METHOD AND DEVICE FOR PEENING INSIDE OF NUCLEAR REACTOR

• Main Authors: HAYASHI MAKOTO, ENOMOTO KUNIO, HIRANO KATSUHIKO
• Format: Patent
• Language: English
• Published: 24.10.2000
• Edition: 7
• Subjects: DECONTAMINATION ARRANGEMENTS THEREFOR; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; NUCLEAR REACTORS; PHYSICS; PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULARRADIATION OR PARTICLE BOMBARDMENT; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATING RADIOACTIVELY CONTAMINATED MATERIAL

PROBLEM TO BE SOLVED: To provide a method and device for improving residual stresses on a structure in a nuclear reactor without recycling shots in the atmosphere during the execution of replacement construction. SOLUTION: A scaffold 73 is assembled at the bottom of a reactor and the welded parts of the bottom of the reactor are peened therefrom. The portion of an ice projecting gun end 74 is elongated by means of a jig or the like. The main body 76 of a peening device is installed on the side of a worker 75, who holds the ice projecting gun 74 to construct the target part of an in- reactor structure. The dimension from the scaffold to the bottom of the reactor, which varies depending on plants, is generally 1.2 m or so, allowing for operation of the ice projecting gun 74. A drain 77 is installed at the bottom of the reactor to discharge liquid after ices collected at the bottom of the reactor are melted.