Bamboo-SFuel: A nuclide composition evaluation code for PWR spent fuel in NECP-Bamboo

To accurately obtain the nuclide composition in spent fuel, a nuclide composition calculation program named Bamboo-SFuel has been developed as a new component in the PWR-core analysis software NECP-Bamboo. It can switch between different depletion data libraries, including one with 233 nuclides in the lattice code Bamboo-Lattice, the one with 1547 nuclides, or the one with 3838 nuclides. The shortcomings of existing domestic procedures, such as incomplete nuclide types in the data library and incomplete simulation of the irradiation process, limit the reliability and economy of the safety analysis of spent fuel reprocessing. The nuclide composition was quantitatively verified and analyzed using the measured data of Post-Irradiation Experiments (PIE). The source term calculation accuracy of the program was verified by comparing with the calculation results of the SCALE package, and the impact of different depletion data libraries on the nuclide composition and source term calculation results was also explored. Encouraging conclusions have been drawn from the numerical results. (1) Bamboo-SFuel can accurately analyze the radionuclide composition and radioactive source term of spent fuel assemblies of commercial PWR under different irradiation conditions. (2) The depletion data library with different numbers of nuclides has little influence on the calculation results of important nuclide composition, but has a great influence on the total radioactive source term calculation results. (3) Based on the built-in depletion data library containing 1547 nuclides, this program can simultaneously provide reliable radioactive source analysis of spent fuel and important nuclide composition concerned by radiation safety analysis.