Source: https://nuclear-power-engineering.ru/en/article/2017/01/06/
Timestamp: 2019-04-22 01:11:01+00:00

Document:
Radiation-induced swelling has a negative influence on the structural unit availability of the fast neutron reactor core. Therefore if to reduce swelling it is an important task to search for new steels and improve known ones.
Since 2003 the 16Cr-15Ni-2Mo-Mn-Ti-V-B steel shows a significant increase in radiation resistance as a result of the improvement of composition and heat treatment. The swelling of 16Cr-15Ni-2Mo-Mn-Ti-V-B improved steel is studied with JSC INM’s forces. The data about the maximum swelling temperature and the average speed of swelling in typical temperature ranges of the coolant and the dose rate of fast reactor was obtained.
Research materials are based on the results of hydrostatic weighing and transmission microscopy measurements of steel samples density and swelling. Specific matters of hydrostatic measurement errors were discussed considering metallography data and immersion liquid choice.
It was found that the average swelling rate of 16Cr-15Ni-2Mo-Mn-Ti-V-B improved steel under maximum swelling characteristic temperature is within the range of 0,04 – 0,14 %/dpa. There is a tendency of the characteristic temperature shift from 460 to 520°С as maximum damage dose increases from 60 to 80 dpa (1,3⋅10–6 and 1,7⋅10–6 dpa/s respectively). At low (less than 10 dpa) damage doses and minimum (less than 400°С) temperatures the swelling rate can reach 0,04 %/dpa. High-temperature metal corrosion causes hydrostatic measurement errors. According to the electron microscopy data, at temperature about 600°С and damage dose below 50 dpa, swelling rate does not exceed 0,01 %/dpa throughout the whole observation period.
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