Xenon oscillation analysis in Monte Carlo burnup calculation

Burnup calculation is one of the core contents in physical analysis of nuclear reactors. In Monte Carlo burnup calculation, power oscillation might occur periodically in certain geometrical dimension and certain step length, namely xenon oscillation. Xenon oscillations might result in a serious deviation from the actual situation. The fundamental reason for the xenon oscillation is that the neutron flux and xenon concentration in the regions of burn-up do not match. According to the mechanism of xenon oscillation, we classify xenon oscillations as physical xenon oscillations produced in short step conditions and numerical xenon oscillations produced in long time step conditions. Balanced xenon oscillation suppression method is forced to balance neutron flux with xenon concentration. In the RMC transport the article uses module a balanced xenon method for the calculation of iodine and xenon. In the RMC transport module, the equilibrium xenon method was used to continuously update the concentration of iodine and xenon. In the case of convergence, the occurrence of xenon oscillation is suppressed. (authors)