This document provides a discussion of activities at the Hanford Works during 1951.

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A study of the density of aqueous uranyl solutions is described which was had as its primary purpose the development of an analytical method for the determination of uranium in relatively dilute solutions of this salt. These solutions contain trace amounts of contaminating elements. The presence of small amounts of free sulfuric acid and moderate variations in the temperature at which density measurements are made can be compensated for by the use of equations provided for the calculation of uranium concentration.

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Isotopes of americium and curium with mass numbers less than 242 have been produced by cyclotron bombardment techniques, and several of their nuclear properties have been investigated. The partial alpha half-lives of Am{sup 239}, Cm{sup 241}, and Cm{sup 240} and the partial half-life for spontaneous fission of Cm{sup 240} were measured. The alpha decay daughter of Cm{sup 238} was found and evidence for the discovery of Am{sup 237} (an {approx}1 hour electron capture activity) and Cm{sup 239} (an {approx}10 hour electron capture activity) has been presented. An Appendix indicating the conditions for separation of the plus three actinides by selective elution from ion exchange resin with citric acid has been included.

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A kinetic study of the accumulation of C{sup 14} in the intermediates of steady state photosynthesis in C{sup 14}O{sub 2} provides information regarding the sequence of reactions involved. The work described applied the radio-chromatographic technique for analysis of the labeled early products. The simultaneous carboxylation reaction resulting in malic acid as well as phosphoglycerate is demonstrated in experiments at high light intensity. A comparison of radioactivities in a number of phosphorylated sugars as a function of time reveals concurrent synthesis of fructose and sedoheptulose phosphates followed by that of ribulose phosphates and later by that of glucose phosphates. The possibility that the cleavage of C{sub 4} compounds to C{sub 2} carbon dioxide acceptors may involve C{sub 7} and C{sub 5} sugars and evidence for this mechanism is presented.

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Presented are 36 papers of the proceedings which-are concerned with the production of beryllium and zirconium, the physical properties and alloys of uranium, fuel element fabrication, metallurgy of thorium and zirconium, structures of metals, and general physical metallurgy. (B.O.G.)

Process design information concerning equipment and operation of a plant to produce UF/sub 4/ from UO/sub 3/ is presented. Included are process flow diagrams, drawings of ventilation and dust control systems, and vent gas systenas. Equipment lists and estimated utilities are also included as well as a description of the process. (J.R.D.)

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This purpose of this document is to summarize the existing or contemplated limits of C Pile power level and to recommend the rates of increase of power toward these limits during initial operation. In this report pile power level and limits are expressed in terms of tube power only.

Temperature variations in a slug create problems in stresses, corrosion, and design. As an acid in solving these problems for present and higher power levels, the temperature distribution and anticipated maximum temperatures have been calculated and are presented here. They are based upon theoretical investigations of heat flow in a four inch standard slug. The results of these investigations are presented in this document.

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Structures are subjected to a 50-kt blast, in order to obtain fundamental data on structures subjected to blast loading, to observe the response of the structures under this loading, and to determine the relative blast-resistance merits of several structural types. Modes of failure are determined. Shaped structures are found to be superdor to rectangular structures. Earth cover for the structures is also found to increase the blast resistance. It is found that standard Navy heavy bomb-proof structures with modifications can withstand a near-surface atomic burst at ground zero. (T.F.H.)

The purpose of this report is to specify the water flow rates and pressures which must be maintained at the process unit immediately following a Bonneville electrical power failure.

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