Convergence characteristics and acceleration of the transient fixed source equation solved by Monte Carlo method

The safety analysis of nuclear systems such as reactors requires transient calculation. Monte Carlo (MC) method has grown rapidly in recent years because its high-fidelity modelling and simulation capability. predictor-corrector quasi-static (PCQS) MC been investigated for kinetic However, the approach to shorten computational time required solve fixed source equation (TFSE) is still under development. convergence characteristic neutron iteration algorithm PCQS analyzed this study with a simplified model. It found that rate governed by effective spectral radius (ESR). lower ESR is, faster is. In order reduce ESR, asymptotic superhistory (ASM) developed RMC code. performance ASM evaluated C5G7-TD benchmark. Results show reduction number inactive cycles more than 85%, over 15% including active saved. demonstrated how speeds up iterations using Wasserstein distance measure.