Fabrication of UO2 Fuel Rod by Vibratory Compaction

概要

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Studies of vibratory compacted fuel have become very active in view of the cost reduction possibilities in fuel fabrication. Recent advances in UO2-PuO2 fuels, symbolized in the realization of ATR and FBR, have also given impetus to these studies. This report describes a fabrication technique applicable to various vibratory compaction fuel rods, and also specifies some requirements governing the compaction oflong size fuels to high density. The principal results are: (1) Compaction to 85-89% T.D. is possible even using firm fused UO2 powder of homogeneous particle size. (2) Addition of 35% of highly fired UO2 (-20-+325 mesh) to coarse fused UO2 (-3-+10 mesh) shortens the compaction time, and improves the reproducibility of the final compaction densities. (3) The addition of a loading weight on top is effective in raising the density when starting with powders of single particle size and in small quantity, but the effect becomes minor for mixed powders and in large quantity compaction. (4) The quantity charged is one of the major factors determining the vibration time required to obtain high density of compact. (5) Increase of impact force results in higher densities with the effect of crushing and compression of UO2 particles. (6) Vibswaging improves density distribution.
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