Faceting of high angle grain boundaries in SIGMA = 3 and SIGMA = 5 coincidence lattices of the fcc structure was studied using thinfilm bicrystal specimens of controlled geometry. A number of relatively high index boundaries in the coincidence lattices (containing relatively low planar densities of coincidence sites) was found to break up into low energy facets corresponding to low index planes of the coincidence lattices (containing high densities of coincidence lattice sites). These results are consistent with a general expectation that the grain boundary energy decreases as the planar density of coincidence sites increases, i.e., the two-dimensional periodicity of the boundary becomes shorter, and long-ranged distortions are reduced. (auth)

There are numerous reasons for performing environmental measurements for routine health or safety monitoring and to determine the movement of trace elements or radionuclides through our environment to man. This is often a requirement for the licensing of nuclear power reactors, as well as many other meteorological or environmental research experiments. In this paper a variety of sensitive low-level counting systems are discussed from an analyst's viewpoint, centering on a variety of Nal(Tl) and Ge(Li) gamma ray spectrometers. The coincident gamma-ray emitters are most sensitively detected through NaI(Tl) multidimensional gamma ray spectrometry, while single gamma ray emitters are very sensitively detected with Ge(Li) detector systems. NaI(Tl) detector systems are superior in general for environmental measurements. (auth)

>Progress reported includes preparation and tensile properties of Pt-Rh-- W alloys, oxidation of Ir, and effects of 0/sub 2/ and CO on tensile properties of T-111 and TZM. (DLC)

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This report is intended as a User's Manual for SWAN''--- a code written for perturbation theory analysis and optimization of the nucleonic characteristics of fusion reactor blankets. SWAN is also applicable to any problem described by the inhomogeneous linear transport equation, e.g., radiation shield problems. The optimization method is based on variational techniques. The variables of the optimization are material densities, with no restriction on their number. One joint restraint may be imposed in addition to upper and lower limits on each density. The parameter to be extremized and the restraint may be either a weighttype (linear) or nucleonic (bilinear) functional. The transport calculations for SWAN are performed with the one-dimensional discrete-ordinate code ANISN. (auth)

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From seminar on high-energy accelerator science; Tokyo and Tsukuba, Japan (5 Nov 1973). Parameters for the PEP (Proton-- Electron-- Positron) colliding beam facility and the status of the proposed facility are outlined. - The design study has been a joint effort by SLAC and LBL. (WHK)

ABS>From symposium on fuel and elements for fast reactors; Brussels. Belgium (2 Jul 1973). Developmental programs aimed at fabrication of stainless steelclad PuO/sub 2/ fuel pins are described. Information and data are included on welding fast reactor fuel cans, methods of reducing the incidence of weld cracking, effects of weld stresses, and fuel plug design. (JRD)

From third international corference on atomic collisions in solids; Gatlinburg, Tennessee, USA (23 Sep 1973). Focused sequences of replacement collisions have been studied, especially in association with radiation damage cascades. Radiation-damage events are simulated using a computer program based on binary collision approximations. The results are averaged over a complete set of initial directions of the primary knock-on atom for each primary energy to obtain quantities of physical interest for which the effects of replacement sequences may be made explicit. The calculations are compared with recent experimental results. (auth)

A description is given of an out-of-pile experiment which simulated fission-gas release in current-design uranium-oxide fuel subassemblies of liquid- metal-cooled fast breeder reactors (LMFBR's) and which was performed to evaluate the potential for pin-to-pin failure propagation due to thermal transients induced in adjacent fuel pins. A sodium-cooled test section containing three electrically heated pins was used. Gas (angon or xenon), injected as a jet through a needle protruding into the flow cross-sectional area of the test section, was made to impinge on one of the heater pins. Data are presented regarding the measured cladding-temperature rise and the calculated local heat- transfer coefficient in the impingement area, with the following parameters: gas type, needle internal diameter, heat flux, coolant flow rate, gas-plenum pressure and temperature, and axial location with respect to the gas jet. The cladding- temperature rises measured represent upper values, since the conditions under which they were obtained are conservative. There are two reasons for this: (a) The gasrelease rates correspond to those that would prevail if the internal resistance to the flow of gas, between the gas plenum and the point of release of the fuel pin, were negligibly small; (b) the tests were performed under steady- state …

