Expandable top nozzle and device for securing same to a nuclear

Details Expandable top nozzle and device for securing same to a nuclear Expandable top nozzle and device for securing same to a nuclear

1994-08-30

1995-12-26

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Reactor structures

Circulating fluid within reactor

376446, G21C 506

Patent

active

054794641

ABSTRACT:
An expandable top nozzle for a nuclear fuel assembly having zircaloy thimble tubes has a cylindrical barrel and an assembly slidable in the barrel which includes a hub and a thin rod ejection plate fixed in spaced relation to the hub by support tubes through which the control rods extend. The support tubes extend through the hub and a spring retainer plate biased against an annular shoulder in the barrel by helical compression springs concentrically mounted with the support tubes in counterbores in the hub and spring retainer plate. A centrally located instrument guide robe has a spring loaded plunger which extends through the spring retainer plate and sets the height of an RCCA below the top of the barrel despite expansion and compression of the nozzle with changes in thimble robe length relative to the other internals. The top nozzle is removably attached to a fuel assembly by tubular inserts fixed to the thimble robes and having collapsed fingers with an annular outward bulge adjacent the free end. With the collapsed fingers inserted in the apertures in the rod ejection plate, lock tubes are pushed through the support tubes to spread the collapsed fingers of the inserts into engagement with circumferential grooves in the apertures.

REFERENCES:
patent: 4534933 (1985-08-01), Gjersten et al.
patent: 4641409 (1987-02-01), Shallenberger et al.
patent: 4687619 (1987-08-01), Wilson et al.
patent: 4687630 (1987-08-01), Gjertsen et al.
patent: 4702882 (1987-10-01), Stucker
patent: 4986959 (1991-02-01), Sparrow et al.

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