Water Jet Peening Apparatus and Water Jet Peening Method
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United States of America Patent
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Issued Date -
Jan 15, 2015
app pub date -
Jul 10, 2014
filing date -
Jul 12, 2013
priority date (Note) -
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Abstract
A water jet peening apparatus (WJP apparatus) includes a seating member, rotating portion set to it, and first and second injection nozzles. A hoisting apparatus is attached to the rotating portion, and the first and second injection nozzles are attached to a nozzle arm. The WJP apparatus is gone down in a reactor vessel (RV) by crane operation, and the seating member is seated on a bottom mounted instrumentation nozzle welded to a bottom head of the RV. By the hoisting apparatus, the nozzle arm is gone down and the first and second injection nozzles are gone down. The first injection nozzle is inserted into the bottom mounted instrumentation nozzle and the second injection nozzle is set outside the bottom mounted instrumentation nozzle. High-pressure water is jetted from the first and second injection nozzles, and WJP is implemented for both of the inner and outer surfaces of the welding area of the bottom mounted instrumentation nozzle.
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