This memorandum discussed review of the data from tests using alum in the treatment of pile process water, and using activated silica as a coagulant aid during period of low water temperature, which shows that this method should be substituted for the present method of treating pile process water in all 100 Areas. It was recommended that the water treatment procedures and specifications attached to this memorandum be initiated as standard practice in all 100 Areas as soon as it is possible to make the necessary equipment modifications and installations.

Plutonium turnings formed in the machining operation are processed by recycling them to the reduction operation. The turnings are here combined in the radiation charge to form a button with the plutonium from the reduction of the fluoride. Occasionally an inventory of turning will accumulate, especially when a number of machined pieces are recycled to be recast. Since the amount of turnings to plutonium in plutonium fluoride considered safe for reduction is a maximum ratio of 1.35, a high turnings inventory can only be expended at a limited rate. Briquetting offers a convenient way of depleting the turnings inventory in a rapid manner. A total of twenty-four briquettes were pressed. Eight castings were made by casting three briquettes into a form suitable for further processing. Six of the eight castings were accepted at final inspection. One was too small to machine due to an interrupted heating cycle and the other was recast after two coating failures with subsequent stripping caused the piece to be out of specifications in size. Castings made from briquettes were comparable with those made from buttons in parity, homogeneity of the alloy, and lack of voids. Skulls from the casting of briquettes varied form 10 to …

The purpose of this specification is to set forth in a single document a coherent set of requirements as affected by interrelated design and operating conditions. Basic values, dimensions, and other parameters fundamental to establishment of design specifications for the individual reactor components are given. This document will eventually become a part of the complete ``Design Specifications for ``X`` Reactor`` to be issued later. At that time some of the information given here (such as the moderator dimensions) will appear elsewhere in the document and therefore there is some duplication. Such information was necessary to give the complete scope. An attempt is made to give the basis or background at the end of the document. All references pertinent to the choice are probably not included.

This report consists of a graph which plots the minimum requirements for the pressure at the top of riser after an electrical power failure verses time after the electrical power failure. Pressure is expressed in pounds per square inch. Points for shutdown of maximum operation and normal operation are given.

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A manual for supervisory personnel to aid in formulating detailed instructions for operators and foremen employed in a green salt plant is given. A description of the processsteps in plant operation is contained. (C.J.G.)

To one whose responsibility it is to make evaluations of the degree of hazard existing in the radiation field of a nuclear accelerator or a nuclear reactor, the valid estimate of the contribution of neutrons to such a field is of considerable importance. The degree of difficulty of such a measurement depends strongly upon the information desired - whether (1) simply the presence of 'slow' and 'fast' neutrons in significant numbers is in question, or (2) a measure of flux densities within known energy intervals is required, or (3) a direct estimate of the specific rate of energy absorption due to neutron-produced effects in a given medium is desired. The importance of securing trustworthy estimates of the neutron field can be appreciated by recalling that the biological damage due to a given amount of ionization produced in biological tissue by effects due to neutrons is estimated to be several times the damage due to a similar amount of ionization produced by X-rays or gamma rays. This 'relative biological effectiveness' must be evaluated by carefully controlled animal experiments. Its value appears to range from about 2.5 for slow neutrons to abount 10 for fast and high energy neutrons. Of course the …

Physical data are presented for transverse CSF samples with capsule exposures of 568, 1049, and 1617 MD/CT. The higher exposures indicate a sharper damage gradient toward the front of the pile. Additional casings of various types of graphite were loaded into test holes during this month. Average values of the thermal conductivity and electrical resistivity for several types of virgin graphites are presented. Data of this nature will be a regular portion of this report henceforth. Process tube channel 2677-H was mined and traversed for bore diameter. Although several of the tube block junctions were obscured, the channel was quite uniform. Examination of all previously mined graphite powder samples for aluminum oxide corrosion product has been completed and the results are reported.

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