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:
the review of certified design material (CDM) for the standard design, including the site parameters, interface criteria, and ITAAC.31 IV. EVALUATION FINDINGS For CP and early site permit reviews, the findings will consist of statements of flood design 32 bases for safety-related facilities. If emergency procedures are required, the findings will indicate staff conclusions that time for implementation and methods of providing flood protection provide the necessary protection. For OL and COL reviews the findings will 33 indicate the flood protection measures provided for safety-related facilities, and will indicate the type of technical specifications required to assure ensure that the protection will be in place. If Regulatory Guide 1.59, Position 2, is elected by the applicant, a statement describing lesser design bases will be included in the findings with the staff's conclusion of adequacy. A sample CP-stage statement follows: The staff concludes that the flood protection design of the plant is acceptable and meets the requirements of 10 CFR Part 50, 50.55a, GDC 2, and 10 CFR Part 100. This conclusion is based upon the following evaluation: The probable maximum surge produces a maximum calculated stillwater level that is 3.9 feet 1.2 m (3.9 ft) above the plant grade elevation (583.0 feet) (177.7 m or 583.0 ft). 34 35 Wave runup associated with the coincident wind wave activity results in calculated flooding levels at safety-related structures that are higher than the stillwater level. Subsequent to our review of the preliminary safety analysis report, the applicant proposed a breakwater fronting the plant to attenuate the effects of the probable maximum meteorological event on plant structures. The breakwater will be a rubble mound structure using an armor cover of 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