Analysis Results of Samples Reactivity Measurements at BFS-58-1i1 Assembly on the Basis of JNC Analytical System and BFS Traditional Approach

Bednakov, S.

BFS-58-1i1 assembly is a critical configuration constructed at BFS-2 fast critical facility, IPPE/Obninsk/Russia, containing uranium-free Plutonium fuel in its central zone. Sodium void reactivity effect, spectral averaged cross-sections, Doppler reactivity effect, material samples central reactivity worth (CRW) have been measured there. The results obtained by means of the last experimental technique is a subject of the current report. ln order to make adequate a comparison conditions for calculation and experiment a code for heterogeneous and bilinear corrections for central reactivity worth ratios based on IPPE developments has been written and applied. Some extrapolated experimental data was also examinated from the point of view of their consistency and reliability and a conclusion about it has been made. The previous analysis results made by different laboratolies have been included in the current report and the discrepancies have been discussed.