High burnup nuclear fuel rod

Details High burnup nuclear fuel rod High burnup nuclear fuel rod

1979-03-23

1981-06-16

Nelson, Peter A.

176 76, G21C 302

Patent

active

042736161

ABSTRACT:
A nuclear fuel assembly having an improved fuel rod of the type having a column of hollow pellets. A plurality of spacer plugs are interposed between proximate pellets at selected elevations along the fuel rod in order to trap pellet debris that would otherwise fall through the passage in the center of the column and accumulate at the bottom of the fuel rod. Thus, an undesirable power peak at the bottom of the fuel rod is avoided. In the preferred embodiment, the plugs are located at the same elevations as the fuel assembly grids, where the local flux is lowest and the effect of the plugs on the power distribution is minimized. The plugs could be made from any material, but graphite or a low enrichment UO.sub.2 pellet are preferred.

REFERENCES:
patent: 3352757 (1967-11-01), Dee et al.
patent: 3378457 (1968-04-01), Davidson et al.
patent: 3519537 (1970-07-01), Ferrari
patent: 3816248 (1974-06-01), Cayol et al.
patent: 4121972 (1978-10-01), Steven

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