Method and apparatus for a riser pipe repair with compression

摘要

A method and apparatus for repairing and/or reinforcing a Boiling Water Reactor (BWR) jet pump riser pipe. The repair includes attaching two collars to the riser pipe using match drilling to drill holes through the collars and the riser pipe and plugging the holes with expandable plugs. Support columns are attached to the collars. Brace supports are slideably attached to the support columns. Gaps between each brace support and its respective collar are then narrowed as ratchet bolts may apply a force that pulls downward on an upper collar and pulls upward on a lower collar, thereby exerting a compression force on the riser pipe. A clamp assembly may also be located between the two collars that applies a hoop force on the riser pipe.

主权项

1. A riser pipe repair, comprising:
a first collar configured to attach to a straight portion of a riser pipe of a boiling water reactor (BWR) jet pump assembly; one or more upper support columns attached to the first collar; a second collar configured to attach to the straight portion of the riser pipe; one or more lower support columns attached to the second collar; brace supports slideably attached to the upper and lower support columns, the support columns and brace supports each having a longitudinal length that is configured to exist in a plane that is substantially parallel to a longitudinal length of the straight portion of the riser pipe; and ratchet bolts connecting the brace supports to the upper and lower support columns, the brace supports, and the upper and lower support columns configured to axially compress the straight portion of the riser pipe by applying an axial compression force in a direction running along the longitudinal length of the straight portion of the riser pipe as the ratchet bolts are tightened.