[en] In order to ensure safe and stable Nuclear Power Plant (NPP) operation, effective ageing management (AM) program and implementation of the program is necessary. For this purpose, the 'Code on Implementation and Review of Nuclear Power Plant Ageing Management Programs', which was prepared by the Atomic Energy Society of Japan (AESJ), is used in Japan. The Code has been endorsed and used in the regulation by Japanese regulatory body. Since the first edition was issued in 2007, continuous effort for improvement was made, and the second revision was issued quite recently in 2015. The Code has the following features; Specify ageing management actions according to plant operational years from the early stage of plant operation. Utilize 'Summary Sheet of Ageing Phenomena', which has been made based on the results of aging management technical evaluation and the actual operation experience of Nuclear Power Plants (NPPs) in Japan. 8 ageing phenomena which should be selected and subject to AM technical evaluation are listed, and the evaluation procedures including the seismic safety evaluation are enacted in the Attachment as a part of the Code. In the revision, not only new information and data are added reflecting the further operating experience and the latest knowledge including IAEA IGALL, but also the evaluation procedures and 'Summary Sheet of Ageing Phenomena' are enriched in terms of seismic effects. The approach to effective AM program and their implementation are explained and discussed. (author)