Fuel assembly with easily detachable components

Details Fuel assembly with easily detachable components Fuel assembly with easily detachable components

1975-12-22

1977-08-30

Bentley, Stephen C.

176 79, G21C 330, G21C 310

Patent

active

040452875

ABSTRACT:
A fuel assembly includes a bundle of vertical fuel rods. Some of the rods are tying rods provided with extended upper end plugs, and the rest of the rods are spring-furnished ones, the spring forces balancing the tying forces exerted by the tying rods between a top plate and a bottom plate. The top plate is grid-like and provided with attachment holes for the upper end plugs. The lower end plugs of the tying rods are screwed in threaded holes in the bottom plate. Each of the upper end plugs of the tying rods has a portion located above the top plate and provided with a nut. Rotation of the nut is limited by at least one downwardly directed projection on the nut, the end surface of which lies below the upper edge of the top plate. The maximally allowable length of this projection is less than the maximum shortening of the springs that can be carried out by exerting a downwardly directed force on the top plate. With such a projection length the projections can clear the side and the nut can be rotated and removed.

REFERENCES:
patent: 1484402 (1924-02-01), Martin
patent: 3431170 (1969-03-01), Lass
patent: 3775249 (1973-11-01), Clapham

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