THE SECOND SAUDI INTERNATIONAL CONFERENCE ON NUCLEAR POWER ENGINEERING (SCOPE-2)

This work evaluates the use of different spallation-generated neutron sources in a hybrid ADS-fission based on the SEALER reactor to study the transmutation of nuclear waste. Five targets (Lead, Pb-Bi Alloy, Mercury, Tungsten and Natural Uranium) irradiated by 1 GeV protons were simulated, and the neutron spectra generated were inserted into the reactor model. The SEALER reactor was modified to operate as a hybrid ADS-fission system, with an external neutron source in the center. The study analyzed four types of reprocessed fuels with transuranic actinides mixed with thorium or depleted uranium, in the form of oxides and nitrides. Simulations with the SERPENT code allowed comparing the performance of the different spectra concerning actinide transmutation, generation of new isotopes, and changes in fuel composition over time.