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SCC in Shroud Support Cylinder Vertical Weld Lines (Tokai-2)

[+] Author Affiliations
Yuichi Arita

Japan Atomic Power Company, Tokai-mura, Ibaraki, Japan

Koji Dozaki

Japan Atomic Power Company, Tokyo, Japan

Fumio Manabe

Babcock-Hitachi K.K., Kure-shi, Hiroshima, Japan

Satoshi Kanno

Hitachi, Ltd., Hitachi-shi, Ibaraki, Japan

Paper No. ICONE14-89345, pp. 119-122; 4 pages
doi:10.1115/ICONE14-89345
From:
  • 14th International Conference on Nuclear Engineering
  • Volume 3: Structural Integrity; Nuclear Engineering Advances; Next Generation Systems; Near Term Deployment and Promotion of Nuclear Energy
  • Miami, Florida, USA, July 17–20, 2006
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-4244-4 | eISBN: 0-7918-3783-1
  • Copyright © 2006 by ASME

abstract

SCC was found outer surface of shroud support cylinder vertical weld lines (V8) made of Nickel based alloy, alloy 182, for Tokai-2 (BWR-5) operated since 1978. Three SCC among 4 weld lines of V8 were observed. The material of Alloy182 was known to have SCC potential in BWR environment. Based on the result of finite element method analysis, it was estimated that tensile circumferential stress generated at the upper corner of cylinder corresponding crack location when H7 welded. The integrity assessment against seismic load in design was performed using shell model in finite element method analysis. It assumed conservatively that four vertical through wall cracks along whole length of V8 weld lines and four horizontal through wall partial cracks along H7 weld line at intersections of V8 and H7. The collapse load was estimated by twice slope method, a kind of limit load analysis. As the result of the integrity assessment, a critical horizontal through wall crack length along H7 weld line was about 1400 mm per one crack (about 70% of all circumferences). SCC growth was evaluated to reach the critical length after about 20 years, where maximum crack growth rate, 63mm/year was assumed. It is not judged that the immediate repair of vertical SCC is necessary.

Copyright © 2006 by ASME
Topics: Cylinders

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