Comparison of yield stress related to compacted method of the spent fuel assembly skeleton

To increase the utilization of uranium resources contained in the spent fuel, the spent fuel is reused. For this, the spent fuel is disassembled or spent fuel rod is extracted from the spent fuel assembly. After the rod is extracted, the remaining components of spent fuel assembly, so called a NFBC(Non-Fuel Bearing Components), should be compacted for the final disposal. To develop the compacting device, the compacted device should be considered in terms of fabrication cost of devices, maintainability, required power. Skeleton is composed of the top and bottom nozzle, grid, guide tube, compacted elements etc. Especially, the grid and guide tube is important factor for the skeleton compaction. In this study the characteristic of these three methods was investigated in the front face method, in the side face method, in the mixed face method for the grid compaction. Also it was considered in the bulking and compacting stress for the required power of the guide tube. The theoretical values are compared with the experimental values. Finally, the side face method is selected by the comparison