System for installing a steam generator nozzle dam

Details System for installing a steam generator nozzle dam System for installing a steam generator nozzle dam

1990-10-18

1991-07-16

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

376204, G21C 1900

Patent

active

050323504

ABSTRACT:
A system and method for installing a nozzle dam unit (26) in a nuclear steam generator having a head (12) including a head internal surface, a manway (14) penetrating the head, and a nozzle (16) penetrating the head. The system comprises a manipulator (76) adapted to be passed through the manway and having open end (82) adapted to be attached remotely to the head internal surface and a free end including a clamp member (104). A plurality of nozzle dam segments (54, 56, 58) are each sized to pass through the manway and carry means thereon (120) for engaging at least one other segment, the segments when fully engaged to each other forming a dam subassembly sized to pass into and seat against the nozzle. The manipulator is controlled so that the clamp member grasps and supports one of the dam segments within the head until the subassembly is formed within the head, and then is translated within the head until the dam subassembly seats within the nozzle.

REFERENCES:
patent: 4265011 (1981-05-01), Lebouc
patent: 4482076 (1984-11-01), Wentzell
patent: 4667701 (1987-05-01), Evans et al.
patent: 4684491 (1987-08-01), Rylatt
patent: 4777008 (1988-10-01), Shirasu
patent: 4782863 (1988-11-01), Lavalerie et al.
patent: 4860919 (1989-08-01), Weisel et al.
patent: 4959192 (1990-09-01), Trundle et al.

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