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EJAM2-1AA_SP1_"A Review: Japanese Pipe Wall Thinning Management Based on JSME Rules and Recent R&D Studies Performed to Enhance the Rules" written by I. Nishiguchi, et.al."
 
Vol.1 No.4 previous GA 11 - 12 - AA SP1 (11 - 12 - 13 - 14) - NT 19 - 20 - 21 - 22 next Vol.2 No.2
Academic Articles
Invited Review Vol.2 (2010) p.14 - p.24
Special Issue 1: "The Technology of Pipe-wall-thinning Management"
 

A Review: Japanese Pipe Wall Thinning Management Based on JSME Rules and Recent R&D Studies Performed to Enhance the Rules

 
Isoharu NISHIGUCHI1,*, Fumio INADA2, Makoto TAKAHASHI3, Bunji OGAWA4, Tetsuhiko INAGAKI5, Taku OHIRA6, Kotaro IWAHARA7, and Katsuhiko YAMAKAMI8
 
1 Kanagawa Institute of Technology. 1030, Shimo-ogino, Atsugi, Kanagawa 243-0292, Japan
2 Central Research Institute of Electric Power Industry (CRIEPI), 2-11-1, Iwado-kita, Komae-shi, Tokyo 201-8511, Japan
3 Tokyo Electric Power Co., 1-1-3, Uchisaiwai-cho, Chiyoda-ku, Tokyo 100-0011, Japan
4 Kansai Electric Power Co., 8 Yokota, 13 Go-shi, Mihama-cho, Mikata-gun, Fukui 919-1141, Japan
5 Chubu Electric Power Co., 1, Higashi-shinmachi, Higashi-ku, Nagoya 461-8680, Japan
6 Japan Atomic Power Co., 1-1, Kanda Mitoshiro-cho, Chiyoda-ku, Tokyo 100-0053, Japan
7 Hitachi-GE Nuclear Energy Co. 3-1-1, Hitachi-shi, Ibaraki, 317-0073, Japan
8 Mitsubishi Heavy Industries Ltd., 2-1-1, Nihama, Arai-cho, Takasago-shi, Hyogo 652-8585, Japan
 
Abstract
In summer 2004, a large-bore carbon steel pipe of a PWR secondary system ruptured at the Mihama Unit 3, Japan, with some fatalities. The Main Committee on Power Generation Facility Codes (MC-PGFC) of the Japan Society of Mechanical Engineers (JSME) established technical rules for PWRs and BWRs, which were requested by the nuclear power industry as well as the regulatory bodies. In Japan, different wall-thinning management rules have been established for PWR plants and BWR plants because of the difference in their management, such as water chemistry and inspection points. For example, in BWR plants, the wall-thinning rate is relatively small at the condensation system and the feed water system after oxygen injection point. The rules for each type of plant are based on data obtained by wall-thinning measurement. The endorsement of these rules by Nuclear and Industry Safety Agency (NISA) was completed in summer 2008. A special feature of the management of pipe wall thinning in Japan is that Japanese utilities have a large amount of field data for wall thinning. Regarding BWR plants, there are data for 26,000 locations obtained from above two inspections of 29 plants, and for PWR plants, there are data for 20,000 locations obtained from above three inspections of 23 plants.

Moreover, MC-PGFC have produced a roadmap for R&D studies to support and enhance the rules, and many subjects of R&D studies are contained in the roadmap on methods of predicting pipe wall thinning, phenomenological screening procedures for parts whose management is necessary, new methods of measuring pipe wall thickness, improved methods for evaluating the wall-thinning rate, and repair methods. In this paper, the wall-thinning management rules, summary of the roadmap, and trends in recent R&D studies in Japan are outlined.
 
Keywords
Pipe Wall Thinning, Flow Accelerated Corrosion, Liquid Droplet Impingement Erosion, Structural Integrity, Piping System, Codes and Standards, Nuclear Power Plant
 
Full Text: PDF
 
(Received: April 1st, 2010)