Reactor jet pump plugs
Patent 4043705 Issued on August 23, 1977. Estimated Expiration Date: 
August 23, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 23, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 273652 3838002 3927860 InventorApplicationNo. 05/634426 filed on 11/24/1975US Classes:417/151, Jet239/578, Relatively movable remotely arranged operator for controller (e.g., Bowden wire)251/299, Terminal376/277, REACTOR PROTECTION OR DAMAGE PREVENTION417/176, Parallel entrainments with separate combining tubes417/313COMBINEDExaminersPrimary: Freeh, William L.Assistant: Look, Edward K. Attorney, Agent or FirmAbstractThe invention provides a tool for closing off the jet nozzles of jet pumps located in an almost inaccessible location inside the shell of a boiling water reactor. The tool suspended on a cord is lowered down through a narrow gap extending down along the major part of the shell of the reactor, a distance of approximately 30 feet. The tool is lowered onto a stationary projection--namely, a lug or ear--which provides a gauge point for height and lateral position and an anchorage for torque in a horizontal plane. With these two controls for the tool of the invention, a closure for the jet nozzle may be applied to each of the jet nozzles to close them off against outflow of the water contained in the shell of the reactor thereby avoiding the bleak alternative of taking the reactor completely out of service, which includes removing the fuel bundles and draining the shell. | |
