Tube bundle removal method and apparatus

Details Tube bundle removal method and apparatus Tube bundle removal method and apparatus

1978-05-01

1980-04-29

Mehr, Milton S.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

29726, 176 65, 294266, 29400N, B23P 1904

Patent

active

041998570

ABSTRACT:
Method and apparatus for removing the tube bundle from a steam generator disposed in a nuclear steam power plant while preserving an environment seal between the inside of the generator and the containment vessel. The tube bundle severed from the tubesheet is withdrawn upwardly into a multi-section crane including metal cask placed over an opened upper end of the steam generator shell. Removal of the bundle-containing cask is effectuated by the plant's radius crane and the cask lowered onto a metal cover plate made secure to the bottom of the cask. By a series of manipulations by the cask and radius cranes and use of tube and wrapper cutting equipment, length sections of the tube bundle and its wrapper can be contained in respective sequentially-separated top-and-bottom covered cask length sections for removal from the containment vessel.

REFERENCES:
patent: 3857158 (1974-12-01), Costello
patent: 4125928 (1978-11-01), Cawley et al.

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