Abstract
Pressurized tube specimens of Japanese Ferritic-Martensitic Steel (JFMS) were irradiated in Fast Flux Test Facility (FFTF) Materials Open Test Assembly (MOTA) to 37.5 dpa at 680 and 793 K. Diametral creep strain following irradiation at 680 K was 0.11% even at zero hoop stress and slightly increased with increasing the hoop stress. The creep strain following irradiation at 793 K increased from zero to 0.23% with the increase in hoop stress from zero to 86 MPa. As for the void swelling, nothing was recognized. The martensitic phase in JFMS was stable after the irradiation at 680 K, but this was not the case at 793 K where a considerable recovery of dislocation structures was found
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