Reactor internals through-hole grapple
This patent describes an improved reactor internals lifting rig including a reactor internals through-hole grapple device for lifting and transporting an internals structure of a nuclear reactor, the internals structure including a radial flange thereon having a top and bottom surface with a plurality of holes therebetween. It comprises: a generally vertically disposed cylindrical housing adapted to be secured to the lifting rig; a generally vertically oriented grapple assembly having its upper end partially disposed within the housing and the lower and projecting substantially below the housing and the lifting rig; the lower end of the grapple assembly having an outwardly directed annular shoulder with an upper surface thereon which is adapted to pass through one of the holes and adjacent to the bottom surface of the radial flange, the grapple assembly having a retracted position and an expanded position wherein when in the retracted position the annular shoulder is smaller in diameter than the hole and when in the expanded position the annular shoulder is larger in diameter than the hole such that the upper surface of the annular shoulder is in abutting contact with the bottom surface of the radial flange of the internals structure.
- Assignee:
- Westinghouse Electric Corp., Pittsburgh, PA (USA)
- Patent Number(s):
- US 4919881; A
- Application Number:
- PPN: US s 7-215116; TRN: 90-031565
- OSTI ID:
- 6564194
- Resource Relation:
- Patent File Date: 5 Jul 1988
- Country of Publication:
- United States
- Language:
- English
Similar Records
Slack adjustment for slip system in downhole well apparatus
Ceiling fan