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Analyses of data from the first series of the Cold Flow Development Test System experiments were conducted to examine chilldown and startup characteristics of the systems. The first series of tests, involving six individual tests, demonstrated the bootstrap ability of the NERVA Engine system under conditions of 50, 60, 70, and 90 psia tank pressure with 14 psia back pressure to the nozzle and turbine.

This report summarizes the Performance Analysis work done in support of the Cold Flow Development Test System series of tests.

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This is the Chemical Engineering Division Semiannual Report, July-- December 1965.

This report for June 1966, from the Chemical Processing Department at HAPO, discusses the following: Production operation; Purex and Redox operation; Finished products operation; maintenance: Financial operations; facilities engineering; research; and employee relations.

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Binding and migration energies and atomic configurations have been calculated for small carbon clusters in {alpha}-iron. A mathematical model was used which consisted of a spherical crystallite containing about 530 atoms which were treated as individual particles, surrounded by an elastic continuum with atoms imbedded in it. A two-body central force was used to simulate the interaction between nearest and next nearest. neighboring iron atoms in the crystallite and another was used for the iron-carbon interaction. The dicarbon, tricarbon, and tetracarbon binding energies were 0.14, 0.36, and 0.66 eV respectively, and the binding energy continued increasing for larger clusters by approximately 0.31 eV per additional carbon atom. The most stable configurations for clusters were very thin platelets on {001} planes in which the individual carbon atoms occupied octahedral sites. The axes of the carbon atoms were parallel to each other and perpendicular to the platelet~ lbe migration energy of the platelets was higher than the single carbon migration energy, and the migration mechanism consisted of peripheral atoms moving around the e.dges of the platelet.

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This report addresses the comparison of nuclear and explosive destruct concepts for nuclear rocket engines.

The stresses on a series of steel spherical-shell models with single nozzles radially attached were examined with strain gages. The parameters studied were nozzle dimensions and length of internal nozzle protrusions. The loads were internal pressure on the shell and nozzle and axial thrust and moment loadings on the nozzle. Both experimental and theoretical stresses are reported for six configurations for which the sphere dimensions were equal and the outside diameter of the attached nozzle was constant. In most instances the nozzle protruded through the vessels.