Monte Carlo simulation research on damage mechanism of typical metal engineering materials in nuclear reactor under irradiation

• 1、Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering, Department of Nuclear Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016

Abstract：Maintaining the safety and reliability of nuclear engineering materials under a neutron irradiation environment is significant. In this paper, the model of material damage under irradiation of reactor was established using the Monte Carlo package Geant4. The irradiation damage mechanisms of CLAM, F82H and α-Fe under the bombardment of neutrons, protons and heavy ions were studied respectively with the aspects of material displacement damage rate and impurities deposition. The results have shown that irradiation damage caused by neutrons was mainly displacement damage. The distribution of displacement damage caused by protons and heavy ions corresponded to Bragg peak curve, whose incident depth and damage area were concentrated in the surface of material. 14.67 MeV protons had an incident depth of 512 μm while 0.82 MeV 3He ions were 2.1 μm only. The damage forming mechanism of metal engineering materials under extreme irradiation environment was systematically analyzed, which provided a theoretical basis for further research of material changes in macroscopic properties and microstructure after irradiation.

Keywords： nuclear technology and application Monte Carlo method metal engineering materials displacement damage rate impurities deposition