Measurements for a Comparison of HTI-BISO Particles with Different Contamination

Automatic translation: 1. Introduction: Mixed oxide cores coated as part of the project were developed by HOBEG a decisive step towards reducing the contamination of HTI-BISO particles with 400 μm (Th, U) O₂ cores done. The contamination of the HTI layer for the new particles is only about 140 x 10 ^- 6 U / Uges, while the contamination of the THTR standard particles is 600-900 x 10 ^- 6 U / Uges amounts. This reduction in layer contamination is the most important contribution to reduce matrix contamination in the fuel assembly. The one with the new Particles achieved matrix contamination of 47 x 10 ^- 6 U / Ug on average the high HHT / PNP requirements of U / Uges 100 x 10 ^- 6 for matrix contamination. The quality of the HTI particles could be increased in essential points layer thicknesses and densities have lower standard deviations. The anisotropy values are in the same band as for the THTR particles. The The comparability of the qualities must be similar to the introduction of the Mixed gas LTI coating can be proven by further measurements. These measurements are to be carried out by the IRW as part of the HBK project.