The experimental data comprising more than 1800 data points on swelling of fuel pin cladding specimens of cold worked austenitic steel 16Cr-15Ni-2Mo-1Mn irradiated in the BN-600 reactor are described by the equation S = Rs∙(D-D0)∙(1-exp(-p(D-D0))). Where S = swelling; D = damage dose; D0, p and Rs are parameters depending on irradiation temperature and damage dose rate.
The parameters of the equation were obtained at 40–90 dpa in the temperature range of 400 – 600 °C. Their dependencies on neutron irradiation temperature and radiation damage rate were then examined.
The dependence of swelling on neutron irradiation temperature for different values of damage dose was calculated using the derived temperature dependencies of the equation parameters. The temperature at which maximum swelling is observed was shown to increase with increasing dose in the selected model. An overview of the swelling temperature dependence on changes in the character of the equation parameters was also conducted.