Simulation of Full-core pin-by-pin Model by JMCT Monte Carlo Neutron-photon Transport Code

Due to the number of cell over ten millions, the count over billion and the particle mumber over ten billions, the pin-by-pin problem of the full reactor core has become as a challenge for the computers and the computational methods. Since the large memory demand has exceeded the limit of a single CPU, the spatial domain and data decomposition must be considered. JMCT 3-D Monte Carlo neutron and photon transport code which was developed based on the real body combinational geometry toolbox JCOGIN successfully fulfilled the simulation of full-core pin-by-pin model from Dayawan Nuclear Power Station by spatial domain decomposition and the nested parallel computation. The fluence rate distribution and standard deviation of each pin were obtained.