Home / Store / Journals / Electronic Articles / Nuclear Science and Engineering / Volume 85 / Number 1
Nuclear Science and Engineering
Volume 85 / Number 1 / September 1983 / Pages 51-55
Format:electronic copy (download)
The contributions from actinides to the decay heat and the decay rate relative to those from fission products in highly irradiated 235U-enriched uranium has been assessed. This assessment, which is based on measured and associated calculated actinide concentrations in a sample of uranium in which the 235U had been burned to 17% of its original >97% content (i.e., to ∼17% 235U), indicates that for most practical times (<108 s) after reactor shutdown, the actinide contribution to the decay heat and to the decay rate is a reasonably small fraction (<7%) of the total and comes mainly from 237U, 238Np, and 238Pu. These results differ from those for uranium only slightly enriched in 235U.
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