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All foreseeable emergencies are adequately forestalled by installing in the reactor areas of the Savannah River Plant a number of pieces of auxiliary equipment. This precaution is taken in order to prevent permanent damage to the main equipment and to contain the radioactive material in the restricted areas of the plant. However, in the unlikely event of failure of some pieces of the main and/or auxiliary equipment, it is necessary that the operators take coordinated emergency action in order to prevent damage and hazard. In some cases swift action is called for. Because there are many pieces of equipment, all of which can conceivably be said to be subject to failure or faulty operation, one could postulate an astronomical number of failure incidents, each one different. But many of these would be highly improbable or call for the same emergency action. On the master incident sheet, Table 1, there are defined twenty such incidents, which represent a fair cross section of the possibilities. In compiling this table, the authors have kept in mind all of the worst reactor accidents that have occurred in the US and Canada and those minor equipment failures that have occurred at SRP before the startup …

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This document presents a summary of work and progress at the Hanford Engineer Works for October 1953. The report is divided into sections by department. A plant wide general summary is included at the beginning of the report, after which the departmental summaries begin. The Manufacturing Department reports plant statistics, and summaries for the Metal Preparation, Reactor and Separation sections. The Engineering Department`s section summaries work for the Technical, Design, and Project Sections. Costs for the various departments are presented in the Financial Department`s summary. The Medical, Radiological Sciences, Utilities and General Services. Employee and Public Relations, and Community Real Estate and Service departments have sections presenting their monthly statistics, work, progress, and summaries.

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This discussion will review the results of a survey of present plans for the Bevatron counting equipment. Proposed counting facilities, tentative specifications for desired counting equipment, a view of past counting techniques, and some of the later associated circuits will be considered.

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The mechanisms involved in fractionation as measured in samples obtained early from drone planes during the cloud rise or from manned aircraft a few hours later are discussed. A key problem in fractionation is the formation of the precipitate in the cloud, and an attcmpt is made to describe this mechanism. (W.D.M.)

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The thermal expansion of LiH was studied in the 0 temperature range of 25 to 525O C. by means of x-ray diffraction. The coefficients of linear expansion were determined a s a = 4.2 x 10 - 5 and f3 = 1.9 x 10 - 8 . There is no evidence of any structure transitions in this range. The 0 cell constant for LiH at, 25 C. is a. = 4.083A.

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A considerable technical effort has been expended during the past two years in evaluating the effects of various process water qualities on the corrosion of aluminum tubes and slugs. Primary emphasis has been placed on four types of water: ferric sulfate coagulated water with and without dichromate addition, and alum coagulated water with and without dichromate addition. Both in-pile and flow laboratory data have been obtained on the corrosivity of these several water qualities. It appears that a review of the available information will serve two useful purposes. First, a comparison of corrosion data from all available sources will provide a better overall understanding of the corrosive properties of the various types of water. Second, a knowledge of the applicability of small scale and mock-up tests to actual in-pile operating conditions will permit more efficient experimentation in current work aimed at raising outlet water temperatures, reducing water treatment costs, and reducing corrosion rates of pile components. The purpose of this report is to present a summary and correlation of flow laboratory and in-pile corrosion data in various qualities of process water.

The relative probabilities for alternate processes initiated by a nucleon-nucleon collision depend on the dynamics involved and on the volume in phase space accessible to each final state. According to Fermi this last aspect alone may be of decisive importance. Such an assignment would follow were an approximate statistical equilibrium reached. The volume occupied by the incident nucleons and the associated pion clouds will have very large energy density at the instant of collision. Knowing that the interactions of the pion fields are strong, Fermi assumes that this energy is suddenly distributed among the various degrees of freedom present in the interaction volume in accord with statistical laws. He then computes the statistical probability that a certain number of pions will be created with a given energy distribution. It is then assumed that the energy will rapidly dissolve and that the particles into which the energy has been converted will fly out in all directions. Fermi argues that this approach may give a fairly good approximation to the actual case; since the number of possible states of the given energy is large and the probability of establishing a state to its average statistical weight will be increased by the number …

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There are two different types of investigation of interest in high energy nuclear phenomena. One can observe gross effects such as the production of large numbers of heavy particles of different types, or one can study the elementary particles themselves which result from these collisions, for example, the kappa mesons, to determine modes of decay and the energy spectra of the resulting particles. This discussion will deal with the gross aspects of high energy interactions and will review the work of Fermi: High Energy Nuclear Interactions, Progress in Theoretical Physics, 5, No. 4, July-August, 1950.

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This report addresses the atomic energy commission division of reactor development information meeting.