The Japan Electric Association Code, JEAC 4201, “Method of Surveillance Tests for Structural Materials of Nuclear Reactors” was revised in 2007. Major revised points of JEAC4201-2007 are: 1) A new irradiation embrittlement correlation method, 2) Reconstitution of surveillance specimen, 3) Long-term surveillance program. An overview of the revised JEAC 4201-2007 is presented in this paper.

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