Preventive Maintenance Apparatus and Preventive Maintenance Method for Inner Surface of Piping
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United States of America Patent
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Issued Date -
May 23, 2013
app pub date -
Nov 15, 2012
filing date -
Nov 18, 2011
priority date (Note) -
Abandoned
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Abstract
A preventive maintenance apparatus has a movable body and a water jet peening apparatus (WJP apparatus). The movable body installs a jet nozzle for driving and floating bodies on a base body. The movable body suspended in cooling water in a reactor pressure vessel jets high-pressure water from a high-pressure pump from the jet nozzle, advances in the cooling water, and is inserted into a pipe with the cooling water filled which is connected to the reactor pressure vessel. The posture of the movable body in the pipe is controlled by buoyancy adjustment of the floating bodies and the movable body can easily pass through a curve pipe portion. The high-pressure water from a high-pressure pump is jetted from jet nozzles of the WJP apparatus and for the inner surface of a vertical pipe portion, the WJP is executed.
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