1977-06-28
1979-04-03
Nelson, Peter A.
176 68, G21C 308
Patent
active
041475917
ABSTRACT:
This invention relates to fuel assembly for Fast Breeder Reactor, such as wire spacer fuel assembly, in which the thickness of cladding tubes in the upper end portion of fuel pins positioned in the peripheral region of the assembly is made larger than that of the remaining portion. Thus, according to the present invention, a bundle of the fuel pins can be restrained from displacement in one direction in the assembly when the fuel pins are deformed by heat and neutron radiation in operation of a nuclear reactor, and further the sectional portion of the fuel pins can be prevented from deformation caused by a load externally operated on the fuel pins. Furthermore, the thickness of the cladding tubes can be prevented from reduction caused by fretting corrosion which is caused by the contact of the cladding tubes with a wrapper tube.
REFERENCES:
patent: 3607642 (1971-09-01), Murdock et al.
patent: 3930940 (1976-01-01), Cayol et al.
patent: 3964968 (1976-06-01), Kurilkin et al.
patent: 3997395 (1976-12-01), Cayol et al.
patent: 4038137 (1977-07-01), Pugh
Hitachi , Ltd.
Nelson Peter A.
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