2021 Volume 8 Issue 3 Pages 21-00022
Minimizing the retention of nuclear fuel materials in glove box components and curtailing the external exposure dose are desirable. Therefore, plutonium and uranium mixed oxide (MOX) powder adhesion-prevention technology involving nanoparticle coating of the acrylic panels of the glove box is developed. Surface analysis using atomic force microscopy showed that root mean square roughness value of the nanoparticle-coated acrylic test piece surface (75.8 nm) was higher than that of the noncoated surface (2.14 nm). The nanoparticle coating reduced the van der Waals force between alumina particles and the test piece surface through the formation of nanosized rugged surfaces. The coating reduced the minimum adhesion force (normalized by the particle diameter) between the uranium dioxide particle and the acrylic test piece surface. For the smallest particle (diameter: ～5 μm) associated with desorption, this minimum adhesion force decreased to ～5%. The nanoparticle coating also lowered the average adhesion mass per unit area of the MOX powder on the acrylic test piece to ～10%. The expectation is that this method will reduce the retention of nuclear fuel materials in the box, lower the external exposure dose, and improve the visibility of the acrylic panels.