Three Instriimented capsules were irradiated in the MIR to assess the in-reactor performance of the fuel proposed for Core B of the Enrico Fermi Fast Breeder Reactor, Each capsule contained two miniature fuel plates, 2.0 X 0.5 X 0,116 in,, comprised of an 0.102-in.-thick fuel-bearing section containing 33 wt ^ UO2 dispersed in type 347 stainless steel and clad on both surfaces with 0.007-in.-thick type 347 stainless steel. Exposure conditions for the capsules were as follows: Capsule 46-2 46-4 46-5 Sp(ecimen 5

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i s being conducted i n t h e 05 p o o l s i d e p o s i t i o n of t h e Oak Ridge Research Reactor t o a n approximate burnup of 3 a t. % U.

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