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From abstract: "The probability for a fission neutron to escape fast leakage from bare, hydrogen moderated reactors is calculated by a method utilizing only the microscopic cross section of the materials. These results can be employed to determine the effectiveness of other substances in preventing fast neutron leakage. These calculations are carried out for aluminum and iron."

The 100-C project is to be located adjacent to the present 100-P Area. It is planned to build an addition to the present 181-B River Pump House using the same elevations for pump settings, intakes, and floors as for the present pump house, thus maintaining the same suction conditions and flood protection as B Area. The 105 Building will be located on higher ground than B Area and, therefore, protection against possible flood damage is assured.

From introduction: "This paper employs a multigroup method similar to that of J. S. Story, AERE-TR-177 to calculate, for cylindrical geometry, that heat energy source density in graphite due to absorption and Compton scattering of those gammas produced by neutron capture in a water filled cadmium control rod."

The 100-C project is to be located adjacent to the present 100-B Area. It is planned to build an addition to the present 181-B river pump house using the same elevations for pump settings, intakes, and floors as for the present pump house, thus maintaining the same suction conditions and flood protection as B Area. The 105 Building will be located on higher ground than B Area and therefore, protection against possible flood damage is assured. This report is divided into the following sections: (1) general description of project; (2) addition to existing river pump house; (3) raw water lines from 181-B addition to 183-C lead house; (4) the 183-C filter plant; (5) 190-C process pump house; (6) power house addition; (7) high tanks; (8) retention basins; (9) outside streamlines; (10) primary substation; (11) outside underground lines; (12) outside electric lines; (13) roads, railroads, walks, fences; (14) structural design of all buildings; and (15) architectural design of all buildings.

Summary: A study has been made of possible processes for the production of hafnium-free zirconium of a grade suitable to meet AEC specifications.

This memorandum discusses investigations concerning the coupling step required to adapt a Redox IIBP to a 234-5 feed which have indicated that a single peroxide strike from a solution 50--60 g./1. in product and about 2 M in nitric acid is adequate. Additional work is planned to demonstrate both peroxide and Pu(IV) oxalate strikes under these conditions. The present Redox PR cage product contains 10 g./1. in product and over 500 g./1. in nitric acid, and probably requires tow peroxide strikes; in addition, the operating capacity of the PR cage may be inadequate to process the throughputs desired in the Redox plant. A two stage continuous concentration process for Redox IIBP is jointly suggested by Design and Development and Chemical Development personnel, and is described in this document. This process is believed to be simple and easily operable. Acid is removed from the product solution adequately for the single peroxide strike coupling procedure. Batch size appears to be easily controllable.

Report documenting the suitability of Ohio for plant locations to produce synthetic liquid fuels, based on raw materials, water sources, and local interest

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"A simple apparatus particularly applicable to the determination of the corrosive effects of flowing liquid metals on structural materials is described. In this apparatus, flow of the liquid medium at known velocities may be induced in toroidal shaped channels fabricated from the test structural material only, with no pump, valves, or flow meter required. A circulating velocity of 25 ft/sec has been obtained in preliminary tests and no basic limitation on increasing the speed was encountered" (p. 1).

Report presenting an investigation of a wing-body combination with a plane triangular wing of aspect ratio 4 and 3-percent-thick rounded nose sections in streamwise planes at subsonic and supersonic Mach numbers. Lift, drag, and pitching moment are presented for a range of Mach and Reynolds numbers.

Report presenting buffet boundaries, buffeting-load increments for the stabilizers and elevators, and buffeting bending-moment increments for the stabilizers and wings for a jet-powered bomber airplane equipped with reflexed flaps and ailerons and tail-tip-incidence changes.

Report presenting the results of pressure-distribution and force tests on four wings at Mach number 6.86 and Reynolds number 980,000 in the 11-inch hypersonic tunnel. Characteristics of the wings tested included a 4-inch square plan form, a 5-percent maximum thickness, and diamond, half-diamond, wedge, and half-circular-arc sections. Information about pressure measurements, wing characteristics, and Schlieren photographs is provided.

