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A complex research of RPV 15Kh2NMFA class 1 steel in different states was performed: in the initial state and after irradiatiion at different temperatures (50-300∘C). Low temperature (50-140∘C) irradiation was shown to cause the formation of dislocation loops of ultrahigh density. At the same time radiation-induced precipitates, being the main radiation-induced hardening phase at irradiation temperature of VVER reactors (∼300∘C), were absent. This leads to a higher radiation embrittlement rate after low-temperature irradiation as compared with irradiation at operating temperatures of VVER-1000. The radiation embrittlement coefficient values are 8.7 and 1.45 for (120-140)∘C and (290-315)∘C irradiation temperature, respectively.

The Effect of Reducing Irradiation Temperature on the Structure and Radiation Embrittlement Mechanism of RPV Steels