Processing of surrogate nuclear fuel pellets for better dimensional control with dry bag isostatic pressing
| Autor: | Rita E. Hoggan, Larry D. Zuck, W. Roger Cannon, Paul A. Lessing |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Cladding (metalworking)
Pressing Nuclear and High Energy Physics Materials science digestive oral and skin physiology technology industry and agriculture Pellets Sintering 02 engineering and technology equipment and supplies 021001 nanoscience & nanotechnology 01 natural sciences Grinding Granulation Nuclear Energy and Engineering 0103 physical sciences Pellet General Materials Science Composite material 010306 general physics 0210 nano-technology Yttria-stabilized zirconia |
| Zdroj: | Journal of Nuclear Materials. 482:34-41 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2016.05.034 |
| Popis: | A study of improved methods of processing fuel pellets was undertaken using ceria and zirconia/yttria/alumina as surrogates. Through proper granulation, elimination of fines and vertical vibration (tapping) of the parts bag prior to dry bag isostatic pressing (DBIP), reproducibility of diameter profiles among multiple pellets of ceria was improved by almost an order of magnitude. Reproducibility of sintered pellets in these studies was sufficient to allow pellets to be introduced into the cladding with a gap between the pellet and cladding on the order of 50 μm to 100 μm but not a uniform gap with tolerance of ±12 μm as is currently required. Deviation from the mean diameter along the length of multiple pellets, and deviation from roundness, decreased after sintering. This is not generally observed with dry pressed pellets. Sintered shrinkage was uniform to ±0.05% and thus, as an alternative, pellets may be machined to tolerance before sintering, thus avoiding the waste associated with post-sinter grinding. |
| Databáze: | OpenAIRE |
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