16 / 37
Page 97
Nano Research & Applications
ISSN 2471-9838
E u r o S c i C o n C o n f e r e n c e o n
Nanotechnology &
Smart Materials
O c t o b e r 0 4 - 0 6 , 2 0 1 8
Am s t e r d a m , N e t h e r l a n d s
Nanotechnology & Smart Materials 2018
Discovery of the oscillations in the RPV steel radiation
embrittlement kinetics as an indication of nanostructure self-
organizing and smart behavior
E Krasikov
National Research Centre “Kurchatov Institute”, Russia
I
nfluence of neutron irradiation on reactor pressure vessel (RPV) steel degradation are examined with reference to the
possible reasons of the substantial experimental data scatter and furthermore nonstandard (non-monotonous) and oscillatory
embrittlement behaviour. In our glance, this phenomenon may be explained by presence of the wavelike recovering component
in the embrittlement kinetics. We suppose that the main factor affecting steel anomalous embrittlement is fast neutron intensity
(dose rate or flux); flux effect manifestation depends on state-of-the-art fluence level. At low fluencies radiation, degradation has
to exceed normative value, then approaches to normative meaning and finally became sub normative. In our opinion, controversy
in the estimation on neutron flux on radiation degradation impact may be explained by presence of the wavelike component in
the embrittlement kinetics. Therefore, flux effect manifestation depends on fluence level. At low fluencies, radiation degradation
has to exceed normative value, then approaches to normative meaning and finally became subnormative. As a result of dose,
rate effect manifestation peripheral RPV’s zones in some range of fluencies have to be damaged to a large extent than situated
closely to reactor core. Moreover, as a hypothesis, we suppose that at some stages of irradiation, damaged metal have to be
partially restored by irradiation i.e. neutron bombardment. Nascent during irradiation nanostructure undergo occurring once or
periodically transformation in a direction both degradation and recovery of the initial properties. According to our hypothesis at
some stage(s) of metal structure, degradation neutron bombardment became recovering factor. Self-recovering section of RPV
steel radiation embrittlement kinetics is an indication of material nanostructure self-organizing and smart behavior.
ekrasikov@mail.ruNano Res Appl Volume:4
DOI: 10.21767/2471-9838-C6-025