The status of radioactive contamination of the Clinch and Tennessee River systems from Nov. 1961 to April 1962 is reviewed. Data are included from studies on the fate of radioactive materials discharged to the Clinch River by the Oak Ridge National Laboratory, the mechanisms of dispersion of radionuclides released to the river, the direct and indirect hazards of waste disposal practices during the period, an evaluation of the over-all usefulness of this river for radioactive disposal purposes, and an evaluation of long-term monitoring procedures. The management of liquid wastes at ORNL is discussed and results are reported from studies on the accumulation and movement of radionuclides in White Oak Creek basin, the contamination of river biota, hydrologic measurements and analyses, measurements of radioactivity in the river system and in community water systems downstream from the Clinch River, and calculation of estimated radiation dosages from drinking Clinch River and Tennessee River water or immersion in the water at various downstream points. Results are included from a preimpoundment study of ecological conditions of Melton Hill Lake and estimates of the effects of Melton Hill Lake and power releases from Melton Hill Dam on hydrologic conditions in the river system. (C.H.)

Two long-term test cells were fabricated and tested. One was loaded with a 30 UC--70 ZrC sample and the other with a 90 UC--10 ZrC samrple. The rates of vaporization of these samaples in vacuum were determined both in the absence and in the presence of a Ni anode maintained at 983 deg K with an electrode spacirig of 20 mils, hr order to set the baseline values. Measurement of the rates of vaporization of these samples under these conditions in the presence of Cs vapor at a pressure of about 1.8 torr are in preparation and will be continued for 1000 hr. Operation of the first test cell, containing the 90 UC- -10 ZrC emitter, was terminated after 510 hr because of leakage through a faulty metal gasket sealing the electron-gun compartment. The second test cell, containing a vapor-deposited W-clad UC emitter, was assembled and operated for a period of 111 hr. The test was terminated because a leak developed between the cell compartment and the electron-gun compartment. A control cell containing a solid W emitter is being assembled to check the modifications made in the design of the electron-gun channber and the filament in order to overcome such …

The main purpose of this report are to provide 1) a reference source for the interchange of analog engine model information with AGC, and 2) a reference point for future WANL analog model development. Being a model status report, the present state of the models are presents.

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A description of the digital readout and drive portion of the Advanced Reactivity Measurement Facility II is presented along with the philosophy used in selecting the system block diagram and components, accuracy considerations, and a preliminary evaluation of performance and usability. The presentation discourages duplicating of the equipment; advantage should be taken of the opportunity to improve upon it. To this end guideposts are provided as well as a documentation of those aspects of the design that are considered worthy of duplication. (auth)