ICONE23-1068 CALCULATION OF KINETIC PARAMETERS FOR ADS CORES WITH MINOR ACTINIDES BY USING MONTE CARLO METHOD

Abstract

The most important kinetic parameters are effective delayed neutron fraction (β_<eff>), mean neutron generation time (Λ) and reactivity coefficient (α), which play a key role in nuclear reactor control and safety analysis. In this work, these kinetic parameters for the accelerator driven system (ADS) cores are calculated by using Monte Carlo method. The calculated values of βeff and Λ agree well with the reference data. In addition, the effect of minor actinides (MA) on kinetic parameters is investigated. Both uranium and plutonium mixed oxides (MOX) fuel and (U,Pu,MA)O_2 fuel are taken into account to load in the different cores. The results show that the values of β_<eff> and Λ decreases with increasing the content of MA in the (U,Pu,MA)O_2 fuel. The results also demonstrate that prompt negative feedback effects, including Doppler feedback effect and Coolant feedback effect, would be weakened after loading a large amount of MA into the core.