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PRELIMINARY RESULTS OF THE SNAP 2 EXPERIMENTAL REACTOR

Description: The operating history of the SNAP 2 Experimental Reactor (SER) and the preliminary results from the testing program are presented. The total energy generated during the life of the reactor was 224,650 kilowatt hours. This is equivalent to approximately one-half year of full-power operation. The methods used to obtain the reactor parameters are also described. The experimental data obtained were generally in excellent agreement with calculated valuess The principal comparisons are tabulated. (auth)
Date: April 1, 1961
Creator: Hulin, M.W. & Beall, J. eds.
Partner: UNT Libraries Government Documents Department

SNAP-2 RELIABILITY PROGRAM

Description: The basic concept of the SNAP 2 reliability program is discussed. The basis for the reliability requirements for SNAP 2 is presented, and the fundamental methods by which these requirements can be accomplished are described. The reliability objectives for the system, a description of basic failure characteristics, and design considerations for reliability margins and component selection are presented, together with test plans for establishing reliability margins and for demonstrating system reliability. (auth)
Date: August 31, 1963
Creator: Burgess, D.S.
Partner: UNT Libraries Government Documents Department

SNAP I POWER CONVERSION SYSTEM PUMP DEVELOPMENT. Period covered: February 1, 1957 to June 30, 1959

Description: S>Pump development for the SNAP I power conversion system is described. A four-vaned impeller pump supplemented by a jet boost stage was selected for development to meet the final design requirements. Information on other designs, pump test facilities, and conclusions are included. (J.R.D.)
Date: June 20, 1960
Partner: UNT Libraries Government Documents Department

SNAP I POWER CONVERSION SYSTEM ALTERNATOR DEVELOPMENT. Period covered: February 1, 1957 to June 30, 1959

Description: Alternator development for the SNAP 1 power conversion system is described. A radial air-gap permanent-magnet 6-pole single-phase 2600-cps alternator, rated at 536 watts, 0.8 power factor, and 115 volts was selected. Discussion of requirements and specifications, design and performance, test facilities, and conclusions are included. (J.R.D.)
Date: June 20, 1960
Creator: Morgan, H.J.
Partner: UNT Libraries Government Documents Department

Ultrahigh Specific Impulse Nuclear Thermal Propulsion

Description: Research on nuclear thermal propulsion systems (NTP) have been in forefront of the space nuclear power and propulsion due to their design simplicity and their promise for providing very high thrust at reasonably high specific impulse. During NERVA-ROVER program in late 1950's till early 1970's, the United States developed and ground tested about 18 NTP systems without ever deploying them into space. The NERVA-ROVER program included development and testing of NTP systems with very high thrust (~250,000 lbf) and relatively high specific impulse (~850 s). High thrust to weight ratio in NTP systems is an indicator of high acceleration that could be achieved with these systems. The specific impulse in the lowest mass propellant, hydrogen, is a function of square root of absolute temperature in the NTP thrust chamber. Therefor optimizing design performance of NTP systems would require achieving the highest possible hydrogen temperature at reasonably high thrust to weight ratio. High hydrogen exit temperature produces high specific impulse that is a diret measure of propellant usage efficiency.
Date: February 9, 2009
Creator: Charmeau, Anne; Cunningham, Brandon & Anghaie, Samim
Partner: UNT Libraries Government Documents Department

The National Criticality Experiments Research Center at the Device Assembly Facility, Nevada National Security Site: Status and Capabilities, Summary Report

Description: The National Criticality Experiments Research Center (NCERC) was officially opened on August 29, 2011. Located within the Device Assembly Facility (DAF) at the Nevada National Security Site (NNSS), the NCERC has become a consolidation facility within the United States for critical configuration testing, particularly those involving highly enriched uranium (HEU). The DAF is a Department of Energy (DOE) owned facility that is operated by the National Nuclear Security Agency/Nevada Site Office (NNSA/NSO). User laboratories include the Lawrence Livermore National Laboratory (LLNL) and Los Alamos National Laboratory (LANL). Personnel bring their home lab qualifications and procedures with them to the DAF, such that non-site specific training need not be repeated to conduct work at DAF. The NNSS Management and Operating contractor is National Security Technologies, LLC (NSTec) and the NNSS Safeguards and Security contractor is Wackenhut Services. The complete report provides an overview and status of the available laboratories and test bays at NCERC, available test materials and test support configurations, and test requirements and limitations for performing sub-critical and critical tests. The current summary provides a brief summary of the facility status and the method by which experiments may be introduced to NCERC.
Date: September 1, 2011
Creator: Bragg-Sitton, S.; Bess, J. & Werner, J.
Partner: UNT Libraries Government Documents Department