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Registration Number

0213U007382, 0112U008054 , R & D reports

Title

Theoretical assessment and computer modeling of micromechanisms of radiation strengthening of pressure vessel metal of the water-water energetic reactors

Head

Dubinko Volodymyr Ivanovich,

Registration Date

08-10-2013

Organization

National Science Center "Kharkov Institute of Physics & Technology" National Academy of Science, Ukraine

Description

Interrelation between contributions of radiation-induced DL and precipitate to irradiation hardening of RPV metal for WWER-1000 and WWER-440 is established. It is shown that for RPV metal of WWER-1000, irradiation hardening due to DL dominates over the whole investigated range of fluences (till 16 1023 neutron/m2). For RPV metal of WWER-440, such domination is observed at fluences greater than [40 50] 1023 neutron/m2. It is exhibited that irradiation hardening due to DL is characterized by monotonic increase in strength with fluence growth, whereas hardening due to precipitates has an explicit maximum on the dependence of increase in strength on fluence, which is it specific feature. For investigated RPV steel of WWER-1000, above maximum is observed at fluence 40 1023 neutron/m2. To predict the value of irradiation hardening over the wide fluence range, and to ascertain relation between micro-structural evolution under irradiation and regularities of irradiation hardening, computer simulation of formation and growth of vacancy and interstitial DL in RPV metal was executed in this work under conditions of irradiation hardening typical for WWER-1000 and WWER-440; nucleation and growth of precipitate were simulated as well. Data on fluence dependence of the average values of DL diameters and bulk density was got, which agrees well with experimental evidence for both BM and WM of WWER-440 and WWER-1000. It enabled to obtain prognosis curves of change in these key parameters of radiation-induced defects at over-service-life fluences.

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Грицина Віктор Михайлович
Дубінко Володимир Іванович