). Quarterly progress report Q-2, 1 October 1975-31 December 1975

Description: The APEX program is designed to investigate the concept that a continuously recirculating flow of fine solid particles in the brine stream will substantially retard the formation of scale in the primary heat exchanger. The primary technical effort during this reporting period has been the buildup of the test facility. Some preliminary testing has been conducted in order to establish process equipment suitability prior to completing the test facility design. Fouling experiments have also been co… more
Date: January 1, 1975
Creator: Addoms, J.F.
Item Type: Refine your search to only Report
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Advanced thermionic energy conversion. Progress report, September 1, 1974--August 31, 1975

Description: During this reporting period the characteristics of several types of advanced thermionic energy converters were explored, both analytically and experimentally. Two new converter test vehicles were developed and two test stands and a controlled-atmosphere converter processing station were completed for use in the experimental program. Our previous understanding of pulsed converters was confirmed experimentally, and the work of earlier investigators concerning the inert gas ignited triode was sub… more
Date: January 1, 1975
Item Type: Refine your search to only Report
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