Change of fuel-to-cladding gap width with the burn-up in FBR MOX fuel irradiated to high burn-up |
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Authors: | Koji Maeda Takeo Asaga |
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Affiliation: | Fuels and Materials Division, O-arai Engineering Center, Japan Nuclear Cycle Development Institute, 4002 Narita, O-arai-machi, Ibaraki 311-1393, Japan |
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Abstract: | In order to study the dependence of the gap width change on the burn-up, the fuel-to-cladding gap widths were investigated by ceramography in a large number of FBR MOX fuel pins irradiated to high burn-up. The dependence of gap widths on the burn-up was closely connected with the formations of JOG (joint oxyde-gaine) and rim structure. The gap widths decreased gradually due to the fuel swelling until ∼30 GWd/t, but beyond this burn-up the dependence showed two different tendencies. With the increase of burn-up, the gap widths decreased due to the increase of fuel swelling in the low fuel temperature region where the rim structure was observed, but they increased in the high fuel temperature region where the JOG rich in Cs and Mo formed in the gap. |
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Keywords: | F0200 F0700 N0100 P0700 U0200 |
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