The Effects of irradiation defect distribution and the steel compositions on void denuded zone formations during neutron irradiation and electron irradiation

Sekio, Yoshihiro  ; Yamashita, Shinichiro   ; Sakaguchi, Norihito*; Takahashi, Heishichiro*

The irradiation-induced void denuded zone (VDZ) formation behaviors near grain boundaries were studied in order to clarify the effects of irradiation defect distribution and chemical compositions of steels which were developed to retard their swelling because of the decrease in mobility of point defects during irradiation. The test materials were Fe-15Cr-15Ni model alloy and PNC316 stainless steel which was developed in order to improve the void swelling resistance. These steels were neutron-irradiated in the experimental fast reactor JOYO and electron-irradiated separately using the 1 MeV high voltage electron microscopy (HVEM). The VDZ widths of each steel were evaluated by the TEM microstructural observations after irradiation. From the results in this research, it is considered that VDZ formation would be affected by chemical compositions and that the decrease of VDZ width would be related to increase of the void swelling resistance.