Reactor internals through-hole grapple

Details Reactor internals through-hole grapple Reactor internals through-hole grapple

1988-07-05

1990-04-24

Wasil, Daniel

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

376262, 376268, 294 8625, G21C 1920

Patent

active

049198815

ABSTRACT:
A remotely operated device which attaches to an existing internals lifting rig to safely lift and transport nuclear reactor internals structures. The device includes a grapple assembly uniquely formed to maximize the effective bearing surface of an annular shoulder disposed on the grapple assembly to engage the internal structure. The annular shoulder comprises a first outer diameter, the annular shoulder defining a second outer diameter disposed thereabove. The grapple assembly comprises a plurality of fingers circumferentially disposed about an actuator rod which has a diameter essentially equal to a first inner diameter of the grapple assembly. The lower end of the grapple assembly has a second inner diameter smaller than the first and axially adjacent to the annular shoulder. In order to maximize the bearing surface, the fingers of the grapple assembly are formed such that the first inner and outer diameters are machined with respect to a first axis, whereas the second inner and outer diameters are formed with respect to a second axis parallel to the first. These machining axes are offset from each other by a distance which is equal to the desired amount of radial expansion of the fingers. This uniquely formed grapple device thus has a bearing surface 30 to 40 percent greater than that achieved by prior art devices.

REFERENCES:
patent: 3638988 (1972-02-01), Brown
patent: 4093294 (1978-06-01), Taylor
patent: 4236966 (1980-12-01), Savin et al.
patent: 4236967 (1980-12-01), Batjukov et al.
patent: 4244616 (1981-01-01), Buchalet
patent: 4643868 (1987-02-01), Bollinger
patent: 4663114 (1987-05-01), Cransac et al.
patent: 4747997 (1988-05-01), Boatwright

Affiliated with

Also associated with

Rating

Reactor internals through-hole grapple does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reactor internals through-hole grapple, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reactor internals through-hole grapple will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-33293