United States Nuclear Regulatory Commission - Protecting People and the Environment

Proceedings of the Workshop on Probabilistic Flood Hazard Assessment (PFHA): Held at the U.S. Nuclear Regulatory Commission Headquarters, Rockville, MD, January 29–31, 2013 (NUREG/CP-0302)

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Publication Information

Manuscript Completed: June 2013
Date Published:
October 2013

Prepared by:
T. J. Nicholson and W. A. Reed

Office of Nuclear Regulatory Research
Division of Risk Analysis
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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Abstract

The U.S. Nuclear Regulatory Commission’s (NRC’s) Offices of Nuclear Regulatory Research (RES), Nuclear Reactor Regulation (NRR) and New Reactors (NRO) organized this Workshop on Probabilistic Flood Hazard Assessment (PFHA). The workshop was held January 29–31, 2013 at the NRC headquarters auditorium, 11545 Rockville Pike, Rockville, MD. The workshop was coordinated with Federal agency partners: the U.S. Department of Energy (DOE), U.S. Department of the Interior’s Bureau of Reclamation (BoR) and U.S. Geological Survey (USGS), U.S. Army Corps of Engineers (USACE), and Federal Energy Regulatory Commission (FERC). The research workshop was devoted to the sharing of information on probabilistic flood-hazard assessments for extreme events (i.e., annual exceedance probabilities much less than 2.0E–3 per year) from the Federal community. The topics included: Federal agencies’ interests and needs in PFHA; State of the Practice in Identifying Extreme Flood Hazards; Extreme Precipitation Events; Flood-Induced Dam and Levee Failures; Tsunami Flooding; Riverine Flooding; Extreme Storm Surges for Coastal Areas; and Combined Events Flooding. The workshop objectives included to: (1) assess, discuss, and inform workshop participants on the state of the practice for extreme flood assessments within a risk context, (2) facilitate the sharing of information between both Federal agencies and other interested parties to bridge the current state of knowledge between extreme flood assessments and risk assessments of critical infrastructures, (3) seek ideas and insights on possible ways to develop a PFHA for use in probabilistic risk assessments, (4) identify potential components of floodcausing mechanisms that lend themselves to probabilistic analysis and warrant collaborative study, and (5) establish realistic plans for coordination of PFHA research studies. Observations and insights provided during session presentations and subsequent panel discussions that followed were documented by the panel reporters and are included in this report.

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