Densification related pellet diameter shrinkage in low burnup thoria-base fuels (LWBR development program) [electronic resource].

Published:: Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1978.
Physical Description:: Pages: 54 : digital, PDF file
Additional Creators:: United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

In-reactor densification of ThO/sub 2/ and ThO/sub 2/--UO/sub 2/ fuel of low burnup and low power operation (hence low temperature) was assessed by measuring fuel pellet diameter changes. Pellet diameter changes ranged from nil in a large grain, low temperature thoria pellet (98.9 percent theoretical density) to -1.06 percent in a small grain, moderate temperature ThO/sub 2/-30 w/o UO/sub 2/ pellet (93.8 percent theoretical density). A correlation was established between quantity of small pores (<2.3 ..mu..m diameter) and as-fabricated fuel grain size. An empirical equation, based on densification (pore closure) plus fuel swelling, was formulated for pellet diameter change as a function of initial grain size and fuel burnup.

Report Numbers:

E 1.99:wapd-tm-1345
wapd-tm-1345

Subject(s):

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Note:

Published through SciTech Connect.
09/01/1978.
"wapd-tm-1345"
Spahr, G.L.
Bettis Atomic Power Lab., West Mifflin, PA (USA)

Funding Information:

EY-76-C-11-0014

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