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:
stone. The toe of the structure will be at 572.0 feet 174.3 m (572.0 ft) and the crest will be at 583.0 feet 177.7 m (583.0 ft). The 36 37 front (lakeward) slope will be 2 horizontal to 1 vertical. To determine the design wave for the breakwater, the toe was conservatively assumed to scour 3 feet 0.9 m (3 ft) to 38 elevation 569.0 feet 173.4 m (569.0 ft). The maximum significant breaking wave was 39 estimated to be 12.2 feet 3.7 m (12.2 ft) during the probable maximum surge. Based on 40 DRAFT Rev. 3 - April 1996 2.4.10-6 these conditions, the armor layer was designed to be 7.5 feet 2.3 m (7.5 ft) thick using 41 3.0-metric ton (3.3-ton) to 4.5 metric ton (5-ton) stone. Underlayers were specified as 42 43 follows: the secondary layer will be 3.5 feet 1.1 m (3.5 ft) thick with 600-pound 44 272-kg (600-lb) to 1000-pound 454-kg (1000-lb) stone; and 45 46 the filter layer will be 1.5 feet 0.5 m (1.5 ft) thick with 30-pound 14-kg (30-lb) 47 48 to 50-pound 23-kg (50-lb) stone. 49 The staff independently evaluated the proposed design using the Coastal Engineering Research Center's '"Shore Protection Manual" and concluded that the proposed breakwater design was conservative 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 1.2 m (3.9 ft) of water (maximum stillwater elevation is 586.9 feet 178.9 m or 50 586.9 ft). Waves that would impinge on safety-related structures are limited by this 51 maximum depth of water, and the maximum breaking wave that can be supported in this depth of water is approximately 3 feet 0.9 m (3 ft). Waves that are transmitted over the 52 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 traveling around the ends of the breakwater, however, can reach and runup on