Measurement of keff with Neutron Flux Distribution Method Based on MC Simulation

Abstract

In this work, the neutron flux distribution method to determine the effective multiplication coefficient keff has been numerical analysis by MCNP program. The neutron flux distribution of four multi-sphere system models are calculated, and the characteristic parameter c of each system are fitted with keff, so as to measure the keff of multi-sphere system. And experiment based on reactor system has been carried out to prove the method. Experiment results show that the keff obtained by the neutron flux distribution method are consistent with the experimental measurement results, indicating that the method is feasible and reliable.