Induced nuclear reactions: processes – systems – and elements – Handling of fission reactor component structure within...
Patent
1996-03-22
1997-11-18
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
Handling of fission reactor component structure within...
29252, 29723, 81 5738, C21C 1900
Patent
active
056895372
ABSTRACT:
An apparatus for tensioning a hold down beam of a nuclear reactor jet pump inlet mixer is configured to be inserted in a confined annulus between a core shroud and a reactor vessel of a nuclear reactor. The hold down beam includes a beam body, a pair of opposed beam tabs and a pair of opposed beam trunnions extending outwardly from the beam body, and a threaded beam bolt received within a threaded channel extending through the beam body. The tensioning apparatus includes a housing having a lower base plate and an upper support plate positionable over the body of the hold down beam, rotatable trunnion engaging members for engaging the beam trunnions, reciprocating members coupled to the upper support plate and lower base plate for engaging the inlet mixer adjacent to the beam trunnions, and an actuator mounted between the upper support plate and lower base plate and extending through the lower base plate for selectively actuating the trunnion engaging members. Tensioning of the hold down beam is accomplished by positioning the hold down beam on an upper surface of the inlet mixer with each beam tab under an inlet riser bracket of the jet pump. The tensioning apparatus is then placed over the hold down beam, followed by rotating the trunnion engaging members into engagement with the trunnions, extending the reciprocating members to engage the inlet mixer and to force the beam tabs against the inlet riser brackets to thereby extend an opening between the hold down beam and the upper surface of the inlet mixer, rotating the beam bolt to extend the bolt into contact with the upper surface of the inlet mixer, and removing the tensioning apparatus from engagement with the tensioned hold down beam.
REFERENCES:
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patent: 4675149 (1987-06-01), Perry et al.
patent: 4995158 (1991-02-01), Howell et al.
patent: 5070589 (1991-12-01), Howell et al.
Wasil Daniel D.
Westinghouse Electric Corporation
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