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Vol.9 No.3previous AASP18(143-144-145-146-147) NT86-87

Academic Articles
Regular Paper Vol.9 No.3 (2017) p.168 - p.172

Toward Effective Nuclear Power Plant Ageing Management
- On the Second Revision of the AESJ Code -

Masahide Suzuki1, Nobuyuki Nakagawa2, Shingo Ito2, Takayuki Matsufuji3, Masao Uesaka4, Takashi Hojo5, Ichiro Tamura6, Naoto Sekimura7

1 Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka, Niigata 940-2188,
2Nuclear Engineering, Ltd,
3Tokyo Electric Power Services Co., Ltd,
4Tokyo Electric Power Company Holdings, Inc.,
5The Kansai Electric Power Co., Inc.,
6The Chugoku Electric Power Co., Inc.,
7The University of Tokyo


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.

Ageing Management, Ageing Phenomena, Ageing Mechanisms, Nuclear Power Plant, Seismic Effects
Full Paper: PDF
Article Information
Article history:
Received 12 October 2016
Accepted 29 May 2017