Full Content is available to subscribers

Subscribe/Learn More  >

Fire PRA Insights

[+] Author Affiliations
James R. Chapman

Scientech, Curtiss Wright Flow Control, Lake Mary, FL

Paper No. ICONE21-16832, pp. V003T06A049; 9 pages
  • 2013 21st International Conference on Nuclear Engineering
  • Volume 3: Nuclear Safety and Security; Codes, Standards, Licensing and Regulatory Issues; Computational Fluid Dynamics and Coupled Codes
  • Chengdu, China, July 29–August 2, 2013
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-5580-5
  • Copyright © 2013 by ASME


Scientech has recently developed Fire PRAs (FPRAs) for about 20% of the units in the US transitioning to an NFPA-805 licensing basis. This paper provides a summary of insights gained in conducting these studies. A summary of the methods, results and insights is provided. These evaluations are identifying cost beneficial enhancements and identifying the need for improvements in methods and data. The identification of plant enhancements should not be surprising, as the mitigation portion of the fire protection design basis provides for a single safe shutdown path. Most design basis events, e.g., loss of coolant accidents (LOCAs) require at least 2 safe shutdown paths. There are credible fire scenarios which can either fail both trains or result in the need for local manual actions to bypass fire induced failures to align a safe shutdown path. In addition, the safe shutdown path may have lower than expected reliability, if several actions are needed, actions have limited time margin, or the resulting safe shutdown path is subject to single failures, such as failure of an emergency diesel generator.

The paper will discuss insights, plant modifications, and defense in depth. Further, key uncertainties which point to the desirability of methods and data enhancement will be discussed. The paper concludes that fire risk is not low and defense in depth can be compromised.

Copyright © 2013 by ASME
Topics: Fire



Interactive Graphics


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

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