Abstract: An anti-rotation device for preventing separation of a valve stem and valve disc(s) in a gate valve in a nuclear reactor power plant of the type where connection means, such as a wedge or disc hub, is threadedly engaged by the valve stem to actuate the valve and a method for maintenance or repair of the valve without disassembly of the valve or removal of the valve actuator.

Abstract: An anti-rotation device for preventing separation of a valve stem and valve disc(s) in a gate valve in a nuclear reactor power plant of the type where connection means, such as a wedge or disc hub, is threadedly engaged by the valve stem to actuate the valve and a method for maintenance or repair of the valve without disassembly of the valve or removal of the valve actuator.

Abstract: A gun-launched, penetrating anchor projectile includes a dense, metallic, elongated penetrator having a central bore extending forward from its aft end. An expandable anchor in the form of a hollow cylinder is disposed aft of the penetrator. A spacer and hammer in the form of hollow cylinders are disposed aft of the anchor. A guide tube is disposed radially inward of the anchor, the spacer and the hammer. A semi-rigid cable has one end fixed in the central bore of the penetrator and extends aft through hollow interiors of the expandable anchor, the spacer, and the hammer. The other end of the cable forms a loop on which a pulley is mounted. A discarding sabot and fin assembly are disposed around the projectile.