Spacer for fuel rods

Details Spacer for fuel rods Spacer for fuel rods

1986-07-07

1987-09-22

Walsh, Donald P.

Induced nuclear reactions: processes, systems, and elements

Fuel component structure

Plural fuel segments or elements

376442, 376446, 376462, 29400N, 29723, G21C 334

Patent

active

046954260

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.

REFERENCES:
patent: 3405033 (1968-10-01), Widell
patent: 3457140 (1969-07-01), Glandin
patent: 3833471 (1974-09-01), Chetter
patent: 4190494 (1980-02-01), Olsson
patent: 4489038 (1984-12-01), Nylund

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