The surface area data of feed oxide powders is of fundamental interest to optimize the process of nuclear fuel fabrication. The single-point Brunauer–Emmet–Teller (BET) specific surface area of several recycled powders (synthesized from rejected scrap fuel pellets) was determined and compared with as-received and standard specified powders. Recycled UO 2 , ThO 2 , (U,Pu)O 2 powders from bulk microwave dissolution-denitration process showed acceptable specific surface area for fuel pellet fabrication. The dry oxidation–reduction process recycled UO 2 and (U,Pu)O 2 powders demonstrated lower surface area than the standard specified due to larger particle size (D50). The surface area of ThO 2 from bulk microwave dissolution-denitration (3.5–4.5 m 2 /g) was comparable to the standard and further enhanced in polyvinyl alcohol (PVA) aided denitration.

中文翻译：

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几种再生氧化物粉末中BET比表面积的分析

原料氧化物粉末的表面积数据对于优化核燃料制造过程具有重要意义。确定了几种回收粉末（由废弃的废燃料芯块合成）的单点 Brunauer-Emmet-Teller (BET) 比表面积，并与收到的和标准指定的粉末进行比较。来自散装微波溶解-脱硝工艺的回收 UO 2 、ThO 2 、(U,Pu)O 2 粉末显示出可接受的燃料芯块制造比表面积。由于较大的粒径 (D50)，干法氧化还原工艺回收的 UO 2 和 (U,Pu)O 2 粉末的表面积低于指定的标准。来自整体微波溶解脱硝的 ThO 2 表面积 (3.5–4.5 m 2 /g) 与标准品相当，并在聚乙烯醇 (PVA) 辅助脱硝中进一步增强。