Critical experiments are described, and the hazards attpendant to these experiments are evaluated for a reflector-controllped boiling-peterogeneous- reactor design. The proposed reactor design is water moderated and reflected. However, to provide maximum flexibility and safety, the critical asspembly is a thermal reactor moderated and reflected with plastic having appropriate voids to simulate water. A spection of the plastic reflector is movable to represent changes in the waterrelector level. The data obtained using this reflectorcontrolled assembly is then suppliped to an electronic reactor simulator which is connected to a full-scale mock-up of the proposed hydraulic control system. In this manner, thpe characteristics of thpe complete system are determined. The fuel-element assemblies are composed of strips of aluminum and Teflon-coated uranium sandwiched with plastic and pecased in aluminum boxes. One- half of the core is on a movable table, while the other half is on a fixed table. Primary control and safety of the asspembly is achieved by inserting or withdrawing sandwiched stainlpess steel-cadmium rpegulating and safety plates and by increasing or decreasing the distance between the two core halves. For safety, the maximum normal rate of reactivity addition has been limited to an pestimated 0.04 per cent per sec for control-rod …

This report analyzes the stability and feasibility of a reflector-control system for a boiling heterogeneous reactor.

Report issued by the Oak Ridge National Laboratory discussing semiannual progress made by the Physics Division. Descriptions of progress and studies conducted are presented. This report includes tables, and illustrations.

Report issued by the Oak Ridge National Laboratory discussing progress made by the Stable Isotopes Division. Descriptions of of the progress and studies made are presented. This report includes tables, illustrations, and photographs.

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Lewis in 1929 determined the thermal conductivity of beryllium metal for the first time. The next measurement reported in the open literature on the thermal conductivity of beryllium was by Powell in 1953. Measurements were also made by Grenell, Linebrink, and Johnson at Battelle Memorial Institute in 1947. Their values are in good agreement with those of Powell.

Calculations are presented of the fast neutron dose rate, the gamma-ray dose rate, and the thermal neutron flux along the source plate axis in the Lid Tank with the tank filled entirely with water. These calculations are compared with experimental measurements. The calculations are absolute and are compared with absolute measurements.

The following memorandum is a selective bibliography of books, periodical articles, and technical reports relating to tritium with special reference to urine analysis of tritium and metabolic experiments.

Memorandum presenting a determination of the static lateral stability of six delta wings at subsonic speeds. In addition, two of the wings with 82.5 degree and 75 degree sweep of the leading edge were oscillated in yaw about the 50-percent point of the root chord in order to determine the effects of frequency and amplitude on the combination lateral stability derivatives resulting from the motion. Results regarding the static characteristics and oscillatory characteristics are provided.

Report presenting an investigation to determine the control hinge-moment characteristics at two Mach numbers for a series of 18 controls, including the effects of various tabs and fences, on a 60 degree delta wing. Testing covered a range of angles of attack, control deflection, and tab deflection. Results regarding the basic variation of hinge-moment coefficients, tip controls, and trailing-edge controls are provided.

Report presenting detailed blade-element-performance plots for a high-flow transonic inlet rotor. Information provided includes the effects of Mach number, blade loading, and angle of attack on element performance is provided.

Report presenting an investigation at Mach numbers from 0.6 to 1.28 to determine the drag characteristics of a series of conical afterbodies with a cold sonic jet issuing from the base. Models investigated had boattail angles from 3 to 45 degrees, ratios of jet diameter to base diameter of 0.65 and 0.75, and values of the ratios of the base diameter to maximum diameter of 0.55, 0.70, and 0.85. Results regarding afterbody pressure distributions and afterbody drag are provided.

Report discussing a project to determine a high-energy fuel suitable for turbojet-powered aircraft. Components of the project include thermal and combustion properties, experiments with combustors using boron compounds, evaluation of boron fuels in full-scale turbojets with and without afterburners, and boron fuel use in ramjet flights. The most promising fuel found in the report is pentaborane.

Report presenting NACA work through 1954 on a high-energy fuel suitable for turbojet-powered aircraft. The work includes thermal and combustion properties, experiments with combustors designed to use boron compounds, evaluation of boron fuels in full-scale turbojets with and without afterburners, and ramjet flights on boron fuels. Satisfactory combustion of pentabornae and high-concentration blends of pentaborane has been demonstrated in a turbojet, an afterburner, and a ram jet.

From Introduction: "An extension of the work presented in reference 2, the method was applied to six swept-wing airplanes for which the pilot opinion was well documented. The analytical results obtained are used herein to illustrate how wind-tunnel data may be used to predict the pitching motions and the comparative pitch-up behavior of new airplane designs or to assess the effects of modifications on existing airplanes."

The following report provides data taken of problematic situations that have led to accidental prompt-critical radiation bursts in critical assemblies laboratories, as well as a few risky instances. The purpose of this report is to prevent these mistakes from happening in the future.

Report presenting an experimental investigation of the cooling characteristics of a small air-cooled turbine blade for use in a turboprop engine in a static cascade facility. Three test blades of the same size and chord were tested at several different combustion-gas temperatures. Results regarding the gas-flow conditions in cascade test section, correlation of temperature data and application of correlated data to typical engine are provided.

Memorandum presenting an experimental investigation of the cooling characteristics of a small air-cooled turbine blade for use in a turboprop engine in a static cascade facility. Three test blades were studiued at three combustion-gas temperatures. Results regarding gas-flow conditions in cascade test section, correlation of temperature data, and application of correlated data to the typical engine are provided.

Abstract: "A measurement was made of the dissociation of vibrationally-excited H2+ ions by photons having quantum energy in the vicinity of 4 e.v. The calculated cross section from theory is 3 x 10-(-18) cm-2. The experimental result is 10-(-17) cm-2; a factor of 10 uncertainty is present because the photon intensity was unknown by that factor."

Report presenting an experimental investigation in a simulated afterburner test rig to determine the effects of some configuration variations on afterburner combustion performance. Results regarding the reduced-diameter flameholder, inclined radial-gutter flameholder, tapered-shell afterburner, and turbulence generators are provided.

Memorandum presenting an experimental investigation conducted in a 25.75-inch-diameter simulated-afterburner test rig to determine the effects of some configuration variations on afterburner combustion performance. The variations included a V-gutter flameholder with the maximum gutter-ring diameter reduced from 20 to 17 inches, but with equal projected blockage; an inclined radial-gutter flameholder; a tapered-shell afterburner; and a V-gutter flameholder with turbulence generators added.

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The purpose of this memorandum is to outline the high temperature hydride moderator program proposed for the.Metallurgy Division. The objectives of this program are (1) to provide physical and mechanical property data required by the reactor designers, (2) to develop methods for fabricating moderator assemblies, and (3) to devise.and conduct tests to evaluate these· assemblies. The requirements in each of these areas and the work proposed to meet them are outlined.

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