Bolt with integral locking member

Details Bolt with integral locking member Bolt with integral locking member

1999-08-24

2000-12-26

Saether, Flemming

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Threaded fastener locked to a discreet structure

Nut, and means to engage substructure on its opposite faces...

411183, 411271, 411972, F16B 3900

Patent

active

061648868

ABSTRACT:
A high strength bolt fastens a baffle plate and a former plate of a pressurized water nuclear reactor pressure vessel together. The bolt has a head portion and an integral locking member extending from the head portion for engaging one of the structural members to lock the bolt with the structural member. The integral locking member portion has a lower yield stress than the yield stress of the shank. A lower yield stress may be obtained by selective annealing. The locking member is less susceptible to stress corrosion cracking in high temperature, high pressure water of commercial nuclear power reactors.

REFERENCES:
patent: 3726553 (1973-04-01), Reynolds
patent: 4089247 (1978-05-01), Dahl
patent: 4448561 (1984-05-01), Le Pargneux
patent: 4506418 (1985-03-01), Viola
patent: 4683108 (1987-07-01), Balog
patent: 4828441 (1989-05-01), Frasca
patent: 4905546 (1990-03-01), Katscher
patent: 5076149 (1991-12-01), Everts
patent: 5771266 (1998-06-01), Fabris
Christian Hillrichs, Replacement of Bolts in RPV Internals, Procedures and Performance Planning Department in the KWU Reactor Service Division, pp. 18-23, Sep. 1987.

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