Thesis (Ph. D.)--Oregon Graduate Center, 1987.

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No description available.

A transient code (TFETC) for calculating the temperature distribution throughout the radial and axial positions of a thermionic fuel element (TFE) has been successfully developed. It accommodates the variations of temperatures, thermal power, electrical power, voltage, and current density throughout the TFE as a function of time as well as the variations of heat fluxes arising from radiation, conduction, electron cooling, and collector heating. The thermionic fuel element transient code (TFETC) is designed to calculate all the above variables for three different cases namely: 1) Start-up; 2) Loss of flow accident; and 3) Shut down. The results show that this design is suitable for space applications and does not show any deficiency in the performance. It enhances the safety factor in the case of a loss of flow accident (LOFA). In LOFA, it has been found that if the mass flow rate decreases exponentially by a -0.033t, where t is a reactor transient time in seconds, the fuel temperature does not exceed the melting point right after the complete pump failures but rather allows some time, about 34 seconds, before taking an action. If the reactor is not shut down within 34 seconds, the fuel temperature may keep increasing until the melting point of the fuel is attained. On the other hand, the coolant temperature attains its boiling point, 1057 ��K, in the case of a complete pump failure and may exceed it unless a proper action to trip the reactor is taken. For 1/2, 1/3, and 1/4 pump failures, the coolant temperatures are below the boiling point of the coolant. / Graduation date: 1994

Graduation date: 1994

Haywood Shelton. / "March 21, 1957"--Cover. "Reprinted from The Physical review, vol. 107, no. 6, 1553-1557, September 5, 1957." / Includes bibliographical references. / Army Signal Corps Contract DA36-039-sc-64637

Andrew R. Hutson. / "January 13, 1955"--Cover. "Reprinted from The Physical review, vol. 98, no. 4, 889-901, May 15, 1955." / Includes bibliographical references. / Army Signal Corps Contract DA36-039 sc-42607 Project 132B Dept. of the Army Project 3-99-12-022

"December 11,1951." "This report is essentially the same as a doctoral thesis in the Department of Physics, Massachusetts Institute of Technology, 1950." / Bibliography: p. 25. / Army Signal Corps Contract No. DA36-039 sc-100. Project No. 8-102B-0. Dept. of the Army Project No. 3-99-10-022.

C.S. Hung. / "From a doctoral thesis submitted to the M.I.T. Department of Physics." "July 20, 1949." / Bibliography: p. 16. / Army Signal Corps Contract No. W36-039-sc-32037 Project No. 102B Dept. of the Army Project No. 3-99-10-022