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A Fracture Mechanics Evaluation of BWR Vessel Water Level Instrumentation Nozzle P-T Curve Assessment Including Impact of Irradiation Effects

[+] Author Affiliations
Hardayal S. Mehta, Lori J. Tilly, Donald A. Sampson

GE Hitachi Nuclear Energy, San Jose, CA

Paper No. PVP2012-78734, pp. 799-804; 6 pages
doi:10.1115/PVP2012-78734
From:
  • ASME 2012 Pressure Vessels and Piping Conference
  • Volume 1: Codes and Standards
  • Toronto, Ontario, Canada, July 15–19, 2012
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5500-3
  • Copyright © 2012 by ASME

abstract

This paper describes the evaluation performed to determine the bounding T-RTNDT for the Boiling Water Reactor (BWR) Water Level Instrumentation (WLI) nozzle for use in establishing reactor pressure vessel Pressure-Temperature (P-T) curves. The evaluation used finite element based fracture mechanics to augment the methods described in the ASME Boiler & Pressure Vessel Code, Section XI, Appendix G. A 3-D finite element linear elastic fracture mechanics analysis was conducted to determine the mode I stress intensity factor at the tip of a 1/4 thickness postulated flaw in the nozzle blend radius. Also included is a general discussion on the impact on the P-T curves of the postulated irradiation shift in RTNDT at the WLI nozzle.

Copyright © 2012 by ASME

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