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Report No.
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Development of dry rework technology in MOX fuel fabrication process; Selection and characterization of pulverizer for particle size adjustment of dry recycled powder

Yamamoto, Kazuya; Makino, Takayoshi ; Iso, Hidetoshi ; Segawa, Tomoomi ; Kawaguchi, Koichi  ; Ishii, Katsunori 

In the MOX fuel fabrication process, a dry recycle technology has been developed to effectively utilize dry recovered powder obtained by crushing out of specification MOX pellets. The particle size of the dry recovery powder is divided into three classes; coarse size (about 250 $$mu$$m or less), medium size (about 100 $$mu$$m or less), and fine size (about 10 $$mu$$m or less) by the current crushers, and the effect of controlling the density of sintered pellets is obtained to a certain extent by adding the dry recovered powder to the raw powder. In this report, with the aim of more finely adjusting the particle size of the dry recovery powder, a buhrstone mill and a collision plate-type jet mill were selected as grinders that can adjust the dry recovered powder within a particle size range of 250 $$mu$$m or less, and the particle size adjustment test was conducted to pulverize the tungsten-carbide-cobalt (WC-Co) pellets as a simulated material for the MOX pellets. The buhrstone mill can control the particle size within a certain range by adjusting the grindstone clearance, but particles with a particle size of 250 $$mu$$m or more may be discharged. On the contrary, it is expected that the particle size of the collision plate-type jet mill can be controlled in the range of 250 $$mu$$m or less by adjusting the classification zone clearance. Therefore, the collision plate-type jet mill is more suitable for adjusting the particle size of the dry recovered powder than the buhrstone mill.

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