This is a personal letter to Kenneth Davis, AEC, concerning ORNL reactor activities. Topics covered include: HRP status; the gas-cooled system; molten fluorides; the ANP project; and maritime work.

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Ames Lab. Studies of Nb--U alloys, phase studies of the U----Z--system and the solubility of U in Zn, are summarized. Argonne National Lab. Phase studies of C -- U systems and Nb--U alloys, the effects of radiation on Mo--U alloys, corrosion and irradiatron of Sr--U systems and Nb--U--Zr alloys are reported. Battelle Memorial lnst. The stabrlit.v and existence range of the intermediate epsilon phase, heat treatment, and radiation damage of U--Zr alloys were investigated. A study of the physrcal properties of Mo--U alloys, U alloys for slug-type fuel elements, low-melting U alloys for reactor fuels is presented. The preparation of Al--U alloys is outlined, and corrosion studies of U--Zr alloys were made. Hanford Atomic Products Operation. A series of experiments covering the testing of irradiated U alloys and the transformation kinetics of Si- -U systems were initiated. Knolls Atomic Power Lab. Irradiation stability and the equilibrium phase diagram of U--Zr alloys, and fission gas diffusion in Al--U alloys are being investigated. National Bureau of Standards. A brief summary of the work on Pt--U alloys is given. Nuclear Metals, Inc. Cladding of unalloyed U with either Zr or zircaloy by coextrusion and the preparation of Si--U systems were reported. Sylvania Electric …

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Argonne National Lab. Annealing experiments of highpurity C --U alloys in the gamma region in an Ar atmosphere show that the metal is subject to decarbinization. Fourteen binary U--Pd alloys were prepared and examined. Pd solubility in gamma U is less than 1 wt.% at 890 deg C. Seventeen binary alloys of U-Ru were prepared and examined in the as-cast condition. The corrosion resistance after irradiation of U--Si alloys was tested. Homogeneous U- -Ta alloys have not been obtained. Th-rich U alloys were found to be more stable under irradiation than the best U alloys. The effect of heat treatment on microstructure is being studied as part of the effort to understand the effect of alloying on corrosion resistance in Ti--U alloys. Crystal and corrosion studies on U--Zr alloys are reported. Armour Research Foundation. Small ternary additions were found to greatly affect the transformation characteristics of U-- Nb alloys, and a hardness change was noted for this alloy. Preliminary data for U--Nb--Zr alloy demonstrated a relationship between the strained matrix and the physical properties of the alloy. Battelle Memorial Institute. Phase relationships between the intermediate delta phases of the U--Mo and U--Ti systems were conducted. U--Zr, U--Mo, and U--Nb alloys …