Title :
TEM study of radiation induced defects in baffle-former-barrel assembly from decommissioned NPP Greifswald
Author :
Srba, O. ; Michalicka, J. ; Keilova, E. ; Kocik, J.
Author_Institution :
Struct. & Syst. Diagnostics in Centrum Vyzkumu Rez, Rez, Czech Republic
Abstract :
A complex transmission electron microscopy (TEM) study of reactor vessel internal (RVI) materials from the baffle-former-barrel assembly from NPP Greifswald (VVER 440), Unit 1 decommissioned after 15 service cycles has been undertaken. All parts of the baffle-former-barrel assembly are made from Ti-stabilized austenitic stainless steel 08Ch18N10T. The materials were exposed to different dose of neutron radiation (2.4 - 11.4 dpa) at temperatures 267 - 398 °C depending on position in the core. Three types of radiation induced defects were identified and quantified, namely: dislocations, cavities (voids) and fine-scaled precipitated particles of Ni-Si rich phases. Black-dot type defects were observed too. Operation conditions are around ≈ 300 °C that is why we have observed defect typical for both low and high regions of irradiation temperatures.
Keywords :
dosimetry; fission reactor decommissioning; fission reactor operation; neutron effects; nuclear power stations; stainless steel; transmission electron microscopy; 08Ch18N10T; Black-dot type defect; Ni-Si rich phases; TEM study; Ti-stabilized austenitic stainless steel; baffle-former-barrel assembly; decommissioned NPP Greifswald; neutron radiation dose; precipitated particles; radiation induced defect; reactor vessel internal materials; temperature 267 degC to 398 degC; transmission electron microscopy; Cavity resonators; Inductors; Materials; Microstructure; Neutrons; Steel; Temperature; TEM; neutron radiation; reactor vessel internal (RVI);
Conference_Titel :
Advancements in Nuclear Instrumentation Measurement Methods and their Applications (ANIMMA), 2013 3rd International Conference on
Conference_Location :
Marseille
Print_ISBN :
978-1-4799-1046-5
DOI :
10.1109/ANIMMA.2013.6728061
