Research on Monte Carlo-Neutron Point Kernel Integration Method Coupling Calculation Method of Neutron Radiation Field

Abstract Nuclear-powered icebreakers are the future development direction of icebreakers. Due to the fact that icebreakers operate far away from land, the emergency rescue response after a nuclear accident is long and difficult. Therefore, rapid and accurate calculation of the neutron dose in the reactor radiation field is crucial for emergency response to nuclear accidents. This paper coupled the point kernel integration with the Monte Carlo method, and developed a coupled calculation program based on the coupling method. And on the basis that the point kernel program can realize neutron dose calculation, a point kernel program that can be run in parallel was designed to speed up the operation. A single-body source scenario was firstly designed to validate the coupling program. Compared with the results of the Geant4 toolkit, the relative deviations of the coupling program for the calculation of neutron dose are 5%, and the computation time was saved by nearly 90%, which indicates that the coupling calculation program is more efficient in the computation. A computational analysis of the radiation field in the reactor compartment has been carried out on the example of the Russian nuclear-powered icebreaker Arktika. The results show that the coupled computational method takes 10% of the computation time of the Geant4 toolkit under the same computational conditions, and the maximum relative deviation of the computational results does not exceed 20%, which demonstrates the applicability of the coupled calculation method in the complex radiation field in the reactor compartment of the nuclear-powered icebreaker.