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The two K Reactors at the Hanford Plant of the Atomic Energy Commission were retubed in 1963 with ribless Zircaloy process tubes. These tubes, 1.81 inch OD x 0.037 inch wall, were made by tube reducing methods from extruded blooms and were installed without final pickling or autoclaving. These tubes are used with once-through filtered water with a maximum coolant temperature of approximately 110 C. After approximately two years` service, it was discovered that these tubes were absorbing hydrogen in a totally unexpected and alarming manner. It was found that the downstream few feet of these tubes had a layer of massive hydride platelets, several mils thick, on the inner surface, and that the hydrogen content of the tube wall beneath this layer had increased from the as-fabricated level of 5--15 ppm to 50--75 ppm. The portion of the tubes so affected was downstream of the fuel charge. Physical testing has indicated loss of ductility but no significant changes in strength, Cold burst tests resulted in a ductile failure mode with no tendency toward brittle fracture. A program to determine the basic mechanism responsible for this phenomenon as well as practical means for its elimination will be the subject of …

This report addresses the after installation displacement measurements for linear variable displacement transducers.

This report addresses the ranking space power systems

Progress in the Plowshare program during 1966 was characterized by the upsurge of interest by industry in the contained applications of nuclear explosions for gas and oil stimulation, storage and disposal, recovery of oil from oil shales, and mining. Advances in the excavation area were limited to improved code calculations as no field experiments were conducted.

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This report addresses the chemical engineering division research highlights of May 1965 to April 1966.

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

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

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It is the purpose of this report to present data obtained from the routine reactor effluent radioactivity monitoring program as well as the results obtained from the research and development program directed toward the reduction of effluent radioactivity. Samples of the effluent from each reactor are obtained each weekday during operation and analyzed for P{sup 32}, As{sup 76}, Np{sup 239}, and Cr{sup 51}.

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The IBM 2740 and 2741 are IBM's versions of a printer-keyboard designed primarily for point to point communication. The 2740 is the more glorious one with numerous options. The. 2741 is as simple as possible with just one major option. Neither of these units approaches the complexity or number of options available on a 1050 system.

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The purpose of this study was to evaluate radiological conditions that exist on the riverbank of the Columbia River. Included was a comparative study of the suitability of three instruments to measure the dose rates. These instruments were a NaI (T1) scintillation counter normally used for aerial monitoring, a bioplastic scintillation counter normally used as a road monitor, and a portable 40 liter ionization chamber normally used to measure very low gamma dose rates. The selection of representative sites for the comparative study was based on an initial GM survey of the general areas in question. Seven sites were studied--from Vernita Ferry Landing above the Hanford project to Sacajawea Park below Pasco.

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