Helium bubbles at grain boundaries of high-density $sup 238$PuO$sub 2$ shards

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Hydroxide- and oxalate-base $sup 238$PuO$sub 2$ shards that were sintered to high density at 1200 or 1600$sup 0$C and then aged for 6 months or more exhibited grain-boundary gas bubbles due to agglomeration of alpha-decay helium when heated to 1200$sup 0$C and above. Conditions for bubble formation depended markedly on shard microstructure; large-grained shards with few large residual sintering pores formed gas bubbles at lower temperatures than small- grained shards with many pores. This behavior was especially apparent in oxalate- base $sup 238$PuO$sub 2$, in which small-grained shards resisted bubble formation to above 1500$sup 0$C; small-grained hydroxide-base shards with less ... continued below

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Pages: 23

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McDonell, W.R.; Sheenan, J.E. & Sisson, R.D. January 1, 1975.

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  • Savannah River Laboratory
    Publisher Info: Du Pont de Nemours (E.I.) and Co., Aiken, S.C. (USA). Savannah River Lab.
    Place of Publication: Aiken, South Carolina

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Hydroxide- and oxalate-base $sup 238$PuO$sub 2$ shards that were sintered to high density at 1200 or 1600$sup 0$C and then aged for 6 months or more exhibited grain-boundary gas bubbles due to agglomeration of alpha-decay helium when heated to 1200$sup 0$C and above. Conditions for bubble formation depended markedly on shard microstructure; large-grained shards with few large residual sintering pores formed gas bubbles at lower temperatures than small- grained shards with many pores. This behavior was especially apparent in oxalate- base $sup 238$PuO$sub 2$, in which small-grained shards resisted bubble formation to above 1500$sup 0$C; small-grained hydroxide-base shards with less internal porosity than oxalate-base shards formed bubbles at lower temperatures. Helium is apparently released from aged $sup 238$PuO$sub 2$ shards at high temperatures by bulk diffusion within grains to the grain boundaries, where bubbles are formed and interconnect into networks which permit helium escape. It is postulated that helium is released by grain boundary diffusion at temperatures below thresholds for grain boundary bubble formation. Small grain size and high residual porosity within grains inhibit the formation of the grain-boundary gas bubbles by reducing the concentration of helium gas at the grain boundaries. (10 fig) (auth)

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Pages: 23

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Dep. NTIS

Source

  • Joint meeting of the American Nuclear Society and the Atomic Industrial Forum, San Francisco, California, USA, 16 Nov 1975

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  • Report No.: DP-MS--75-67
  • Report No.: CONF-751101--49
  • Grant Number: AT(07-2)-1
  • Office of Scientific & Technical Information Report Number: 4145123
  • Archival Resource Key: ark:/67531/metadc868773

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1975

Added to The UNT Digital Library

  • Sept. 16, 2016, 12:32 a.m.

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  • Feb. 17, 2017, 3:04 p.m.

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McDonell, W.R.; Sheenan, J.E. & Sisson, R.D. Helium bubbles at grain boundaries of high-density $sup 238$PuO$sub 2$ shards, article, January 1, 1975; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc868773/: accessed January 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.