Radiation embrittlement of support structure materials for WWER RPVs

The experimental date on standard mechanical properties and fracture toughness have been obtained for various steels and weld metals in the initial and irradiation conditions. SEM investigation of fracture surface of fractures toughness specimens and investigation with atomic-tomography method have been performed. The model for prediction of material radiation embrittlement as a function of the neutron fluence and the impurity (Cu and P) content is developed. The irradiation temperature effect is considered on various mechanisms of radiation embrittlement of a material.