Nuclear fuel element nut retainer cup tool

Details Nuclear fuel element nut retainer cup tool Nuclear fuel element nut retainer cup tool

1977-04-22

1979-09-04

Smith, Al Lawrence

Metal working

Means to assemble or disassemble

Overedge assembling means

81 10, B23P 1100, B25B 2700

Patent

active

041663136

ABSTRACT:
A typical embodiment has an end fitting for a nuclear reactor fuel element that is joined to the control rod guide tubes by means of a nut plate assembly. The nut plate assembly has an array of nuts, each engaging the respective threaded end of the control rod guide tubes. The nuts, moreover, are retained on the plate during handling and before fuel element assembly by means of hollow cylindrical locking cups that are brazed to the plate and loosely circumscribe the individual enclosed nuts. After the nuts are threaded onto the respective guide tube ends, the locking cups are partially deformed to prevent one or more of the nuts from working loose during reactor operation. The locking cups also prevent loose or broken end fitting parts from becoming entrained in the reactor coolant. A tool for selectively locking and unlocking the nuts is presented.

REFERENCES:
patent: 3653802 (1972-04-01), Weiss
patent: 3722329 (1973-03-01), Van Hecke et al.

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