On September 2007, Primary Water Stress Corrosion Cracking (PWSCC) flaws were found on the dissimilar metal weld of the steam generator (SG) inlet pipe nozzles of Tsuruga-2. Following the Tsuruga-2, similar cases were found in some other plants. These cracks were located in inaccessible regions by Ultrasonic Testing (UT) examination applied from the outer surface. Triggered by these cases, the Nuclear and Industrial Safety Agency (NISA), Japanese regulator of nuclear industries, directed nuclear power plant owners to investigate current status of these inaccessible regions for inspection defined by rules on fitness-for-service in Japan, and required to show developing plan on alternative measures of inspection for UT-exempted welds. On the other hand, the study to manage inaccessible regions in the rules on fitness-for-service has been started. The authors consider and propose a possible approach for modified rules of inspection in order to make control of these inaccessible regions.
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17th International Conference on Nuclear Engineering
July 12–16, 2009
Brussels, Belgium
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-4354-3
PROCEEDINGS PAPER
An Approach to Controlling Inaccessible Regions for Inspection Defined by Rules on Fitness-For-Service in Japan Available to Purchase
Takashi Ota,
Takashi Ota
The Japan Atomic Power Company, Tokyo, Japan
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Koji Dozaki
Koji Dozaki
The Japan Atomic Power Company, Tokyo, Japan
Search for other works by this author on:
Takashi Ota
The Japan Atomic Power Company, Tokyo, Japan
Koji Dozaki
The Japan Atomic Power Company, Tokyo, Japan
Paper No:
ICONE17-75585, pp. 155-158; 4 pages
Published Online:
February 25, 2010
Citation
Ota, T, & Dozaki, K. "An Approach to Controlling Inaccessible Regions for Inspection Defined by Rules on Fitness-For-Service in Japan." Proceedings of the 17th International Conference on Nuclear Engineering. Volume 4: Codes, Standards, Licensing and Regulatory Issues; Student Paper Competition. Brussels, Belgium. July 12–16, 2009. pp. 155-158. ASME. https://doi.org/10.1115/ICONE17-75585
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