Transactions of the Korean Nuclear Society Spring Meeting, Taebaek, Korea, May 26-27, 2011
The displacement per atom (DPA) plays a role as a unit of neutron irradiation damage in neutronic calculations. However, DPA itself does not contain any information about the target material in terms of mechanical property change. Recent progress in coarse grain methods enables to estimate the relationship between DPA and mechanical property change of the target material. For example, the kinetic Monte Carlo (kMC) is one of the coarse grain methods which can be used for this purpose. The kMC can measure DPA regardless of neutronic calculation and provide a relationship between DPA and densities of defects induced by the collision between an impinging neutron and lattice atoms. The existing kMC codes used in irradiation damage calculation, such as BIGMAC or LAKIMOCA package, JERK use a total neutron flux, which is calculated by a neutronic code to calculate DPA depending on the kind of irradiation that is simulated. However, the use of neutron flux as an input parameter of kMC does not satisfy the condition for consistency of DPA calculation between neutronics and kMC. In this paper, a condition for satisfying the consistency in terms of DPA between transport MC (tMC) and kMC is derived
