Steam generator shell parting method and apparatus

Details Steam generator shell parting method and apparatus Steam generator shell parting method and apparatus

G - Physics

21

C

26/18, 29/4

G21C 13/00 (2006.01)

Patent

CA 1126001

47,762 STEAM GENERATOR SHELL PARTING METHOD AND APPARATUS A method and apparatus for effecting within a nuclear power plant horizontal separation of the vertically- extending cylindrical wall of the shell of a steam generator by an accurate cutting technique that generates a weld accommodating profile in preparation for subsequent rejoin- ing. This is attained by progressive installation of hori- zontal hinged-section tension band assemblies around the shell, adding vertical anchor members clamped to the bands at circumferential intervals therearound, hanging and lock- ing track support brackets onto the anchor members, assembly of a multiple-section rigidized circular track onto the support brackets and around the shell, vertically and radi- ally adjusting and locking the track in place, roller mounting a carriage-supported milling machine assembly on the track, and taking a series of tapered milling cut in the shell wall while the milling machine assembly is moved along the track by use of gear teeth thereon.

338796

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