Based on the failure probability, the flaw acceptance standard of ASME Code Sec. XI is examined with some concerns weather the failure probability is uniform for flaws with various aspect ratios and failure frequencies are small enough. In this paper, the results of preliminary case studies are described on the failure probability of reactor pressure vessels (RPVs) with a surface flaw specified in Sec. XI. PFM code PASCAL was used for case studies. A PTS (Pressurized Thermal Shock) transient prescribed by NRC/EPRI PTS Benchmark Study was used as an applied load. Analysis results showed that the conditional failure probability of a RPV with an initial flaw of acceptable depth depends on the aspect ratio. In the case flaw shapes are close to semi-circular, the failure probability are higher than that of the cases aspect ration are less than 0.6 by one order of magnitude due to the difference of fracture behavior at the surface point. A case study for determining the acceptable flaws based on failure probability was also carried out.
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ASME/JSME 2004 Pressure Vessels and Piping Conference
July 25–29, 2004
San Diego, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4675-X
PROCEEDINGS PAPER
Study on Flaw Acceptance Standard of ASME Code Sec. XI Based on Failure Probability
Katsuyuki Shibata,
Katsuyuki Shibata
Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken, Japan
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Kunio Onizawa,
Kunio Onizawa
Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken, Japan
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YinSheng Li,
YinSheng Li
Fuji Research Corporation, Tokyo, Japan
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Yasuhiro Kanto,
Yasuhiro Kanto
Toyohashi University of Technology, Toyohashi, Aichi-ken, Japan
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Shinobu Yoshimura
Shinobu Yoshimura
University of Tokyo, Tokyo, Japan
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Katsuyuki Shibata
Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken, Japan
Kunio Onizawa
Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken, Japan
YinSheng Li
Fuji Research Corporation, Tokyo, Japan
Yasuhiro Kanto
Toyohashi University of Technology, Toyohashi, Aichi-ken, Japan
Shinobu Yoshimura
University of Tokyo, Tokyo, Japan
Paper No:
PVP2004-2696, pp. 235-242; 8 pages
Published Online:
August 12, 2008
Citation
Shibata, K, Onizawa, K, Li, Y, Kanto, Y, & Yoshimura, S. "Study on Flaw Acceptance Standard of ASME Code Sec. XI Based on Failure Probability." Proceedings of the ASME/JSME 2004 Pressure Vessels and Piping Conference. Pressure Vessel and Piping Codes and Standards. San Diego, California, USA. July 25–29, 2004. pp. 235-242. ASME. https://doi.org/10.1115/PVP2004-2696
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