Document: NUREG-0800
Document ID: f994604a-3360-4514-afe7-68461d4dfd34
Document Type: srp
Title: FLOODING PROTECTION REQUIREMENTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070256.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.10
CFR Part: 
CFR Title: 

Content:
l data have been accumulated; b. Appropriate combinations of the effects of normal and accident conditions with those of the natural phenomena; and DRAFT Rev. 3 - April 1996 2.4.10-4 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 must be addressed by this section. In general terms, it also specifies the level of conservatism that must be used to assess the severity of these phenomena for the purpose of determining the design bases (or protection) requirements for structures, systems, and components important to safety. Meeting the requirements of GDC 2 provides assurance that structures, systems, and components important to safety have been designed (or are protected) so as to withstand the most severe flooding likely to occur.24 3. Compliance with 10 CFR 100.10(c) requires that the site's physical characteristics (including seismology, meteorology, geology, and hydrology) be taken into account when determining its