Template method for replacing a vessel in a pipe system

Details Template method for replacing a vessel in a pipe system Template method for replacing a vessel in a pipe system

1989-09-19

1991-02-19

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

376258, 2940208, 122DIG11, G21C 2100

Patent

active

049942301

ABSTRACT:
A method for replacing a vessel in a piping system utilizes a template to determine the relative spatial positions of the pipe connections to the vessel in the existing system. The template is then removed from the existing system and reassembled on the new vessel in a remote location to determine the relative spatial position of the new pipe connections to the new vessel to ascertain if alignment will exist between those new pipe connections and the existing pipes in the system. If not, the pipe connections on the new vessel are initially reworked in the remote location to achieve alignment within connection tolerances. The pipes are then cut at their respective connections to the old vessel, the old vessel is removed, the new vessel is put in place in the system and the cut ends of the pipes are connected to new connections on the new vessel to complete the installation of the new vessel in the piping system. This method, which may be utilized, for example, in replacing a steam generator in the primary system of a nuclear energy plant, allows most of the rework to be performed outside a radioactive environment and minimizes the amount of maintenance downtime for the plant.

REFERENCES:
patent: 4824301 (1989-04-01), Martin
patent: 4847038 (1989-07-01), Martin
patent: 4905630 (1990-03-01), Weber
"Point Beach I Steam Generators Replaced Well Ahead of Schedule", Moers et al., NEI, 1/85, pp. 38-42.
"Replacing the Steam Generators at Surry Unit 2", Parrish, NEI, 5/80, pp. 21-28.

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