The Al-rich corner of the ternary alloy system Al-- Th-U has been investigated by thermal and microscopic The creep properties of annealed Zircaloy- 2, Zircaloy3, and 15% cold-worked Zircaloy-2 at elevated temperatures were determined. The metallurgical bond formed between electropolished U and Zr cladding by hydrostatic pressing is being evaluated. Oxidation data are given for Nb and Nb alloys in dry air at various temperatures. A study of the phase relationships which occur between the please delete the above abstract===================== analyses to determine an area of low-melting alloys that could be used as a liquid metal fuel in U/sup 233/ breeder reactors. A phase diagram of this Al-rich corner of the system has been proposed. The data indicate that the binary eutectic valleys from the Al-- U and Al--Th systems meet at a point in the neighborhood of the composition of 76 wt.% Al, 18 wt.% Th, and 6 wt.% U to give a ternary eutectic which solidifies at 630 deg C. Although microstructures indicate two different primary phases as required, a third binary valley leading to this ternary eutectic has not been established. Results of the investigation show that there is a rather wide range of compositions of U …

This report talks about Argonne 7.7- Meter Bent Crystal Ganna- Ray Spectrometer

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When nuclear reactions occur in atoms in molecules chemical changes follow as a result of the recoil of the product atoms. The nature of these chemical changes was studied intensively for a number of systems but in most cases the magnitude of the recoil energy was about the same. In the present studies use was made of a much greater recoil energy than that normally used. The reaction Br( gamma ,n)Br* gives a recoil bromine atom with an energy of the order of 10/sup 5/ ev, compared to 10/sup 2/ ev for the product of the Br(n, gamma )Br* reaction which is ususlly used. The chemical nature of the products resulting when the propyl bromides were irradiated with neutrons and 70-Mev gamma rays was studied by established techniques. It is possible to differentiate between the reactions which occur while the recoiling bromine atom still is highly energetic, or hot,'' and those which occur after it has been slowed down to thermal energies. The products of the hot reactions show little dependence on the intial recoil energy. In the case of the thermal reactions, the higher energy recoil produces a greater number of products which are different from the original molecules. …

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The decay heat removal system of the PWR is described. (T.R.H.)

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Kilogram quantities of delta-stabilized and pure plutonium turnings can be cast directly into ingots of normal quality with high yields. This report describes the equipment and process used.

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Using a high speed JOHNNLLC computer and a program which allows the solution of the partial differertial equations governing hydrodynamic motion in spherical geometry, the problem of the blast wave from a point source in air was carried out. The methods are described and the equation of state for air is given. The results of the particular solution for a point source is covered, giving shock values of pressure, density, particle velocity, temperature and dynamic pressure as functions of the shock radius and of the peak overpressure. The time histories of the same variables are given for a number of distances from the source, as well as values of the durations of positive phases and impulses from overpressure and from dynamic pressure. (auth)

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A report about a study of the effect of irradiation on the thermal conductivity of uranium.

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Results are compiled from a series of experimental tests of three types of propellants for reactor safety fuses and various configurations of the fuse. Compressed gas, explosive gases, and solid chemical propellants are discussed; the latter proved to be the best. A symmetrical annular fuse configuration was found to be best when compared with the offset type, the supportedrupture-disk type, and the GE-ANPD original developmental type fuse. (auth)

A correction factor to apply to the macroscopic absorption cross section of U/sup 238/ in the resonance region for a heterogeneous hydrogen-moderated reactor is derived and used in a sample calculation. (M.H.R.)

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Attached to this report is a letter from Raymond R. Schiff, containing pertinent information, dated Jan. 28, 1957. 2p. (WAPD-S5W-NA-1451. The input for the program includes radial and axiai power distributions and rules for combining them into three-dimensional power distributions, radially and axially variable local peaking factors, engineering hot channel factors, and geometrical data. The output consists of the average inlet and outlet temperatures for each pass, the maximum relative heat flux, outlet temperature, surface temperature, and normal channel temperature rise in each pass together with the location of each of these maxima and the heat flux distribution in each channel where one of the maxima occurs. The program allows very rapid evaluation of these quantities and permits calculation without the simplifying approximations usually involved in hand methods. The program was successfully applied to S5W problems and requires from 3 to 5 minutes of machine time for solution of a full-scale case. (M.H.R.)