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:
e secondary layer will be 3.5 feet thick with 600-pound to 1000-pound stone; and the filter layer will'be 1.5 feet thick with 30-pound to 50-pound stone. The staff independently evaluated the.proposed design using-the Coastal Engineering Research Center's "Shore Protection Manual" and 2.4.10-3 Rev. 2 - July 1981 concluded that the proposed breakwater design was conserative and therefore meets the criteria of 10 CFR Part 50, §50.55a. During the probable maximum surge, the breakwater will be submerged by up to 3.9 feet of water (maximum stillwater elevation is 586.9 feet). Waves that would impinge on safety-related structures are limited by this maximum depth of water, and the maximum breaking wave that can be supported in this depth of water is approximately 3 feet. Waves that are transmitted over the breakwater will approach the service building and radwaste building which are nearest to the lake. These buildings are not seismic Category I structures, but do afford some protection for seismic Category I structures from direct wave attack. Waves travelling around the ends of the breakwater, however, can reach and runup on seismic Category I structures, and the applicant used the resulting wave forces in the design of the structures. Seismic Category I structures considered in these analyses were the reactor building, the auxiliary building, and the residual heat removal building. In addition to considering the wave forces under the above postulated conditions, the applicant also provided airlocked and waterproofed doors that are normally closed for all openings in seismic Category I structures that are below the level of the maximum wave runup. We therefore conclude that the design of these structures meets the requirements of 10 CFR Part 50, §50.55a with respect to wave forces. We have independently evaluated the effects of the probable maximum surge stillwater elevation plus wind-generated waves on all seismic Category I structures and have concluded that the