ABS>Research is being conducted at Brookhaven National Laboratory to develop a superconducting ac cable system leading to the construction of a 1/2 mile model cable of 200 MVA capacity at Brookhaven and a cable of larger (>2000 MVA) capacity for test at a utility testing site. It is a coaxial cable of flexible design using Nb/sub 3/Sn superconductor, and a tape wound dielectric, helium impregnated, of a material yet to be determined. The research development is reported on the dielectric materials, cryogenic enclosure, refrigeration, and superconducting materials. (MCW)

A successful method of screening high-dielectric-constant, nonmagnetic, high-loss-factor materials at microwave frequencies was developed to provide material control by incoming inspection. This is accomplished by measuring the S parameters of the material---reliance on the manufacturer's permittivity data and x-ray examination for voids and inclusions is no longer necessary. Use of an automatic network analyzer makes 100% inspection economically feasible. (auth)

The overall risk evaluation for various radioactive waste management concepts includes calculation of radiation doses to individuals and local populations. Radiation doses are the most appropriate measure of the consequences of unforeseen releases of radioactive materials to the environment and dose criteria are available by which the severity may be judged. A comprehensive dose computational model, developed and used for other Atomic Energy Commission studies, has been adopted to improve its flexibility and to assist in evaluating alternative means for disposal of high-level waste. Typical input terms for normal use include source terms (radionuclide release rates to man's immediate environment) and dilution factors. Outputs include individual pathway doses and total doses to maximum individuals for both an urban and a rural population. Whole-body doses plus doses to other critical organs are obtained, as well as the fractional dose contributions of individual nuclides. Doses for one year or total doses for fifty years of exposure are available. Although all of the many factors and assumptions used can be changed if desired, listings of those currently being used are given. Factors used are for the most part from recognized sources, supplemented by local data and assumptions as necessary. For doses to individuals, …

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Results have been obtained from initial experiments designed to study high-voltage breakdown under conditions of importance to the design of direct- collection units. A coaxial configuration was used to mock-up critical fields near grid wires. With appropriate heat conditioning, fields as high as 9.6 x 10/ sup 5/ V/cm were maintained at the surface of a 7-mil-diam tungsten wire. This represents an enhanced field of ~10/sup 8/V/cm at whisker'' sites. Breakdown criteria are proposed for three regimes; initial, field-emission, and ultimate, which differ by the amount of prior conditioning applied to the wire. Additional considerations of importance to direct collectors such as the effect of thermionic emission and ion bombardment are discussed. (auth)

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The dosimetry for a person exposed to a large cloud of /sup 85/Kr, supposed to be uniformly distributed in air, is considered. Methods are described that are general, and will also apply to exposure to an infinite cloud of other noble gases. Computer calculations are used for estimates of dose in an anthropomorphic phantom. The decay scheme of /sup 85/Kr which is taken from MIRD Pamphlet No. 6 is included. There is only one photon and its intensity is only 0.41% per disintegration. (auth)

From international symposium on thermal expansion of solids; Lake of the Czarks, Missouri, USA (7 Nov 1973). A quartz differential dilatometer was interfaced with a Digital Equipment Corporation PDP-8 computer to automatically measure the thermal expansion of solids from 300 to 1000 K. A Carson-Dice Electronic-Mechanicai Micrometer, readable to 2.5 x 10/sup -6/ cm, was employed for length-change measurements accurate to 2.5 x 10/sup -5/ cm. Calibrated Pt/Pt/ sub 90/Rh/sub 10/ thermocouples were used to measure temperature changes to plus or minus 0.22 K. The software and hardware necessary to completely automate the measurements are described. Measurements on National Bureau of Standards certified quartz, tungsten, and copper specimens demonstrated an accuracy of plus or minus 1.5% in determination of the coefficient of thermal expansion. (auth)

