Abstract
This work aimed at criticality safety in fuel-fabrication or reprocessing facilities. To estimate the expected released energy in criticality accidents of several fuel-solution tanks based on the energy released in a single-fuel-solution-tank accident, the total energy released in a two-tank system was evaluated with different compositions of fuel solutions. The code used for the analysis took into account the neutronic coupling between the tanks. The results made clear that as the fuel enrichment increases, neutronic coupling becomes stronger. The calculated increase of the total energy released in a criticality accident of a system with two fuel-solution tanks compared to that of a system with just one was roughly the same regardless of different feedback model used for the analysis. The results show that the difference in energy release between multiple-tank and single-tank systems of similar composition may be evaluated using the developed transient analysis code.
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