Report discussing the division of load among the wing, fuselage, and tail for several aircraft configurations at subsonic and supersonic speeds. The load that each component carries at various Mach numbers and angles of attack is described.

Report discussing an investigation to determine the aerodynamic characteristics of a model of a tailless delta-wing airplane configuration with a leading edge swept back 60 degrees at a range of Mach numbers. Information about lift-curve slope, buffeting, drag rise, hinge-moment coefficients, transonic trim, and stability is provided.

"Forced-convection heat-transfer data have been obtained for water flowing in an electrically heated tube of circular cross section at water pressures of 200 and 2000 pounds per square inch, and temperatures in the nonboiling region, for water velocities ranging between 5 and 25 feet per second. The results indicate that conventional correlations can be used to predict heat-transfer coefficients for water at pressures up to 2000 pounds per square inch and temperatures in the nonboiling region" (p. 1).

"A camera designed for use in flight has been developed by the NACA Lewis laboratory to photograph cloud droplets in their natural suspension in the atmosphere. A magnification of 32 times is employed to distinguish for measurement purposes all sizes of droplets greater than 5 microns in diameter. Photographs can be taken at flight speeds up to 150 miles per hour at 5-second intervals, A field area of 0.025 square inch is photographed on 7-inch-width roll film accommodating 40 exposures on an 18-foot length" (p. 1).

Report presents the results of sound measurements at static conditions made for a two-blade 47-inch-diameter propeller in the tip Mach number range 0.75 to 1.30. For comparison, spectrums have been obtained at both subsonic and supersonic tip speeds. In addition, the measured data are compared with calculations by the theory of Gutin which has previously been found adequate for predicting the sound at subsonic tip speeds. Curves are presented from which the maximum over-all noise levels in free space may be estimated if the power, tip Mach number, and distance are known.

Increases in production rates in the 100 Areas have caused a demand for additional amounts of cooling water for process use. Consequently, continual efforts have been made to push the existing filter plants well beyond designed capacity. The latest and most successful effort was made at the 100-B filter plant during the spring of 1951. Tests of the 100-B Area indicate that the 100 Area filters can be operated safety at 3,400 GPM per unit, or 13.3% beyond the designed capacity, during the period of most difficult water treatment (February-June). By extrapolation of the data to the most favorable water treatment periods (August--January), it is indicated that net water available for production use is approximately 5% above 3400 GPM. It is recommended that no additional filter plant capacity be installed in existing areas until anticipated water loads exceed 3,400 GPM per filter basin unit. It is further recommended that an investigation be made of the feasibility of changing water flows to the piles on a seasonal basis to take advantage of the fact that the season requiring the greatest theoretical quantity of water (because of high raw water temperatures) is also the season during which it is easiest to produce …

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This memorandum discusses discusses the design of a new reactor area in relation to the H pile.

The functional operation of the flapper nozzle was tested by charging slugs through it while water flow rates up to 48.4 gpm and inlet header pressures up to 400 psig. were maintained. Comparative damage to the slugs by the flapper nozzle and an H-type inlet nozzle was determined by charging slugs through the nozzles with a 105-D type air cylinder charging machine under conditions of no water flow or lubrication. The effect of the nozzle design on the inlet pressure fluctuations was determined while using 0.140, 0.200, and 0.285 inlet orifices as well as no orifice. The flapper nozzles operated satisfactorily for all conditions tested, without leakage from the flapper valve or the needle valve. However, the flapper valve became loosened on the shaft after several operations, and it is felt that the design should be changed to insure that it is rigidly fastened to the shaft at all times. Damage to the slugs by either the flapper nozzle or the H-type inlet nozzle was negligible. The ribs of the process tube caused the normal parallel, longitudinal scratches the length of the slugs. Maximum fluctuations of {+-} 5 psig were noted on the inlet pressure gauge reading, at compared with …

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