Document: NUREG-0800
Document ID: 48e0424f-1ce1-40c2-8315-90d07a9f20d5
Document Type: srp
Title: FLOODING PROTECTION REQUIREMENTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730437.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.10
CFR Part: 
CFR Title: 

Content:
following paragraphs: 1. Compliance with GDC 2 requires that nuclear power plant structures, systems, and components important to safety 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 criterion further specifies that the design bases for these structures, systems, and components shall reflect the following: A. Appropriate consideration of the most severe natural phenomena historically reported for the site and its surrounding area, with sufficient margin for the limited accuracy, quantity, and time period in which the historical data have been accumulated; 2.4.10-5 Revision 3 - March 2007 B. Appropriate combinations of the effects of normal and accident conditions with those of the natural phenomena; and C. The importance of the safety functions to be performed. The first specification was adopted in recognition of the relatively short history available for severe natural phenomena (e.g., flooding) on the North American continent and, consequently, the potential for underestimating the severity of a natural phenomenon based solely on probabilistic considerations. This problem is avoided by the use of a deterministic approach that considers the practical physical limitations of those phenomena contributing to the severity of the event in order to assess the design basis event. These data are then used during reviews conducted for a CP, OL, COL, or early site permit to specify flood design or protection requirements for nuclear power plant components, thereby ensuring the capability of these components to continue functioning as required. GDC 2 is imposed to ensure that portions of the facility designated as important to safety will continue functioning to maintain the plant in a safe condition. This criterion is applicable to SRP Section 2.4.10 because it specifies the hydrologic phenomena that are addressed by this section.