0

Full Content is available to subscribers

Subscribe/Learn More  >

Structural Evaluation of Degraded Containment Penetration Sleeves

[+] Author Affiliations
Daniel J. Vasquez, Amy J. Smith, Keshab K. Dwivedy

Dominion Resources Services, Inc., Glen Allen, VA

Paper No. PVP2008-61514, pp. 307-312; 6 pages
doi:10.1115/PVP2008-61514
From:
  • 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

abstract

The design of a nuclear plant includes “hot” containment penetration assemblies designed to protect the containment building concrete walls from the effects of localized high temperature and degradation due to thermal cycling resulting from the process piping. Typically, a penetration assembly is jacketed by coolers inside and outside a sleeve originating at a flued head on the process pipe and penetrating the containment wall. The coolers are supplied by either chromated component cooling (CC) or raw service water. Recently, a minor leak of chromated water from the penetration coolers rendered the Class 3 safety-related CC system inoperable and was isolated. Subsequently, Non-Destructive Examination (NDE) inspections of the sleeve were conducted and significant degradation was noted. The root cause of the degradation under the jacketed cooler was due to raw service water, which was used in the cooler prior to switching to CC water. Weld repairs were subsequently performed to restore degraded areas. The coolers were also removed since the air gap could provide adequate insulation to keep the sleeve below a threshold temperature for degradation of concrete. An evaluation of past functionality was still required, however, to demonstrate that the degradation did not affect the structural integrity of the sleeve and breach containment boundary. The NDE data was processed to characterize the degradation for analysis. A novel application of ASME Section XI Non-mandatory Appendix C with a simple extension of the methodology was used in the evaluation to assist the operability determination. The paper concludes that a simple extension of the code methodology was useful in establishing plant operability.

Copyright © 2008 by ASME
Topics: Containment

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In