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:
es that may endanger the safety function of the SSC exposed to floods should be included. The staff considers all flooding mechanisms and their individual characteristics and interactions with the SSC important to safety to assess the design bases that are proposed for flooding protection. Intake structures, due to their nature, are always flooded, that is, they are located below the water surface. A safety-related intake structure, if one is used, should be provided with flooding protection. The staff will review location and elevation of the safety-related intake to determine the degree of desired flooding protection. Hydrostatic and hydrodynamic forces, impact forces from dynamic effects of floods, erosion and sediment deposition during floods, and any other effects that may lead to loss of functionality of the intake should be considered. “Hardened” protection, as described by Regulatory Guide 1.59, is recommended for flooding protection of a safety-related intake. 2. Type of Flood Protection. The staff reviews the applicant’s proposed flooding protection measures with respect to the flooding design bases. If flood protection is required, the type of flood protection (“hardened facilities,” sandbags, flood doors, bulkheads, etc.) is reviewed. The staff should use the recommendations of Regulatory Guide 1.102 to determine the adequacy of flood protection from static and dynamic effects of floods. If there is evidence of potential structural effects from flooding, the staff requests that review of structural adequacy of flood protection be performed by the organization responsible for structural and mechanical design. 3. Emergency Procedures. The staff reviews the applicant’s proposed emergency procedures. Where the site is not “hardened,” that is, where emergency action is needed, the time available to implement emergency procedures should be estimated by analysis of the design-basis flood. The staff should interpret “hardened” flood