Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9793586 | Journal of Nuclear Materials | 2005 | 9 Pages |
Abstract
Fission gas release in FBR MOX fuel pins irradiated to high burnup was studied as a function of burnup. Fuel pellets of different microstructures were fabricated by three methods. The pin averaged burnup of fuel pins ranged from 5.8 to 144Â MWd/kgM. The fission gas release mechanism was investigated from results of the puncture test, microstructure observations and EPMA analyses. The fission gas release increased with the increase of burnup. But it depended on the microstructure of as-fabricated fuel below a burnup of 70Â MWd/kgM. The difference in fission gas release among fuel pellets of different microstructures, could be attributed to fission gas which was retained in the large size pores of the as-fabricated fuel. In the fuel pin irradiated beyond burnup of 100Â MWd/kgM, the fission gas release fraction was significantly large (nearly 80%), and independent of the burnup, the kinds of pellets and LHR. This indicated that little capacity for retention of fission gas is expected in the fuel irradiated to the burnup beyond 100Â MWd/kgM and this should be considered in the FBR fuel pin design.
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
Koji Maeda, Kozo Katsuyama, Takeo Asaga,