Ihigh crown anti-rotation bolt
AssigneeAreva Np
InventorsBrian Kruse, Brian Ring, Jeff Enneking
Life of this patent
Estimating the term…
Abstract
The present disclosure shows an anti-rotation bolt for fastening reactor plates to prevent subsequent SCC problems wherein the bolt head has a circumferential series of anti-rotation tabs extending from the head of the bolt which are moved in by a restrainer cone which is placed on top of the bolt to allow its insertion into the plates and is removed for locking the tabs into detents formed in one of the plates to provide anti-rotation. The cone is again moved over the tabs during the removal of same leaving the bolt undamaged and fit for reuse.
Claims18
An anti-rotation bolt for fastening together members of a nuclear reactor comprising:
- a threaded shank portion;
- a first head portion attached to said threaded shank portion and having a series of tab members extending there from;
- a second head portion located between said tab members of said first head portion having drive engaging means thereon for torqueing the bolt;
- and
- wherein said tab portions are bendable inwardly to move them out of any engagement with obstructive preventing rotation upon an exerted predetermined force and are returnable to their original position upon removal of said predetermined force.
An anti-rotation assembly having two parts bolted together comprising:
- a first part having a counter-bore section and a threaded section extending down there from with a series of detents formed in the walls of the counter-bore section;
- a second part joined to said first part and having a threaded section aligned with the threaded section of said first part;
- a bolt having a threaded drive section and a head section with a series of flexible tabs extending there from and a drive section for driving said bolt into said first and second parts;
- and
- retaining cone means for preventing said flexible tabs from engaging the detents of said first part when said bolt is being driven into said threaded sections of said first and second part.
Dependencies are inferred from the claim text.