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This report addresses the calibration of kerr cell system for high voltage pulse measurements.

This report summarizes effort conducted to determine the thermoelectric characteristics of materials currently utilized in the SNAP-32A and SNAP-21 thermoelectric couples.

This Conceptual Facility Design Description covers the site facilities which are classified in the three following general catagories: Grouncl improvements and Civil Engineering features Plant utility services Auxiliary structures exclusive of, and outside the reactor building complex, heat transport system building, and the containment structure. This CFDD describes all the FFTF utility services except electrical, which is covered in the Primary Electrical Power System and the Building Electrical Power System. Included are functions and design requirements, a physical description of the facility, safety considerations, principles of operation, and maintenance principles.

Declassified 30 Aug 1973. Recent analysis of the NERVA hot end support system revealed that the high with-grain (WG) thermal expansion and the high creep deformation of NRX-A6 NERVA-type 75 wt% niobium carbide -- 25 wt% graphite hot pressed composite material may not be entirely satisfactory in future designs. Design requirements have shown the need for a better match between the normally high average coefficient of thermal expansion ( alpha ) of the composite material and the fueled graphite. A manufacturing engineering program was initiated to investigate methods for reducing the difference in the coefficient of thermal expansion (CTE) between the fuel and the carbide composite and, in addition, methods for reducing the creep rate. These objectives were targeted to be accomplished on 75--25 wt% composite material. It was demonstrated that the coefficient of thermal expansion can be r by about 50 percent of the difference between the coefficient for fueled graphite and that for the NRX-A6 type of composite material without compositional changes. In addition, by a slight modification of the carbide-- graphite ratio, the process should permit the matching of the CTE of fueled graphite and composite material. Improvements can be accomplished by a compressive heat treatment process …

The memorandum presents a description of an electric furnace used to heal test specimens, and it describes furnace damage caused by electrical arcs when a breaking specimen suddenly opens the inductive circuit. The device, which is applicable to an d-c circuit, provides a gap containing a dielectric material in parallel with he device to be protected. The gap is set to break down at a volatge well below the safe operating voltage of the device to be protected. A high voltage suddenly impressed on the parallel combination causes arcing across the gap and places a short circuit across the protected device. The current flow through the arcing circuit prevents further build-up voltage a level that might damage the protected device.

This document presents details of the activities of Douglas United Nuclear at the Hanford site during the month of July 1968.

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The fire protection system for the FFTF is required for the safety of personnel and the protection of property. Included are functions and design requirements, a detailed description of the system, safety considerations, principles of operation, and maintenance principles.

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Declassified 28 Aug 1973. In an effort to understand the anomalous nonadherence of the NbC bore coatings on fueled ROVER elements, a modified microautoradiographic method was used to reveal the U distribution at the coating/ graphite interface. The method was used on elements manufactured with a reduced U content at the interface. Correlation between alpha tracks and the surrounding microstructure was excellent. Observations are consistent with the concept that uranium is responsible for an accelerated attack on the graphite during coating, although this is not explicitly proven. The presence of U in amounts below the detection limit of the method used is associated with tightly adherent NbC coatings. (auth)

The reaction pp {yields} {pi}{sup +}d resulting from the high energy cosmic rays incident on the interstellar hydrogen gas gives rise to secondary deuterons. Since the total cross section for this reaction is appreciable only at proton kinetic energies of 600 MeV, the deuterons have a very small spread in energy. It is estimated that the flux of deuterons from this mechanism should be easily discernible from deuterons produced by other reactions and copious enough to be detected at the earth. The narrow deuteron energy distribution could provide an energy calibration for the study of the existence of a postinjection acceleration.

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Brief summaries are presented on the following presentations: welding for low voltage operation, welding techniques at Mound, welding/joining at Sandia, Ultrasonic`s plastic assemblies of detonator components, laser welding bridge-wires, laser safety in the Biorad industrial environment, nondestructive testing at Mound, thermal cycle data and evaluation, thermal cycle nondestructive testing, corrosion of detonator electrode and bridge-wire, and corrosion studies and fabrication of bridge-wire at Sigmund Cohn.

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