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Structural Integrity of Penetration Nozzle of Reactor Pressure Vessel Head of PWR Plant

[+] Author Affiliations
Kiminobu Hojo, Naoki Ogawa, Yoichi Iwamoto, Kazutoshi Ohoto

Mitsubishi Heavy Industries, Ltd., Takasago, Japan

Seiji Asada

Mitsubishi Heavy Industries, Ltd., Kobe, Japan

Hajime Ito, Shinro Hirano

Kansai Electric Power Co., Inc., Mikata-gun, Japan

Paper No. PVP2008-61178, pp. 17-27; 11 pages
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 1: Codes and Standards
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4824-1 | eISBN: 0-7918-3828-5
  • Copyright © 2008 by ASME


A reactor pressure vessel (RPV) head of PWR has penetration holes for the CRDM nozzles, which are connected with the vessel head by J-shaped welds. It is well-known that there is high residual stress field in vicinity of the J-shaped weld and this has potentiality of PWSCC degradation. For assuring stress integrity of welding part of the penetration nozzle of the RPV, it is necessary to evaluate precise residual stress and stress intensity factor based on the stress field. To calculate stress intensity factor K, the most acceptable procedure is numerical analysis, but the penetration nozzle is very complex structure and such a direct procedure takes a lot of time. This paper describes applicability of simplified K calculation method from handbooks by comparing with K values from finite element analysis, especially mentioning crack modeling. According to the verified K values in this paper, fatigue crack extension analysis and brittle fracture evaluation by operation load were performed for initial crack due to PWSCC and finally structural integrity of the penetration nozzle of RPV head was confirmed.

Copyright © 2008 by ASME



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