Operations with the Geothermal Loop Experimental Facility are reviewed. Inspection of the separators, scrubbers, pumps, valves, and controls is described. (MHR)

Strain-gaged flat plates having one, two, three, and five closely spaced holes were tested under uniaxial and 1:1 biaxial loading conditions. The experimental results of these tests were compared with corresponding calculated values obtained using the computer program TABLES, which was developed at Battelle-Columbus Laboratories. The study was conducted (1) to obtain highly reliable experimental data that can be used in the design of penetrations in vessels having large radii of curvature, (2) to evaluate the capability of the computer program TABLES for accurately predicting the stresses in perforated flat plates, (3) to complete the initial step leading toward the planned development of a method of analysis for clusters of nozzles attached to pressure vessels, and (4) to investigate the stress states in regions of closely space holes. The comparisons of calculated and experimental stresses were in good agreement, and the method of analysis was found to be capable of accurately predicting the complex state of stress in the vicinity of the closely spaced holes.

Most of this report is concerned with Study 4, ''Development of Accelerated and Abbreviated Testing Methods for Predicting Performance of Encapsulation Materials Over a 20-Year Lifetime.'' The outputs of the study are to be (1) the specification of a methodology for developing the experimental designs for aging tests, and (2) the development of the experimental designs for aging tests for selected materials and material interfaces. Pursuant to these goals, the aging behavior of polymeric materials has been reviewed to lead to identifying possible failure mechanisms and thus to appropriate choices of characteristics to be measured and stresses to be used in accelerated/abbreviated tests. A similar review has been made for glasses. The results are discussed. Aging data and data analysis methods (models) which have been used in other investigations have been identified and critiqued; these results are presented. Initial results of efforts on developing the methodology are also presented in the discussion. (WDM)

Polymers prepared by autoclave heat treatment of simple hydrocarbons were evaluated as sources of synthetic pitches for use in fabricating composite carbons. Hydrocarbons included: indene, phenanthrene, triphenylbenzene, 1,4-diphenyl-1,3-butadiyne, and cinnamylideneindene. Autoclave temperatures and pressures were in the ranges of 340 to 515/sup 0/C and 5 to 28 MPa, respectively. The more promising pitch materials were liquids or low-melting solids with coke yields of approximately 50 weight percent. Binary mixtures of organics were able to produce polymers and resulting carbons with properties that were correlated to the composition of the organic blend, thus allowing the controlled modification of properties.

Equipment and procedures used to spot weld tantalum- or stainless-steel-sheathed thermocouples to the inside diameter of Zircaloy tubing to meet the requirements of the Multirod Burst Test (MRBT) Program at ORNL are described. Spot welding and oxide cleaning tools were fabricated to remove the oxide coating on the Zircaloy tubing at local areas and spot weld four thermocouples separated circumferentially by 90/sup 0/ at any axial distribution desired. It was found necessary to apply a nickel coating to stainless-steel-sheathed thermocouples to obtain acceptable welds. The material and shape of the inner electrode and resistance between inner and outer electrodes were found to be critical parameters in obtaining acceptable welds.

This paper describes three proposed experiments for observing the breakdown of parity in atomic transitions due to the exchange of neutral, parity-violating currents arising from some of the new gauge models (e.g., the Weinberg model) for the weak interaction. The experiments are based on exploiting a suggestion, by Bouchiat and Bouchiat, that modern laser technology be utilized to produce intense, monochromatic, and polarized photon beams with which to excite forbidden atomic transitions of the basic form parallel ns/sup 1///sub 2/ broken bracket ..-->.. parallel n's/sup 1///sub 2/ broken bracket. The asymmetries (of the order of 10/sup -4/) in the de-exitation processes then signal the presence of the parity-violating components due to the neutral currents. In all three experiments suggested here, the use of multiple (uncollimated)atomic beams as targets forms a basic part, and their advantages over a temperature-equilibrium vapor are described. The first experiment uses /sup 55/Cs atomic beams as a target; the second uses /sup 37/Rb in conjunction with a superstrong magnetic field (approximately 80 kG); the third uses /sup 81/Tl and requires frequency doubling of the exciting laser beam. All three experiments appear to be quite feasible, and, given the requisite equipment (much of which is or soon …

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The objective of this research program is to investigate the technical and economic feasibility of producing solar-cell quality sheet silicon by dip-coating one surface of carbonized ceramic substrates with a thin layer of large-grain polycrystalline silicon. Of the various substrate materials dip-coated this reporting period, mullite appears, at this time, to best satisfy the requirements of this research program. Dip-coating experiments continue to demonstrate that layer thickness and grain size are dependent on and can be controlled by pulling rate and melt temperature. Crystalline grains as large as 1 mm wide and 2 cm or more long can consistently be grown in layers 35 to 50 ..mu.. meters thick. (WDM)

This report is about Social Services under the Social Security Act and the Past, Present, Proposed.

This report is a history of qui tam actions and citizen enforcement of these laws.

Molecular beam techniques were used to study the reactive and non-reactive scattering of the nitrogen positive ion from hydrogen isotopes and helium, at energies above the stability limit for spectator stripping. Reactive scattering was observed from H/sub 2/ and HD targets. Non-reactive scattering was observed from H/sub 2/ and D/sub 2/ targets, and from He at one energy. A correlation diagram for the system is presented and compared with the available a priori calculations. Two surfaces are expected to lead to reaction. One is a /sup 3/A/sub 2/ - /sup 3/PI surface, the other, a /sup 3/B/sub 1/ - /sup 3/..sigma../sup -/ surface. Collinear approaches are expected to be most reactive on the /sup 3/B/sub 1/ - /sup 3/..sigma../sup -/ surface; noncollinear, on the /sup 3/A/sub 1/ - /sup 3/PI surface. Theoretical models are presented in which an incident hard sphere A, representing the projectile ion, strikes one of a pair of hard spheres B-C representing the B hydrogen molecule. After an impulsive A-B collision, an impulsive B-C collision may take place. The relative energy of A to B is then examined, and a reactive event is considered to have occurred if the energy is less than the dissociation energy …