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Analysis of Embedded and Surface Flaws in the Beltline of an RPV Subjected to Cyclic Loading Associated With Normal Operational Cool-Down and Heat-Up Transients: A Scoping Study

[+] Author Affiliations
Shengjun Yin, Terry L. Dickson, Paul T. Williams, B. Richard Bass

Oak Ridge National Laboratory, Oak Ridge, TN

Paper No. PVP2008-61387, pp. 91-101; 11 pages
doi:10.1115/PVP2008-61387
From:
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication, Parts A and B
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4829-6
  • Copyright © 2008 by ASME

abstract

The influence of thermal-hydraulic cyclic loading on postulated embedded and surface-breaking flaws in the beltline region of a reactor pressure vessel (RPV) are investigated numerically. Over the service life of a nuclear power plant, the RPV is expected to undergo a sequence of cool-down and heat-up thermal-hydraulic transients associated with, for example, scheduled refueling outages (RFOs) or other normal operational transients. With respect to postulated surface or embedded flaws in the RPV wall, these scheduled operational transients produce cyclic, variable-amplitude, nonlinear, multiaxial applied loadings, albeit with possibly long dwell times between the active portions of the cycles. The on-going scoping study indicates that for very large flaws, the driving force increases rapidly with cyclic hardening but tends to saturate after several loading cycles as a stabilized condition is approached; while the driving force tends to keep constant under the cyclic loading for those smaller flaws frequently used in the Pressurized Thermal Shock (PTS) study.

Copyright © 2008 by ASME
Topics: Heat

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