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:
ite and site regions. The staff should confirm that the assessment sufficiently demonstrates that the applicant’s design bases appropriately account for these effects. 2.4.6-9 Revision 4 - September 2018 Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. Compliance with GDC 2 requires that nuclear power plant SSCs important to safety must be designed to withstand the effects of natural phenomena such as earthquake, tornado, hurricane, flood, tsunami, and seiche without loss of capability to perform their safety functions. The GDC further specifies that the design bases for those so designated SSCs shall reflect the following criteria: A. Appropriate consideration of the most severe natural phenomena that have been historically-reported or instrumentally-recorded for the site and surrounding area, with sufficient margin for the limited accuracy, quantity, and time period in which the data have been accumulated; B. Appropriate combinations of the effects of normal and accident conditions with the effects of the natural phenomena; and C. The importance of the safety functions to be performed. The first criterion was adopted in recognition of the relatively short historical/ instrumental record available for the reporting of severe natural phenomena (such as tsunamis) in North American and when, based on probabilistic considerations only, the potential for underestimating the severity of such events given that limited record. The reviewer should note that this information challenge (e.g., epistemic uncertainty) can be avoided by relying on a deterministic approach to evaluating the consequences of certain design basis events, such as tsunamis, taking into account records of past events. Such an approach will account for the practical physical limitations of natural phenomena at a proposed site that contribute to the potential severity