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RUBIDIUM AND CESIUM EVALUATION PROGRAM. SPACE POWER SYSTEMS TECHNOLOGY STUDIES. Quarterly Technical Report for Period February 1 through April 30, 1961. Report No. 1

Description: A summary is given of the development of equipment to obtain data for the corrosion and solubility properties of rubidium, and for the corrosion and thermodynamic properties of cesium. (B.O.G.)
Date: October 31, 1961
Creator: Young, P.F.
Partner: UNT Libraries Government Documents Department

THE SNAP II POWER CONVERSION SYSTEM TOPICAL REPORT NO. 14. MERCURY MATERIALS EVALUATION AND SELECTION

Description: SNAP II is the designation for a 3 kw nuclear auxiliary power unit to be used in a satellite vehicle. The SNAP II System consists of a reactor heat source, a boiler, a Hg Rankine engine, an alternator, and a condenser. The corrosion and subsequent mass transfer resulting from the use of Hg as the thermodynamic wo:king fluid are important considerations in the selection of materials for the SNAP II System. Consequently, corrosion and mass transfer behavior were under study for the past three years. Recent results of this study are presented and the corrosion mechanisms involved are discussed. (auth)
Date: April 10, 1961
Creator: Nejedlik, J.F.
Partner: UNT Libraries Government Documents Department

THE SNAP II POWER CONVERSION SYSTEM TOPICAL REPORT NO. 10, SODIUM PUMP DESIGN AND TESTING

Description: BS>SNAP II is the designation for a 3 kw nuclear auxiliary power unii for utilization in a satellite vehicle. The SNAP Il system consists of a reactor source which utllizes a mercury Rankine engine for power conversion. Design details and test data for the primary fluid reactor coolant pump used to transfer heat from the reactor to the mercury boiler are described. (auth)
Date: August 1, 1960
Creator: Snoke, B.A. & Tiltins, J.
Partner: UNT Libraries Government Documents Department

THE SNAP II POWER CONVERSION SYSTEM TOPICAL REPORT NO. 9, ALTERNATOR ANALYSIS, DESIGN AND DEVELOPMENT

Description: The 3 kw nuclear auxiliary power unit deslgnated SNAP II is intended for use in a satellite vehicle. The system consists of a reactor heat source, a mercury Rankine engine, and a permanent magnet alternator. The design details, test results, and development of the SNAP lI alternator are presented. (auth)
Date: October 31, 1962
Creator: Bucklin, R.L.; Galysh, J.W. & Morgan, H.J.
Partner: UNT Libraries Government Documents Department

SNAP II POWER CONVERSION SYSTEM TOPICAL REPORT NO. 11, ORBITAL FORCE FIELD BOILING AND CONDENSING EXPERIMENT

Description: The characteristics of Rankine space power plants in the zero gravity aspect of the environment of space were lnvestigated. The expected effects of Rankine space power plants are described. Discussions of experimental techniques for studying these phenomena show that this information can be obtained rapidly and economically. Recommendations for a program to supplement SNAP II and slmllar Ranklne space power development efforts in this vital area are made, and consist of: the development and testing of a small system that adequately simulates a complete Ranklne system, first in zero grayity and finally, in the complete orbltal environment; followed by, the development and similar testing of a complete Rankine system using SNAP ll hardware. (auth)
Date: January 15, 1960
Creator: Grevstad, P.E.
Partner: UNT Libraries Government Documents Department

Materials Technology Support for Radioisotope Power Systems Final Report

Description: Over the period of this sponsored research, UDRI performed a number of materials related tasks that helped to facilitate increased understanding of the properties and applications of a number of candidate program related materials including; effects of neutron irradiation on tantalum alloys using a 500kW reactor, thermodynamic based modeling of the chemical species in weld pools, and the application of candidate coatings for increased oxidation resistance of FWPF (Fine Weave Pierced Fabric) modules.
Date: October 7, 2008
Creator: Kramer, Daniel P. & Barklay, Chadwick D.
Partner: UNT Libraries Government Documents Department

Thermohydraulic modeling of nuclear thermal rockets: The KLAXON code

Description: The hydrogen flow from the storage tanks, through the reactor core, and out the nozzle of a Nuclear Thermal Rocket is an integral design consideration. To provide an analysis and design tool for this phenomenon, the KLAXON code is being developed. A shock-capturing numerical methodology is used to model the gas flow (the Harten, Lax, and van Leer method, as implemented by Einfeldt). Preliminary results of modeling the flow through the reactor core and nozzle are given in this paper.
Date: July 1, 1992
Creator: Hall, M. L.; Rider, W. J. & Cappiello, M. W.
Partner: UNT Libraries Government Documents Department

Liquid hydrogen flow problems in Kiwi reactors

Description: The Kiwi series of reactors were the first ones tested in the US Rover Program in the development of nuclear rocket engines for space propulsion. The early experiments with liquid hydrogen showed that parallel flow systems were prone to uneven flow distributions and violent fluctuations in pressure and flow that were capable of destroying a reactor core. Kiwi flow distribution problems were solved by using multiple feed lines into the nozzle cooling system and carefully balancing impedance among them. The violent pressure and flow fluctuations were eliminated after their cause was identified as resonance phenomena driven by the response to flow disturbances of heat transfer through a superheated hydrogen layer. Smooth flow operations were assured by rapidly bringing operating pressures beyond several times the critical pressure of hydrogen. After this initial rough start, solid core nuclear rocket engines successfully passed milestones of achievements during the remainder of the Rover program.
Date: September 1, 1992
Creator: Thurston, R. S.
Partner: UNT Libraries Government Documents Department