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Selection of the reference concept for the surface examination stations in the fuels and materials examination facility

Description: The prototype surface examination station for the Fuels and Materials Examination Facility (FMEF) will use closed circuit television (CCTV) for routine modes of operation along with a nuclear periscope for special examination needs. The CCTV and the nuclear periscope were evaluated against prescribed station requirements and compared in a side-by-side demonstration. A quantitative evaluation of their outputs showed that both systems were capable of meeting surface anomaly detection requirements… more
Date: September 15, 1978
Creator: Frandsen, G. B. & Nash, C. R.
Partner: UNT Libraries Government Documents Department
open access

Analytical study of the dilation of fast reactor fuel assembly ducts

Description: An analytic method is presented for determining the dilation of fast reactor fuel assembly ducts. For temperatures where creep is linearly dependent on stress, the method is rigorous in satisfying equilibrium, compatibility and stress-strain equations. Solutions are presented for two cases: (1) a duct with constant pressure differential, (2) a duct with varying pressure differential. Results are in close agreement with finite element results of the MARC-CDC program. The method is used to predic… more
Date: November 15, 1978
Creator: Chan, D. P. & Jackson, R. J.
Partner: UNT Libraries Government Documents Department
open access

Pressure ionization in laser-fusion target simulation

Description: Accurate simulation of high density target implosion requires material properties (ionization, pressure, energy, opacity, and transport coefficients) at densities where bound electrons are significantly perturbed by neighboring atoms. In the LASNEX code, this data is supplied by tables and/or calculated from a Stromgren model for ionization equilibrium. Improvements have been made in this model which aim at assuring thermodynamic consistency and obtaining better agreement with more elaborate ca… more
Date: September 15, 1978
Creator: Zimmerman, G.B. & More, R.M.
Partner: UNT Libraries Government Documents Department
open access

High repetition rate burst-mode spark gap

Description: Results are presented on the design and testing of a pressurized gas blown spark gap switch capable of high repetition rates in a burst mode of operation. The switch parameters which have been achieved are as follows: 220-kV, 42-kA, a five pulse burst at 1-kHz, 12-ns risetime, 2-ns jitter at a pulse width of 50-ns.
Date: June 15, 1978
Creator: Faltens, A.; Reginato, L.; Hester, R.; Chesterman, A.; Cook, E.; Yokota, T. et al.
Partner: UNT Libraries Government Documents Department
open access

Motion of particles in a thermal boundary layer

Description: In the course of using laser Doppler velocimetry to study combustion in a thermal boundary layer, the particle count rate was found to decrease abruptly to zero inside the boundary layer. Experimental and theoretical investigation of this phenomenon was carried out. The motion of the particles may be due to the combined effects of thermophoresis and radiative heating.
Date: June 15, 1978
Creator: Schefer, R.W.; Agrawal, Y.; Cheng, R.K.; Robben, F. & Talbot, L.
Partner: UNT Libraries Government Documents Department
open access

Off-resonance transformer charging for 250-kV water Blumlein

Description: An off-resonance transformer for charging a 250-kV Blumlein system provides a viable alternative to other charging schemes by permitting the use of conventional thyratrons. Such a transformer must have reliability, a reasonable voltage step-up, and a non-reversing primary current. The analysis, design, and performance data for such a transformer are presented. The strong interrelationship between transformer design and Blumlein requirements necessitates that Blumlein description and design crit… more
Date: June 15, 1978
Creator: Cook, E. & Reginato, L.
Partner: UNT Libraries Government Documents Department
open access

Precision etching of thick-film circuits of aluminum and aluminum-0. 1 wt% copper

Description: In certain high-current applications the resistance of the aluminum conductors is an important design parameter. Such a case is the aluminum exploding-bridge used in some nuclear detonators. The resistance of the network must be accurately known so that the individual bridge will receive the proper firing current. Vapor-deposited, thick aluminum films (0.011 mm) are often used to produce the necessary circuitry. These films are suitably masked and etched to make the conductors. Conventional etc… more
Date: February 15, 1978
Creator: Wiesner, H.J.
Partner: UNT Libraries Government Documents Department
open access

Modeling vertical loads in pools resulting from fluid injection. [BWR]

Description: Table-top model experiments were performed to investigate pressure suppression pool dynamics effects due to a postulated loss-of-coolant accident (LOCA) for the Peachbottom Mark I boiling water reactor containment system. The results guided subsequent conduct of experiments in the /sup 1///sub 5/-scale facility and provided new insight into the vertical load function (VLF). Model experiments show an oscillatory VLF with the download typically double-spiked followed by a more gradual sinusoidal … more
Date: June 15, 1978
Creator: Lai, W. & McCauley, E.W.
Partner: UNT Libraries Government Documents Department
open access

Plasma neutron diagnostic techniques with good spatial and energy resolution

Description: A neutron-detection system has been assembled to provide both spatial and energy information from the neutrons produced in advanced fusion experiments. Techniques described are applicable to experiments where the neutron pulse is on the order of one-second duration. The system gives spatial resolution of about 1 cm at distances of 1 to 2 m and energy resolution of 0.6 MeV at 14 MeV. In all cases, pulse-shape discrimination is used to distinguish neutrons from gamma rays.
Date: September 15, 1978
Creator: Slaughter, D.R.
Partner: UNT Libraries Government Documents Department
open access

Modulator charging system upgrade for a 5-MeV electron accelerator

Description: The Lawrence Livermore Laboratory is currently constructing a new linear induction accelerator with a higher beam current than the Astron accelerator. The new accelerator, called the Experimental Test Accelerator (ETA) will be a 5-MeV, 10-kA accelerator with a pulse width of 50-ns. Like the Astron, the principle of magnetic induction is used to obtain a linear accelerator. The modular accelerating cavities form essentially a 1:1 transformer and the change in flux in the ferrite core induces an … more
Date: June 15, 1978
Creator: Rogers, D.; Dexter, W.; Myers, A.; Reginato, L. & Zimmerman, A.
Partner: UNT Libraries Government Documents Department
open access

Acoustic velocity measurement across the diameter of a liquid metal column

Description: Present techniques for measuring sound velocity in liquid metals have been limited by the use of transducers which cannot survive in extreme temperature conditions. These methods also require relatively long measurement times. An optical noncontacting method has been developed which may be used for extremely short experimental times and very high temperatures and pressures. This technique is being incorporated into an isobaric expansion apparatus in which a 1 mm diam wire sample in a high press… more
Date: May 15, 1978
Creator: Calder, C.A. & Wilcox, W.W.
Partner: UNT Libraries Government Documents Department
open access

Experimental test facility for evaluation of solar control strategies

Description: An experimental solar heating and cooling system has been constructed at LBL. It was designed to serve as a test system to check out the operation of an LBL-developed solar controller that looked promising in terms of its commercialization potential. Improvements were made in the experimental heating and cooling system to enable quantitative determination of the auxiliary energy savings made possible by using this type of controller. These improvements consisted of installation and calibration … more
Date: August 15, 1978
Creator: Majteles, M.; Lee, H.; Wahlig, M. & Warren, M.
Partner: UNT Libraries Government Documents Department
open access

Influence of organic matter on trace metal flux in coastal sediments. [Sequim Bay]

Description: These studies indicate that organic matter in coastal sediment constitutes a primary sink for trace metals, both at natural and amended levels. Organic substances are also involved in controlling the mobility and flux of trace metals from sediments. Further, organically-bound trace metals in sediments appear to be an important source to deposit-feeding organisms.
Date: May 15, 1978
Creator: Schmidt, R. L. & Gibson, C. I.
Partner: UNT Libraries Government Documents Department
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