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

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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. The surface was bright and totally free of any visible cracks. However, upon subjection to the normal 1500 deg C vacuum heat treatment, the ... continued below

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Pages: 40

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Creator: Unknown. November 21, 1973.

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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. The surface was bright and totally free of any visible cracks. However, upon subjection to the normal 1500 deg C vacuum heat treatment, the sphere cracked severely. Metallographic examination of selected areas of MHLV- PPO spheres showed that the spheres were not uniform in microstructure. They possessed nonuniform grain size and porosity distribution. Spheres exposed to high-temperature heat treatments also were nonuniform in microstructure. Calculations were performed to determine the stresses that appear in MRW PPO spheres due to temperature gradients. Thermal shock analyses were also performed. The data obtained as a result of these analyses were used in establishing a controlled heating and cooling cycle for the 1500 deg C, 1-h outgassirg process for development and production spheres. In order to evaluate the performance of a quadrupole mass spectrometer capable of evolved gas analysis of PuO/sub 2/ up to 1850 deg C, a residual gas analysis system utilizing a quadrupole mass spectrometer was installed in an alpha glovebox. The installation and cold check-out of the system are essentially completed. Several nonradioactive samples and standands were analyzed to establish the sensitivity and to calibrate the instrument. Samples of iridium hemishells were examined using the quadrupole mass spectrometer and both transmission and scanning electron microscopy. These examinations were performed in an attempt to better identify the nature of the iridium being used in the Multihundred Watt Heat Source Program. (LCL)

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Pages: 40

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  • Other Information: Orig. Receipt Date: 30-JUN-74

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  • Report No.: MLM--2099
  • Grant Number: AT(33-1)-GEN-53
  • DOI: 10.2172/4414930 | External Link
  • Office of Scientific & Technical Information Report Number: 4414930
  • Archival Resource Key: ark:/67531/metadc1020187

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Creation Date

  • November 21, 1973

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

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  • Oct. 23, 2017, 8 p.m.

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Mound Laboratory isotopic power fuels programs: July--September 1973, report, November 21, 1973; United States. (digital.library.unt.edu/ark:/67531/metadc1020187/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.