Presentation Information
[3D09]Development of a spatial configuration based criticality
evaluation index for fuel debris safety management
*Kazuya Shimada1, Kenya Suyama1 (1. JAEA)
Keywords:
Fuel debris,Effective multiplication factor,Pair distribution function
In fuel debris systems where water and fuel are mixed, their spatial configuration affects the effective multiplication factor. For critical safety management of debris, we examined indicators relating spatial configuration to effective multiplication factor keff, with the long-term goal of quantifying this relationship. Initially targeting critical experiments with fuel rods randomly arranged on lattices, we proposed an indicator h for debris applications without geometric constraints like lattice arrangements. This indicator is defined from nearest-neighbor distance distributions of fuel rods, inspired by pair distribution functions in materials science. To validate this indicator, we confirmed correlations in simplified lattice systems. Results showed negative correlations between h and keff, suggesting the indicator's potential. Future work will examine systems without lattice constraints.