A Kinetic Study of Clusters Evolution under VVER-type Reactor Condition

The evolution of copper rich clusters and vacancy clusters in the neutron irradiated VVEER steels is investigated beginning at the nucleation stage. For this, typical VVER-type reactor conditions are considered. Cluster dynamics approach is used for calculation of the size distribution function, mean radius, number density of copper precipitates and the concentration of free Cu-atoms in dependence on the irradiation time. The results for time of one year are compared with the results of small angle neutron experiments which were carried out at specimens irradiated at surveillance position of VVER reactors.