Abstract
Some of Japan's ageing operating nuclear power generators are entering their 30th year, which is close to their designed lifespan. With this in mind, JSME (Japan Society of Mechanical Engineer) issued Rules on fitness-for-service for nuclear power plants in May 2000, in which operating plants' maintenance rules were defined and the urgent need for in-situ repair methods on nuclear power plant flaws stated. Because low heat input repairs are necessary for the aged materials of the plants, the authors developed a new method of friction surfacing repairs to be processed under the melting point of the substrate after the surface grooving of SCC, and demonstrated its applicability in-situ.
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