Nut runner for removing and installing reactor pressure vessel h

Details Nut runner for removing and installing reactor pressure vessel h Nut runner for removing and installing reactor pressure vessel h

1995-05-24

1997-12-02

Meislin, D. S.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 55, 81 5724, B25B 2100

Patent

active

056924186

ABSTRACT:
A nut runner tool is used to engage, turn, capture and lift the RPV head closure nuts from the RPV studs. The tool is also used to capture, lift and transport the nuts from the storage tray to the RPV head closure studs. The nut runner system enables a single operator to remove and install head closure nuts quickly and safely. The nut runner is powered by a remotely operated air driver. The reaction torque is transferred safely through the tool into the top of the closure stud. The air driver unthreads the nut, then a nut holding device is actuated, and the nut and tool are lifted from the top of the stud with a hoist attached to a trolley. The nut and tool are moved radially from the stud location to the storage position in the nut rack. When positioned over the storage location, the lowering of the nut into the rack is performed by the hoist, eliminating the need to manhandle the nuts into and out of the storage rack. After lowering the nut into the nut rack, the nut holding device is released and the nut runner is moved to the next location. The reverse of this process reinstalls the nuts.

REFERENCES:
patent: 1970179 (1934-08-01), Miller
patent: 2390620 (1945-12-01), Shapiro
patent: 4295393 (1981-10-01), Adcock
patent: 5178045 (1993-01-01), Frizot

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