Document: NUREG-0800
Document ID: f689fb6d-4711-4972-b900-1b2001877b19
Document Type: srp
Title: TSUNAMI HAZARDS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1819/ML18190A200.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.6
CFR Part: 
CFR Title: 

Content:
orresponding to different locations within the powerblock, as the flood water elevation may vary spatially owing to differences in the finished site grade and the presence of multiple as-built reactor structures. If the maximum estimated inundation elevation exceeds the plant grade, the staff needs to review the detailed flooding levels corresponding to different locations near the SSCs important to safety. That review would include confirming that complete hydrographs were submitted by the applicant to determine the flood event duration parameters and to prepare flood protection and mitigation measures. As mentioned above, the staff should review this information, which should be contained in one or more inundation maps prepared by the applicant. The staff review should also include the estimation of flood-related. The staff reviews how the applicant’s estimation of flood hazards have accounted for the location and orientation of various structures within the powerblock with particular attention to those SSCs important to safety as well as variations in the site grade. Inundation caused by the tsunami wave may also necessitate additional flood protection measures for certain SSCs important to safety in the form of operational procedures, including manual staff actions. This information should also be reviewed by the staff. The staff reviews the effect of the drawdown caused by that tsunami wave and how it may affect a safety-related intake structure (a type of SSC generally considered important to safety), if they are used in the plant design and are exposed to the effects of the tsunami wave. The staff also reviews the duration of the drawdown caused by the tsunami wave to estimate the time during which a safety-related intake structure may be affected. The staff should note that the suggested criteria of RG 1.27 apply when the water supply comprises part of the ultimate heat sink. The staff should confirm that the application demonstrates that the extent and