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KI Evaluation Method on Crack Growth of Bottom Mounted Instrumentation Penetrations in a Reactor Pressure Vessel

[+] Author Affiliations
Masayuki Mukai

Mitsubishi Heavy Industries, Ltd., Hyogo-ku, Kobe, Japan

Tetsuo Yamashita

Mitsubishi Heavy Industries, Ltd., Takasago, Hyogo, Japan

Naoki Chigusa, Masashi Kameyama

Kansai Electric Power Company, Inc., Osaka, Japan

Seiji Asada

Mitsubishi Heavy Industries, Ltd., Kobe, Japan

Paper No. PVP2004-2990, pp. 177-186; 10 pages
  • ASME/JSME 2004 Pressure Vessels and Piping Conference
  • Elevated Temperature Design and Analysis, Nonlinear Analysis, and Plastic Components
  • San Diego, California, USA, July 25–29, 2004
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4667-9
  • Copyright © 2004 by ASME


A method to evaluate a Mode I stress intensity factor KI for bottom mounted instrumentation (BMI) penetrations (nozzles) in a reactor pressure vessel (RPV) has been developed in order to perform the crack growth analysis simply and accurately. As regards the KI evaluation method, the several studies has been reported for a simple pipe with inside surface crack [1][2][3]. However, the study on the structure like the BMI nozzle joined with the vessel head by J-welding, has never been reported. Therefore, KI for BMI nozzles should be evaluated considering the load and the displacement by this interaction. The KI is evaluated simply by multiplying three correction factors to the one for a two-dimensional crack in a flat plate. These factors are to correct the flat plate’s KI to pipe’s one, two-dimensional crack shape to three-dimensional one, and to consider bottom head influence by the interaction. As regards a stress distribution in the wall thickness to be used, it is divided into the load control type and the displacement control one because the excessive conservativeness is excluded. Finally, the KI is calculated by superposing the one evaluated for each stress type. The evaluated KI was verified by comparing with the detailed three-dimensional FEA results. A simplified and accurate KI evaluation method for BMI nozzles in a RPV is proposed in this paper.

Copyright © 2004 by ASME



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