Analysis of internal blockage within a wire-wrapped subassembly for liquid metal fast breeder reactor

The thermo-hydraulic analysis results for the local internal blockage within a wire-wrapped subassembly are presented. Calculations were performed using the SABRE computer code for the range of blockage positions, sizes, and shapes to investigate the seriousness and detectability of the internal blockage. The magnitude and location of the peak temperatures together with the temperature distribution at subassembly exit were investigated in order to look at the potential for damage within the subassembly, and the possibility of blockage detection. The driver fuel subassembly of KALIMER breeder core was used in this analysis. The analysis result shows that the calculated peak temperatures for 6 subchannel blockage, which is design bases event of KALIMER core, satisfies the acceptance criteria