Method and apparatus for a riser pipe repair with compression
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United States of America Patent
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Mar 17, 2015
Grant Date -
Jun 21, 2012
app pub date -
Dec 16, 2010
filing date -
Dec 16, 2010
priority date (Note) -
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Abstract
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.
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