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Swelling behaviors in a fuel assembly for the wrapping wire and duct made of modified 316 austenitic stainless steel

Yamagata, Ichiro ; Akasaka, Naoaki

The swelling behaviors in wrapping wire and duct were investigated for a fuel assembly made of modified type 316 austenitic stainless steel irradiated in a fast breeder reactor. The temperature dependence of swelling varied because the peak temperatures of swelling in the wrapping wire and the duct were different. The void distribution in the material was observed by scanning electron microscopy and transmission electron microscopy and it was confirmed that the voids grew within an area of about 100 $$mu$$m from the surface. This phenomenon seemed to be caused by a surface effect on the neutron-irradiated materials.

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Category:Nuclear Science & Technology

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