Document: NUREG-0800
Document ID: 3a64837e-1633-463f-a4a7-e8657d177b48
Document Type: srp
Title: PROBABLE MAXIMUM TSUNAMI HAZARDS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0701/ML070160659.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.6
CFR Part: 
CFR Title: 

Content:
GS, and the U.S. Army Corps of Engineers are sufficient. 4. Wave Runup, Inundation, and Drawdown. The staff reviews the wave runup caused by the PMT. An appropriate initial water surface elevation for the body of water under consideration, before the arrival of the tsunami waves, should be assumed, similar to that recommended for storm surges and seiches by ANSI/ANS-2.8-1992. For example, to estimate the highest tsunami wave runup at a coastal site, the 90th percentile of high tides may be used as the initial water surface elevation near the site; to estimate the lowest drawdown caused by receding tsunami waves at the same site, the 10th percentile of the low tides may be used as the initial water surface elevation. The staff reviews the extent of the inundation caused by the tsunami waves at the proposed plant site. The inundation may lead to flooding and should be considered in flooding design bases for the plant SSC. The flooding due to the inundation caused by the tsunami waves may also necessitate flooding protection for some safety-related SSC. The staff also reviews the duration of the inundation caused by the tsunami waves to estimate the time during which the plant safety-related SSC may be affected. The staff reviews the effect of the drawdown caused by the tsunami waves and how it may affect the safety-related intakes, if they are used in the plant design and are exposed to the effects of the tsunami. The staff also reviews the duration of the drawdown caused by the tsunami waves to estimate the time during which a safety- related intake may be affected. The suggested criteria of Regulatory Guide 1.27 apply when the water supply comprises part of the ultimate heat sink. It should be demonstrated that the extent and the duration of the inundation and the drawdown caused by the tsunami waves are adequately established for the purposes of the plant design bases. 5. Hydrostatic and Hydrodynamic Forces. The staff reviews the hydrostatic and the hydrodynamic