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Densification related pellet diameter shrinkage in low burnup thoria-base fuels
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.
Date:
September 1, 1978
Creator:
Spahr, G. L.
System:
The UNT Digital Library
An Analysis of Transient Clad Strains in Cylindrical Fuel Elements Including the Effects of Oxide Pellet Cracking (Stripe).
None
Date:
February 1970
Creator:
O'Donnell, W. J.; Clarke, W. G. & Campbell, W. R.
System:
The UNT Digital Library