Study on kinetic parameters of pebble bed reactor with TRISO duplex fuel

Thorium, in this case, 232Th has a higher thermal neutron capture cross-section than 238U, which means that more fertile isotopes can be transmuted and could lead to fissile isotope 233U. In addition, 233U good performance the spectrum. Theoretically, nuclear reactor using thorium fuel also last longer one uranium fuel. The use of TRISO duplex is predicted produce better neutronic behavior pebble bed reactor. This work aims study kinetic parameters with configuration consists an inner region filled UO2 particles outer ThO2 surrounded by graphite matrix pebble. Three configurations volume fraction UO2-ThO2 were considered study: 80-20 %, 75-25 70-30 %. HTR-10 was chosen as model because its geometry material specifications are known. A series calculations conducted Monte Carlo transport code MCNP6 ENDF/B-VII.1 data library. calculation results then analyzed investigate effect compositions on various packing fractions 1-50 It concluded utilization significantly affect core multiplication factor caused increase Th content. On other hand, taking part moderation since lower for fueled