Spacer for fuel rods
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United States of America Patent
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-
Sep 22, 1987
Grant Date -
N/A
app pub date -
Jul 7, 1986
filing date -
Jul 9, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a spacer arranged to retain and fix elongated fuel rods into bundles insertable into a nuclear reactor fuel assembly, said spacer being of a zirconium alloy having a low neutron absorption. To counteract play and hence wear in case of increasing burnup when the springs relax and the rod diameter is reduced by shrinkage, the spacer is made with different textures in the springs (2, 3) and the surrounding structure (1, 6). The difference in texture gives the springs a great axial irradiation growth and the surrounding structure a small axial irradiation growth, which contributes to a remaining deflection tendency of the springs in relation to the surrounding structure during the life of the fuel assembly.
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