| 摘要 |
PROBLEM TO BE SOLVED: To clean a cleaning object in liquid held in an existing structure without disassembling. SOLUTION: Ultrasonic waves 6 are applied to a nuclear reactor vessel 5 to vibrate the reactor vessel to generate cavitation 7 near the surface of the cleaning object for cleaning the inner face of the nuclear reactor vessel 5, being the cleaning object surface in contact with water 22 held in the structure such as the existing nuclear reactor vessel 5. When the cavitation 7 disappears, impact waves reach the inner face of the reactor vessel 5 to remove impurities such as cladding 8 adhering on the inner face of the reactor vessel 5. COPYRIGHT: (C)2008,JPO&INPIT
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