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Tsunami Hazard Assessment at Nuclear Power Plant Sites in the United States of America - Final Report (NUREG/CR-6966)On this page: Download complete document The following links on this page are to documents in Adobe Portable Document Format (PDF). See our Plugins, Viewers, and Other Tools page for more information. For successful viewing of PDF documents on our site please be sure to use the latest version of Adobe. Publication InformationManuscript Completed: March 2009 Prepared by Pacific Northwest National Laboratory E. Cunningham, NRC Project Manager NRC Job Code J3301 Office of New Reactors AbstractWe describe the tsunami phenomenon with the focus on its relevance for hazard assessment at nuclear power plant sites. Chapter 1 includes an overview of tsunamis and mechanisms that generate tsunamis. Three tsunamigenic mechanisms—earthquakes, landslides, and volcanoes—are considered relevant for hazard assessment at nuclear power plant sites. We summarize historical tsunami occurrences, including descriptions of source mechanisms and damages caused by these events. Historical landslides and potential landslide areas in earth’s oceans are described. We describe the hierarchical-review approach to tsunami-hazard assessment at nuclear power plant sites in Chapter 2. The hierarchical-review approach consists of a series of stepwise, progressively more-refined analyses to evaluate the hazard resulting from a phenomena at a nuclear power plant site. We recommend that the hierarchicalreview approach employ a screening analysis to determine if a site is subject to tsunami hazard based on the presence of a tsunamigenic source and the location and elevation of the site. The screening analysis is expected to ensure that analysis and review resources are not wasted at sites with little potential of exposure to tsunamis. Chapter 3 describes the effects tsunami waves may have at a nuclear power plant site. These effects result in hazards that may directly affect the safety of a plant’s structures, systems, and components. Structures, systems, and components important to the safety of a plant should be adequately designed and, if required, protected from these hazards. Chapter 4 describes data required for a detailed tsunami-hazard assessment and sources of these data. We recommend using existing resources and previously completed tsunami-hazard assessments, if available and appropriate. Detailed tsunamihazard assessment at a nuclear power plant site should be based on the probable maximum tsunami. Chapter 5 defines the probable maximum tsunami, its determination at a site, and subsequent hazard assessment. We point out that a tsunamigenic source that produces probable maximum tsunami hazards at a site may not be determined a priori. It may be necessary to evaluate several candidate sources and the tsunamis generated from them under the most favorable tsunamigenic source and ambient conditions. The set of hazards obtained from all such scenario tsunamis should be considered to determine design bases of the plant structures, systems, and components. Chapter 6 describes international practices by Japan and the International Atomic Energy Agency, which are reviewed for completeness. The appendix provides a stepwise guide to site-independent analyses for tsunami-hazard assessment. Paperwork Reduction Act Statement This NUREG does not contain information collection requirements and, therefore, is not subject to the requirements of the Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.). Public Protection Notification The NRC may not conduct or sponsor, and a person is not required to respond to, a request for information or an information collection requirement unless the requesting document displays a currently valid OMB control number. |
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