Compatibility and stability of plutonia-238 base cermet fuel forms in refractory alloy containers at 1500$sup 0$ to 2000$sup 0$C

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The compatibility of two and stability of three plutonia-238 base cermet fuels were investigated at 1500 deg to 2000 deg C from which were well in excess of current RTGs. A Battelle-Columbus Laboratories plutonia-molybdenum cermet (BCL-PMC) developed as a precurser of the current PMC fuel form was investigated for stability at 1500 deg to 2000 deg C for times to 10,000 h. The thoria and molybdenum overcoated test specimens encapsulated in single W-25Re containers degraded with increasing time and temperature. The 1000-h specimens remained relatively intact; the 10,000-h specimens transported almost entirely to the container walls. The interim plutonia-thoria-molybdenum solid-solution ... continued below

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Pages: 74

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Watrous, J.D. & Ferguson, W.E. September 1, 1973.

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The compatibility of two and stability of three plutonia-238 base cermet fuels were investigated at 1500 deg to 2000 deg C from which were well in excess of current RTGs. A Battelle-Columbus Laboratories plutonia-molybdenum cermet (BCL-PMC) developed as a precurser of the current PMC fuel form was investigated for stability at 1500 deg to 2000 deg C for times to 10,000 h. The thoria and molybdenum overcoated test specimens encapsulated in single W-25Re containers degraded with increasing time and temperature. The 1000-h specimens remained relatively intact; the 10,000-h specimens transported almost entirely to the container walls. The interim plutonia-thoria-molybdenum solid-solution cermet (SSC) fuel form lost from most to all of the molybdenum network in exposure at 1800 deg C for 5000 h. This behavior was inferior to the two PMC fuel forms. Comparative compatibility of the SSC was the same as the PMC. Behavior of the current reference PMC fuel form was equivalent to the BCL-PMC, with enhanced stability exhibited when exposed in TZM or Ta-10W inner containers. Exposures at 1500 deg C for 500 and 5000 h, 1800 deg C for 1000 and 5000 h, and 2000 deg C for 1000 h in double container semi-system test configurations resulted in increased fuel form degradation with increasing temperature and time. However, TZM liners with TZM, Mo-46Re, and W-25Re structural members provided excellent containment at all temperatures. (auth)

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Pages: 74

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

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  • Report No.: MDC-G--4415
  • Grant Number: AT(45-1)-2138
  • DOI: 10.2172/4386332 | External Link
  • Office of Scientific & Technical Information Report Number: 4386332
  • Archival Resource Key: ark:/67531/metadc1026654

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  • September 1, 1973

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  • Oct. 15, 2017, 10:09 p.m.

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  • Oct. 20, 2017, 3:29 p.m.

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Watrous, J.D. & Ferguson, W.E. Compatibility and stability of plutonia-238 base cermet fuel forms in refractory alloy containers at 1500$sup 0$ to 2000$sup 0$C, report, September 1, 1973; United States. (digital.library.unt.edu/ark:/67531/metadc1026654/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.