Document: NUREG-0800
Document ID: 64c331f4-7cf6-4155-b7d2-b0087a4254b8
Document Type: srp
Title: PROBABLE MAXIMUM TSUNAMI FLOODING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070246.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.6
CFR Part: 
CFR Title: 

Content:
ly site permit reviews, the findings will consist of a statement summarizing 20 estimates of the maximum and minimum tsunami water levels, and static and dynamic effects of wave action. A statement of acceptability of the tsunami induced design basis in meeting the requirements of GDC 2; 10 CFR Part 100; and 10 CFR Part 100, Appendix A, will be made. If the tsunami conditions do not constitute a design basis, the findings will so indicate. For operating license (OL) reviews or reviews of plants proposed for a site with an early site permit , the findings will consist of the evaluation of any new information on tsunami potential, 21 improvements in predictive models, acceptability of specific design bases, and the acceptability of design provisions. A sample statement for a CP review follows: The staff concludes that the plant design is acceptable with respect to its ability to withstand the effects of tsunami. It therefore meets the tsunami design requirements of GDC 2; 10 CFR Part 100; and 10 CFR Part 100, Appendix A. This conclusion is based on the following analysis. 2.4.6-7 DRAFT Rev. 3 - April 1996 Analyses of tsunamic effects from local and distant generators were performed by the applicant at the staff's direction. The design tsunami results from a magnitude 8.7 earthquake in the Aleutian Trench. A finite difference numerical model was used to analyze tsunami generation and propagation to the continental shelf. Results of this computation were used in a near-shore model to calculate tsunami runup and drawdown. Including the effects of high and low tides of annual occurrence, the maximum tsunami runup and drawdown are estimated as +24.5 feet +7.5-m (+24-ft) MLLW and 13.4 22 feet -4.1-m (-13.4-ft) MLLW, respectively. Wind waves of annual severity were 23 assumed coincident with the tsunami. Plant grade at elevation +55 feet +16.8-m (+55-ft) MLLW is well above the tsunami flood level. The maximum wave runup, at 24 the intake pumphouse, was estimated as +31.2