Document: NUREG-0800
Document ID: b3542dd9-b995-4eba-aa6c-0f8f08f8c772
Document Type: srp
Title: FLOODS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340525.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.2
CFR Part: 
CFR Title: 

Content:
Failure during other earthquakes, coincident with runoff, surge, or seiche floods where the coincidence is at least as likely as for 5.a and 5.b above. 6. Flooding caused by landslides a. Flood waves. 2.4.2-2 Rev. 3 - April 1989 b. Backwater effects due to stream blockage. 7. Ice loadings from water bodies II. ACCEPTANCE CRITERIA Acceptance criteria for this SRP section relate to the following regulations: 1. General Design Criterion 2 (GDC 2) as it relates to structures, systems, and components important to safety being designed to withstand the effects of hurricanes, floods, tsunami, seiches. 2. 10 CFR Part 100 as it relates to identifying and evaluating hydrologic features of the site. To meet the requirements of the hydrologic aspects of GDC 2 and 10 CFR Part 100, the following specific criteria are used: For SAR Section 2.4.2.1 (Flood History): The potential flood sources and flood response characteristics identified by the staff's review (de- cribed in Review Procedures) are compared to those of the applicant. If similar the applicant's conclusions are accepted. If, in the staff's opinion, significant discrepancies exist, the applicant will be requested to provide additional data, reestimate the effects on the plant, or revise the applicable flood design bases, as appropriate. For SAR Section 2.4.2.2 (Flood Design Considerations): The applicant's estimate of controlling flood levels is acceptable if it is no more than 5% less conservative than the staff's independently determined (or veri- fied) estimate. If the applicant's SAR estimate is more than 5% less conservative, the applicant should fully document and justify its esti- mate of the controlling level. On the other hand, the applicant may accept the staff's estimate and redesign applicable flood protection. For SAR Section 2.4.2.3 (Effects of Local Intense Precipitation): The applicant's estimates of local probable maximum precipitation (PMP) and the capacity of site drainage facilities (including