Acoustic emission monitoring augments other nondestructive testing methods and is sometimes applicable when other tests cannot be applied. This is, in part, due to the high sensitivity of acoustic emission monitoring. Acoustic emission monitoring is only sensitive to active flaw-growth, however, and will not detect a flaw in equilibrium. This paper describes the application of acoustic emission monitoring to nuclear reactor fuel pin end closure welds and other weldments of the reactor piping.

This compendium presents data on geothermal resources for all those western states with geothermal potential. Individual sections, which have been processed separately for inclusion in the EDB data base, are devoted to each of the following states: Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming. A separate section is also devoted to the U.S. Bureau of Reclamation Imperial Valley Project. Maps and references are included for each section. (JGB)

Nine papers are included. Individual papers were previously indexed for EDB. (MHR)

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Estimates are made of United States resources of coal, petroleum liquids, natural gas, uranium, geothermal energy, and oil from oil shale. Accuracy of the estimates probably ranges from 20 to 50 percent for identified-recoverable resources to about an order of magnitude for undiscovered-submarginal resources. The total cost resource base in the United States is estimated to be about 3,200 billion tons, of which 200 to 390 billion tons can be considered in the category identified and recoverable. It is estimated that the total resource base for petroleum liquids is about 2,900 billion barrels, of which 52 billion barrels is identified and recoverable. Of the total resource base, some 600 billion barrels is in Alaska or offshore from Alaska, 1,500 billion barrels is offshore from the United States, and 1,300 billion barrels is onshore in the conterminous United States. Identified-recoverable resources of petroleum liquids corresponding to these geographic units are 11, 6, and 36 billion barrels, respectively. The total natural gas resource of the United States is estimated to be about 6,600 trillion cubic feet, of which 290 trillion cubic feet is identified and recoverable. Uranium resources in conventional deposits, where uranium is the major product, are estimated at 1,600,000 tons …

This book is an outgrowth of activities of the Benchmark Problem Committee of the Mathematics and Computation Division of the American Nuclear Society.

The newtron energy spectrum of a Po-Be (alpha, n) source was measured as part of an intercomparison of newtron energy spectral measurements sponsored by Oak Ridge National Laboratory. Intensity maxima for neutron energies > 1 MeV were seen at or near 1.4, 2.1, 3.1, 5.0, 6.7, 7.7 and 9.7 MeV.

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The nature of two simultaneous processes is analyzed in detail. It is found that the experimental activation enthalpy increases with temperature for parallel processes and decreases with temperature for consecutive processes. Similarly the activation volume increases with pressure for consecutive processes and decreases with pressure for parallel processes. The creep rate stress exponent increases with stress for parallel processes and decreases with stress for consecutive processes. Each activation parameter is the weighted average of the corresponding ones for the individual processes. Several ways are indicated for the determination of individual activation parameters. The nature of three and four simultaneous processes is discussed briefly. When several processes are operating simultaneously, one of them may be rate controlling under certain conditions. This rate-controlling process may change with deformation parameters and a transition'' can be defined. The relation between transition parameters and the construction of deformation mechenism diagrams are also discussed. (auth)

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From European conference on irradiation embrittlement and creep in fuel cladding and core components; London, UK (9 Nov Theoretical models for the deformation of metals subjected simultaneously to external loads and fast-neutron irradiation are discussed. The following models have been analyzed in detail: dislocation climb; climb controlled glide; and nucleation, growth, and unfaulting of dislocation loops. It is shown that the strains produced only by the climb of dislocations are equal to the isotropic swelling strains plus the thermal creep strains due to climb of dislocations. No irradiation-induced creep results from the climb of dislocations or growth of loops. The climb controlled glide of dislocations is a viable irradiation creep mechanism for low fluences at all temperatures or for all fluences at high temperatures. At low temperatures the hardening occurs by the elastic interaction of loops and dislocations. It is shown that the climb controlled glide of dislocations through the loop structure can explain the transient irradiation creep behavior. Steady-state creep, however, at low temperatures is explained by the stressaffected nucleation of dislocation loops. Comparison of the theoretical prediction with the experimental results suggests that stress not only influences the orientation of the loop nuclei but also enhances the interstitial …

