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Reactor coolant pump safety shroud
| Details |
Inventors: Dixon, Larry D.; Payne, Ronald J.; Stafford, II, William H.;
Assignee: Framatome Technologies, Inc. (Lynchburg, VA)
Primary Examiner: Ryznic; John E.
Assistant Examiner:
Attorney, Agent or Firm: Rhodes Coats & Bennett, L.L.P.
A safety shroud of a nuclear reactor coolant pump. Capscrew heads, if broken, are prevented from separating from a nuclear reactor coolant pump having a drive shaft, an impeller secured to the drive shaft, a suction deflector secured to the impeller, and capscrews with outer heads securing the impeller and suction deflector to the drive shaft, by securing a safety shroud over the capscrew heads. The safety shroud may be secured by welding the safety shroud to the impeller or suction deflector, or by bolting the safety shroud to the distal end of the drive shaft. |
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DETAILED DESCRIPTION The present invention is directed to a method and apparatus for repairing reactor coolant pumps, and to the resulting modified pump.
The invention is relates especially to a method and apparatus for remotely modifying such pumps without the need to disassemble the pump and undertake the time consuming and costly bolt replacement steps heretofore required.
The reactor coolant pumps addressed by the present invention are comprised of a casing having coolant inlets and outlets, and an impeller at the distal end of a motor driven drive shaft.
Rotation of the drive shaft rotates the impeller and moves water between the inlet and outlet.
The pump also includes a suction deflector secured to the exterior of the impeller in the direction of the inlet to promote non-turbulent flow.
Capscrews extend through the suction deflector and impeller, and into recesses in a collar around the distal end of the drive shaft to secure the deflector and impeller in position.
Instead of undertaking costly procedures requiring pump disassembly, it has been found that the potential risks associated with breakage of one or more of the capscrews can be reduced by the simple expedient of securing a covering or safety shroud over the suction deflection and capscrew heads, and to the impeller or pump shaft to "catch" the capscrew head if it separates from the bolt body.
In addition, with this solution, attachment of the safety shroud can be made using remote tools carried to the pump through the steam generator manway, resulting in a considerable reduction in costs.
The safety shroud is preferably designed with an annular outer section that has inner and outer peripheral edges, and interior and exterior surfaces corresponding to the exterior surface of the suction deflector.
With this configuration, the interior concave surface of the safety shroud will mate with the convex exterior surface of the suction deflector to provide secure seating, and the exterior convex surface of the safety shroud will produce the same water flow pattern as that provided by the suction deflector
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