Preliminary results are presented from calculations concerning the kinetics and transport of a single SST exhaust plume. Curves are shown that exhibit the effect of different transport rates on axis ozone concentration and total ozone destruction per unit plume length. (auth)

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The United Aircraft Research Laboratories are engaged in a program to investigate the use of a dense, mirror-confined, laser-produced plasma as the target for a neutral-injection beam and to examine this technique for establishing and maintaining a high-temperature, high-density, steady-state, mirrorconfined fusion plasma. The program is a direct extension of the current UARL investigations of the capture and confinement of laser-produced plasmas in a minimum-B mirror field. The overall program plan of the UARL Laser-Initiated Target Experiment involves four parts. The first of these is the laser heating of a solid particle positioned within the experiment chamber by an ultrahigh- vacuum suspension system to create a filly ionized plasma of ~10/sup 16/ to 10/ sup 17/ ions and electrons at a temperature of 0.5 to 1 keV. The second part of the program is the capture and confinement of the high-temperature laser-produced plasma to form a stable, high-density (>10/sup13/ cm/sup -3/), mirror-confined target plasma which fills an appreciable fraction of the mirror field volume. Heating of the confined-target plasma to ~10 keV by charge-exchange interaction with an injected energetic neutral beam comprises the third part of the program, and the fourth is the creation of a collisional, steady-state, mirror-confined plasma …

Much of what is presented here is indicative of our national trends in computing. To review and bring in the international scope at the same time, the following points are enumerated: 1. There are but few new ventures in the competition for the high performance end of the computer market. 2. The competition for the middle range of computers is very great internationally. 3. The number and varieties of minicomputers are growing at a phenomenal rate throughout the world. There is no question but that the number of manufacturers and number of systems built will continue to accelerate for some time to come. 4. In all these systems, because of rapid price decreases, memory size will increase. 5. Software is becoming more complex and will continue to do so. Most systems will be based on existing systems. 6. Peripherals will improve in performance at lower cost, but will remain of the same magnetic variety in large measure. 7. Networks are in'' today and probably will remain so for quite some time in the broad sense of the word. Computer utilities are a long way off---if every they materialize. (LMT)

The proposed multiparticle spectrometer is designed to study particles produced at small angles (0.5 < theta < 20 mr). It is assumed to be part of a larger set-up, where the larger angles are covered by other spectrometers, or at least a 4 pi detector, such as described by Arnold et al. (CRISP 72-65). The general layout consists of 4 magnets in a symmetrical arrangement. A set of proportional chambers downstream from the first set of magnets can measure both angle and momentum. Using a second pair of magnets, the momenta can be re- combined. Then all tracks will point back to the original interaction point in compact bundle, which may be suitable for particle identification by Cherenkov counters further downstream. (auth)

The implosion-heating power supply uses four 125-kV generators in series. Each generator consists of a fast 125-kV pulse-forming network made up of capacitors attached to a 1m-wide parallel-plate transmission line which is fed through multiple cables from a 2.5- mu F, 0.5- mu H Marx bank charged to 180 kV. To simplify construction it was decided to do without oil or water for high- voltage insulation and grading. The developments described here are: (1) a low- inductance connection between the 125-kV capacitors and the parallel-plate transmission line using an elastomer gasket capable of holding 200 kV; (2) edge flashover prevention by ballooning'' the sheet insulation, by which a 10-cm edge extension of insulation is capable of withstanding a 200-kV pulse for several microseconds; (3) using the edge flashover for over-voltage prevention; (4) grading of voltage along insulators with conducting plastic sheets to prevent flashover at the load switches and cable connections; and (51 capacitively graded insulating supports for the Marx banks. (auth)