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From 11th international symposium on free radicals; Berchtesgaden, F.R. Germany (4 Sep 1973). The results of a preliminary study of the interactions of positronium with nitrobenzene and ontho, meta, and para derivatives of nitrotoluene and dinitrobenzene in benzene solutions are reported. Distinct differences in the rate constants for the reaction of positronium with the organic molecules were observed for the various systems, and an attempt was made to correlate these changes to certain molecular parameters and to the effects of steric interactions in these molecules. (JFP)

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From symposium on noble gases; Las Vegas, Nevada, USA (24 Sep 1973). Exposures of rats, mice, and hamsters for 90 hours per week to radon daughters nanging from 2000 to 8500 WL, with and without 18 mu g per liter uranium ore dust, caused marked lifeshortening in all three species. Marked reduction in body weights occurred in all three species, with weight losses of 30 to 50% of control animal values in all species after 31/2 months of exposures. Mice exposed to radon daughters and ore dust were particularly susceptible in terms of mortality, although the lungs of these animals showed very little pathological change. Classical radiation pneumonitis with alveolar septal fibrosis and occasional bronchiolar epithelial hyperplasia were the predominant deep lung lesions seen in all species. In contrast to hamsters exposed 30 hours per week to 1200 WL of radon daughters and uranium ore dust, proportionately more of the pathology was seen in the upper respiratory tracts of the hamsters in the present study. The contrast between markedly affected trachea and major bronchi vs. relatively little effects in deep lung was most evident in rats. Findings of severe suppurative laryngitis and bronchitis were frequent in rats, and may have …

A new absolute pressure measurement system based on the simultaneous measurement of length and ultrasonic transit times is described. The system was used to determine the transition pressure of pure mercury at 0 deg C at 7571.2 plus or minus 1.6 bars. It is particularly advantageous to use a device for calibrating secondary gauges such as manganin gauges inasmuch as it gives a highly accurate measurement of nonlinearities in such secondary gages. The gage calibrated in the present study reaches a maximum deviation from linearity of 11.6 bars at a pressure midway between atmospheric pressure and the 0 deg C mercury melting pressure. (auth)

Extensive studies of the structure and phase transformations of high field superconductors of the BETA -tungsten type were made. A phase transformation was discovered at 43 deg K in Nb/sub 3/Sn and the structure of the low temperature phase was measured. The details of the transformation in terms of the formation of the low temperature tetragonal phase from the high temperature cubic phase was investigated both by x-ray observations and optical microscopy below 40 deg K. The complete phonon dispersion of vanadium was measured by x-ray diffuse scattering, thus complementing the neutron measurements on other body-centered cubic elements. Incidental to the work on phonons in vanadium a strong effect was discovered which was related to hydrogen precipitations in vanadium. In separate electron microscopy studies the structure of the vanadium hydride phase was determined directly and the relative positions of the hydrogen atoms were determined. In a neutron diffraction study complementing the phonon work with x-rays the existence of anharmonic vibrations in single crystals of silicon was shown directly by determining, for the first time, a nuclear forbidden reflection. This reflection is due solely to anharmonic vibration of the nucleus of the atom and it was shown that its intensity increases …

The significance of retardation effects in photon emissions and absorption is emphasized in the calculation of self-energy. It is explicitly demonstrated that inclusion of such effects leads to a finite answer for the shifts of atomic energy levels in a nonrelativistic theory without cutoff. Ambiguities that exist in the mass renormalization in the non-relativistic approach are pointed out. Such ambiguities vanish from the relativistic theory. Explicit calculation is carried out in the case of hydrogen by utilizing the Coulomb Green's function. The advantage of the present approach in calculating self-energy shift in high Z hydrogenic ions is suggested. (auth)

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