Safety Monitoring of Materials and Components of Nuclear Power Plants

摘要: Cluster dynamics (CD) is used to study the evolution of size distributions vacancy clusters (VC), self-interstitial atom (SIA) (SIAC) and Cr precipitates in neutron irradiated Fe-9at.%Cr Fe-12.5at.%Cr alloys at T = 573 K with irradiation doses up 1.5 dpa a flux 140 ndpa/s. Transmission electron microscopy (TEM) small angle scattering (SANS) data on defect structure this material 0.6 are calibrate model. For both saturation behavior has been found by CD for free SIA concentrations as well number density SIAC above 0.006 dpa. The simulations also indicate presence VC radii less than 0.5 nm strong peak mean diameter about nm, invisible SANS TEM experiments. modeling made taking into account deviation system from ideal cluster gas. A specific surface tension 0.17 J/m2 between α matrix Cr-rich α′ precipitate rate which monomers absorbed 7.94 m−1 have best fit values reproducing long-term Fe-12.5%Cr observed SANS. change composition Fe-Cr due found.