Abstract
A speed-up method of a neutron kinetic model was studied. The neutron kinetic model is a on e-energy group three-dimensional (3D) neutron kinetic model that uses a finite-differential method. External neutron sources can be considered by the 3D neutron kinetic model to simulate the reactor start-up of initially subcritical condition. To speed up the neutron calculation, we have applied the odd-even method, also known as the checkerboard ordering method, to the time-dependent 3D neutron diffusion calculation. The number of iterations needed for convergence was decreased using the method. The odd-even method was validated by a simulation of the advanced boiling water reactor (ABWR) transient e vent of the main steam isolation valve closure. The num ber of neutron diffusion calculation iterations was decreased to 47% of the number needed by a general method. The calculation time of a 100s simulated period was 67s using an ordinary PC.
