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:
at 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 protection (as discussed in Regulatory Guide 1.59 for facilities identified in Regulatory Guide 1.29) to mean “almost always in place.” 2.4.10-7 Revision 3 - March 2007 The environmental conditions likely to prevail during all potential flooding events up to and including events of the severity of the controlling event are reviewed to establish the minimum time available for implementation of emergency procedures. The physical parameters such as rate-of-rise (of river or lake levels), as well as evaluation (based on experience and engineering judgment) of flood warning networks, provide the staff with an independent estimate of available time. This data is provided to organizations responsible for the review of issues related to plant emergency procedures for their independent evaluation of the time required to implement shutdown and flood protection measures. If the environmental conditions likely are such that the procedures can be carried out, they will be considered acceptable. An appropriate item in the plant Technical Specifications should be provided in cases where emergency procedures are required to ensure adequate flood protection. For those plants for which shutdown (if recommended under Regulatory Guide 1.59, Position 2) and installation of protective measures is required in the event of a major flood, the procedures for carrying out these measures are reviewed by the organization responsible for the review of issues related to technical specifications for compatibility of available and required times as established above. The Technical Specifications should reference an emergency plan which allows for the orderly installation of required flood protection. 4. Consideration of Other Site-Related Evaluation Criteria. 10 CFR Part 100 describes site-related