Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1565793 | Journal of Nuclear Materials | 2013 | 6 Pages |
Abstract
The fracture strength of green Minor Actinides (MA)-MOX pellets containing 75Â wt.% DUO2, 20Â wt.% PuO2, 3Â wt.% AmO2 and 2Â wt.% NpO2 was studied as a function of storage time, after mixing with the binder and before sintering, to test the effect of radiation damage on binders. Fracture strength degraded continuously over the 10Â days of the study for all three binders studied: PEG binder (Carbowax 8000), microcrystalline wax (Mobilcer X) and styrene-acrylic copolymer (Duramax B1022) but the fracture strength of Duramax B1022 degraded the least. For instance, for several hours after mixing Carbowax 8000 with MA-MOX, the fracture strength of a pellet was reasonably high and pellets were easily handled without breaking but the pellets were too weak to handle after 10Â days. Strength measured using diametral compression test showed that strength degradation was more rapid in pellets containing 1.0Â wt.% Carbowax PEG 8000 compared to those containing only 0.2Â wt.%, suggesting that irradiation not only left the binder less effective but also reduced the pellet strength. In contrast the strength of pellets containing Duramax B1022 degraded very little over the 10Â days period. It was suggested that the styrene portion present in the Duramax B1022 copolymer provided the radiation resistance.
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Authors
Paul A. Lessing, W. Roger Cannon, Gerald W. Egeland, Larry D. Zuck, James K. Jewell, Douglas W. Akers, Gary S. Groenewold,