Document: NUREG-0800
Document ID: ed40908c-6d5d-42a3-bb9e-fcf4f68dd278
Document Type: srp
Title: FLOODING PROTECTION REQUIREMENTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340554.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.10
CFR Part: 
CFR Title: 

Content:
reviews the specific designs of flood protection measures are reviewed to assure the protection levels are adequate (including static and dynamic effects) for the controlling flood conditions and that any necessary technical specifications are considered. 3. Standard engineering practice in positive flood control and shore protection, such as that developed by the Corps of Engineers, provides the basis for acceptance of methods to be employed for protection. Where sites are "hardened", that is, where emergency action is required, the time available to implement emergency procedures must be estimated by analysis of the hydrologic-design event. The environmental conditions-likely to. prevail during all potential flooding events up to and including events of the severity of the controlling event are compared with the requirements for implementing flood emergency procedures. If the environmental conditions likely are such that the procedures can be carried out, they will be con- sidered acceptable. An appropriate item in the plant Technical Specifica- tions will be required in cases where emergency procedures are required to assure adequate flood protection. 4. "Hardened" flood protection (as discussed in Regulatory Guide 1.59, for facilities identified in Regulatory Guide 1.29) will be interpreted to mean "almost always in place." III. REVIEW PROCEDURES The estimated design basis flood level is compared with the locations and eleva- tions of safety-related components. The staff will independently determine from analyses of postulated individual hydrologic events whether flood protection is required, and if so, what protective levels (including static and dynamic effects) are applicable. These data are transmitted to Structural Engineering Branch (SEB) for determination of structural design criteria adequacy and to Auxiliary Systems Branch (ASB) and Equipment Qualification Branch (EQB) for determination of safety system adequacy. For flood protection requiring emer-