38 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "*Plutonium 238-- Radioisotope Heat Sources"  
Results: 1 - 24 next
open access

Fabrication of granule and pellet heat sources from oxalate-based $sup 238$PuO$sub 2$

Description: Suitable fuel forms for radioisotopic thermoelectric generators are granules of high internal density (greater than 95 percent of theoretical) or geometric shapes (80 to 90 percent dense) such as pellets or spheres. Both forms can be made from calcined $sup 238$Pu(III) oxalate. The conditions for processing PuO$sub 2$ are controlled during fuel form fabrication to ensure pellet integrity; to control density, grain size, and porosity distribution; and to minimize the fraction of potentially resp… more
Date: January 1, 1975
Creator: Bickford, D. F. & Rankin, D. T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design, testing, and fabrication of heat sources for underwater application

Description: The sequence of events in the design, testing and fabrication of a radioisotopic heat source using available $sup 238$PuO$sub 2$ fuel that would be amenable to a Navy 0.5-W (electrical) Radioisotopic Thermoelectric Generator for undersea application is discussed. Various designs were considered as a function of heat leak in order to adopt the most desirable capsule for a volume- constrained application. Testing considerations are discussed for capsule compliance with IAEA/ENEA Safety Series 6 a… more
Date: November 1, 1975
Creator: Luthy, D. F. & Anderson, C. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nuclear Heat Sources for Cryogenic Refrigerator Applications

Description: Spacecraft cryogenic refrigerators require thermal inputs on the order of 1000 W. First, the characteristics of solar-electric and radioisotope heat source systems for supplying this thermal input are compared. Then the design of a $sup 238$Pu heat source for this application is described, and equipment for shipping and handling the heat source is discussed. (LCL)
Date: June 1, 1975
Creator: Raab, Bernard; Schock, Alfred; King, William G.; Kline, Thomas & Russo, Frank A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Savannah River Laboratory monthly report: {sup 238}Pu fuel form processes

Description: Progress during August 1975 in the development of {sup 238}PuO{sub 2} heat sources is reported. In studies to characterize {sup 238}PuO{sub 2}, the following were concluded: particle size was determined to be the most important characteristic affecting the variation in fabricability of {sup 238}PuO{sub 2}; problem feed consists of smaller particles (2 to 4 {mu}m) than older, acceptable feed (4 to 6 {mu}m). The particle size of new feed has varied from 3 to 10 {mu}m primarily as a result of vary… more
Date: August 1, 1975
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Hypervelocity particle breakup: analysis and experiment. Feasibility report

Description: During the reentry destruction of an isotopic generator, the mechanisms of fuel form ablation must be predictable to properly assess the nuclear hazard associated with the event. Ultimate land deposition patterns and contaminant densities are directly a function of the final ablative particle size. One mechanism of fuel form ablation is the mechanical breakup of molten material by aerodynamic forces created during hypervelocity reentry. The object of this study was to determine the feasibility … more
Date: June 1, 1966
Creator: Osmeyer, W. E.; Olsen, T. M. & Braun, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thermal shock analysis of ceramic multihundred watt spheres

Description: The thermal fracture resistance of plutonia Multihundred Watt (MHW) fuel spheres was analyzed assuming boundary conditions of (1) constant heating or cooling rate for the sphere surface, (2) heating or cooling with a constant surface heat transfer coefficient at the sphere surface, and (3) heating or cooling the sphere surface solely by radiation. Thermal damage resistance (mechanical weakening) of MHW spheres was analyzed in terms of the fracture energy and crack system present in the fuel. Us… more
Date: March 25, 1974
Creator: Tennery, V. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Data sheets for PPO radioisotopic fuel

Description: PPO is the acronym for Pure Plutoniunn Oxide. The thermal energy of this fuel results from the radioactive decay of /sup 238/ Pu this energy is converted into usable electric power for space probe or other applications. The basic fuel module associated with the current MHW heat source is a PPO sphere 1.465 plus or minus 0.015 in. in dia and containing 100 plus or minus 2 thermal watts. The spheres are individually encapsulated and then assembled into geometric arrays to form the working heat so… more
Date: December 1, 1973
Creator: Keenan, T. K.; Kent, R. A.; Mulford, R. N. R. & Shupe, M. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Radioisotope heat source development for an artificial heart device. Phase I. Final report

Description: Detailed parametric analyses of vented radioisotope heat sources were performed to arrive at a design optimized in weight, volume, and safety. The top rated system was a single-layer Hafnalloy heat source. Due to limited mechanical property, compatibility, and heat source test data available for this material, however, the three-layer Pt-20Rh/T-11I/Pt-20Rh design, which rated next highest, was selected as the baseline design. The heat source, 0.984 in. in dia by 1.795 in. long, contains 33.1 wa… more
Date: April 1, 1973
Creator: Lurie, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mound Laboratory isotopic power fuels programs: July--September 1973

Description: Progress in the isotopes fuel program during July to Oct 1973 is reported. Preparation and fuel characterization studies of /sup 238/Pu fuels continued. The effect of lower pressing temperatures on pressed plutonium oxide (PPO) spheres was evaluated. Plutonium-238 dioxide feed material that was sintered to a maximum of only 900 deg C was pressed under otherwise normal conditions into a Multihundred Watt (MHW) type fuel sphere. This pressing resulted in a sphere with near-perfect surface texture… more
Date: November 21, 1973
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen