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Investigation of irradiated metal of WWER-type reactor internals after 45 years of operation. Part 3. Microstructure and phase composition
https://doi.org/10.22349/1994-6716-2020-103-3-157-180
Abstract
TEM, SEM, and APT techniques have been used to analyze radiation-induced components of metal structure of fragments cut from the pressure vessel internals of Novovoronezh NPP Unit No 3 after 45 years of operation. The fragments differed in the neutron damaging doses (from 14 to 43 dpa) and the irradiation temperature (from 285 to 315°C). The density and dimensions of titanium carbides and carbonitrides, dislocation loops, radiation-induced voids, segregations, and nanoscale precipitates were determined. The contributions of structural components to the radiation hardening of the investigated fragments of 18Cr-10Ni-Ti stainless steel were estimated.
Supporting agencies: This article has been written as a result of summarizing studies carried out under the project No 375123 “Investigation of the standard mechanical properties and structure integrity characteristics of the base metal and weld metal of the elements of Unit 3 of the Novovoronezh NPP to provide R&D on material science justification of operation life prolongation of equipment of WWER-440 NPP to 60 years”, funded by JSC Concern Rosenergoatom.
About the Authors
E. A. Kuleshova
NRC “Kurchatov Institute”; NRNU “MEPhI”
Russian Federation
Russian Federation
Dr Sc. (Eng)
1 Akademika Kurchatova Sq, 123182 Moscow
31 Kashirskoe shosse, 115409 Moscow
S. V. Fedotova
NRC “Kurchatov Institute”
Russian Federation
Russian Federation
Cand Sc. (Eng)
1 Akademika Kurchatova Sq, 123182 Moscow
B. A. Gurovich
NRC “Kurchatov Institute”
Russian Federation
Russian Federation
Cand Sc. (Eng)
1 Akademika Kurchatova Sq, 123182 Moscow
A. S. Frolov
NRC “Kurchatov Institute”
Russian Federation
Russian Federation
Cand Sc. (Eng)
1 Akademika Kurchatova Sq, 123182 Moscow
D. A. Maltsev
NRC “Kurchatov Institute”
Russian Federation
Russian Federation
Cand Sc. (Eng)
1 Akademika Kurchatova Sq, 123182 Moscow
B. Z. Margolin
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
Dr Sc. (Eng)
49 Shpalernaya St, 191015 St Petersburg
A. J. Minkin
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
49 Shpalernaya St, 191015 St Petersburg
Russian Federation
49 Shpalernaya St, 191015 St Petersburg
A. A. Sorokin
NRC “Kurchatov Institute” – CRISM “Prometey”
Russian Federation
Russian Federation
Cand Sc. (Eng)
49 Shpalernaya St, 191015 St Petersburg
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For citations:
Kuleshova E.A., Fedotova S.V., Gurovich B.A., Frolov A.S., Maltsev D.A., Margolin B.Z., Minkin A.J., Sorokin A.A. Investigation of irradiated metal of WWER-type reactor internals after 45 years of operation. Part 3. Microstructure and phase composition. Voprosy Materialovedeniya. 2020;(3(103)):157-180. (In Russ.) https://doi.org/10.22349/1994-6716-2020-103-3-157-180
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