The selection of the design criteria for evaluation of the structural integrity of the MSG as modified for Na-H/sub 2/O reation testing is presented.

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For superconducting rf separators, assembled by electron beam welding techniques, two types of mode stabilizers are discussed: the elliptical structure, and a new design called the eccentric structure''. For an operating pi /2 or pi mode in the lower pass band, it is shown that the various parameters of the eccentric structure can be adjusted to provide the required frequency spacing between the operating mode and the upper dispersion curve. (auth)

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Only one resource type is presently being used to produce power in the U. S.--dry steam generating 400 MWe at The Geysers near Santa Rosa, California. Six other types --brines at high temperature and low salinity, high temperature and high salinity, low temperature and low salinity, and in geopressured reservoirs, plus dry hot rock at shallow depth and in deep, normal-gradient formations -- are potentially available for economic energy recovery. The program plan calls for a government budgetary obligation of million during FY-75 coupled with an industrial commitment of .7 million. The five-year budgetary obligations are estimated to be 5 million for the government and million for industry. The complete five-year plan plus the balance-to-complete funds is presented. Under this program plan, demonstration plants using four of the six advanced resource types will be completed and operated, jointly with industry, to obtain engineering and economic data. Construction work will be underway on a demonstration plant for a fifth resource type, dry hot rock, and engineering data in support of the design of a sixth plant employing normal- gradient fermations will have been collected. It is expected that information from all these systems will accelerate commercialization of geothermal energy. (auth)

A comparison of the hazards involved in the existing process and the electrolytic process for dissolving plutonium metal shows that, in the opinion of the review team, no net increase in hazards will occur by operating the electrolytic dissolvers. This new process eliminates several hazardous operations such as metal burning and PuO/sub 2/ powder handling, and reduces operator time and, therefore, exposure. The new facility can be operated safely provided that the recommendations given previously are implemented.

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The choice of the beam-beam tune shift for one interaction region (the beam-beam limit) is discussed. The effect of multiple crossings is then included. Bccause of radiation damping for electrons, these considerations are quite different for protons and electrons. Both are treated. (auth)

The search for the correct higher symmetry of decay vertices is discussed. It is noted that something higher than SU(3) is certainly valid and colliding lepton beams can help find what it is. SU(6(/sub W/ and its limitations, L = 1, 2 mesons, and the two-photon processes e/sup +/ + e/sup -/ yields e/sup +/ + e/sup -/ + hadrons, and e/sup -/ + e/sup -/ yields e/sup -/ + e/sup -/ + hadrons are considered. (JFP)

Results from calculations using a 2021-energy-group cross section library with sufficient energy definition in the lower energy range to resolve the known resorances in /sup 239/Pu and /sup 235/U are compared with flat-plate resorance self-shielding experimental data. The results are somewhat ambiguous. The lower energy ranges appear to agree better with experimental data for small areal densities, but disagree more as the areal density increases. (20 figures) (RWR)

Tensile properties of bare-rolled ingot-sheet beryllium from room temperature to 800 deg C are reported. While strength values show a steady decrease above room temperature, tensile elongations exhibit peaks at approximately 300 and 700 deg C. The strainhardening exponent varies with temperature and amount of strain, and ranges between approximately 0.10 and 0.26. Metallographic examinations reveal cleavage fracture at the lower temperatures, accompanied by severe grain deformation above room temperature. This is followed by a temperature range in which ductile rupture occurs, and finally, at the higher temperatures, grainboundary failure. The low BeO content of this material and the post-rolling heat treatment given to the sheet are factors which improve the high-temperature ductility as compared to other grades of beryllium. (auth)

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From international metallography society symposium on specimen preparation for metallography; Los Angeles. California, USA (23 Sep 1973). A triode cathodic vacuum etcher has been developed that has a number of advantages over conventional diode etchers. The triode etcher can be operated at specimen voltages well below 1000 V(dc) to minimize mount deterioration and the danger of arcing to the etched surface. Etching voltage and current density can be independently varied so that high current densities can be used with low voltages to provide rapid etching rates while minimizing heating of the specimen. Also. redeposition of sputtered material on the etched surface is reduced because of the low operating pressure (<3 millitorr) of the triode system. At very low voltages (75 to 125 V(dc)) the etching rate is relatively insensitive to crystalline orientation and a polishing action is obtained. This permits the removal of deformed surface layers and even such gross surface defects as the scratches from 600-grit paper without producing significant surface relief. This ion polishing capability has been used to reveal the pore structure of UO/sub 2/ and UO/sub 2/-PuO/sub -specimens by removing surface flow material without enlarging the pores. Details of the design and operation of a simple, …

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Recent TART Monte Carlo calculations have shown discrepancies with F number measurements, as well as with measurements of fission density in /sup 235/ U and /sup 239/PU plates. These discrepancies have been attributed to the fact that the group-averaged TART cross sections cannot properly treat resorance self- shielding effects, because the width of TART groups is large compared with the width of cross-section resonances. This report attempts to explain the observed discrepancies with the help of a simplified cross-section model. Some of the results are plotted. The present TART cross-section group widths are also shown superimposed on a plot of /sup 239/Pu and /sup 235/U fission cross sections. It can be seen that the code will underpredict, overpredict, or correctly predict the fission density, depending on the thickness of fissiorable material previously traversed by the neutron flux. Underprediction is almost certainly present in TART F number calculations for some LLL devices that have thick layers of fissiorable material. The correct prediction on the front surface, followed by overprediction and then followed by a correct prediction; has been measured in a recent F number experiment. (7 figures) (RWR)