Method of installing a sleeve within an instrumentation tube of

Details Method of installing a sleeve within an instrumentation tube of Method of installing a sleeve within an instrumentation tube of

1987-04-22

1988-06-14

Kyle, Deborah L.

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

Fuel component

376254, 376352, 376446, 29400N, 294011, 29523, G21C 1710

Patent

active

047510390

ABSTRACT:
A spacer sleeve is installed within an instrumentation tube of a nuclear fuel assembly comprising two end nozzles connected by tie rods and a plurality of fuel rod supporting grids distributed at axial intervals along the tie rods. The instrumentation tube has a first end received in an initially blind bore formed in one of the end nozzles and communicating with the outside by a coolant restriction. An opening having a diameter equal to that of said sleeve and connected to the bore by a shoulder is machined in the end nozzles; a sleeve is inserted into the instrumentation tube through the opening; the sleeve is centered within said instrumentation tube by locally expanding it into contact with the instrumentation tube at a plurality of locations each in one of said intervals; a cap is introduced into the sleeve having a radial end collar dimensioned for abutting connection against said sleeve, a deformable lateral skirt and a bottom wall formed with a coolant flow orifice of predetermined cross-sectional area; and the sleeve is secured within the nozzle by simultaneously expanding radially the skirt and the sleeve against the shoulder.

REFERENCES:
patent: 4614636 (1986-09-01), Walters
patent: 4617171 (1986-10-01), Feutrel
patent: 4641409 (1987-02-01), Shallenberger et al.
patent: 4663119 (1987-05-01), Kerrey
patent: 4684498 (1987-08-01), Paul

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