Document: NUREG-0800
Document ID: 81f4143f-227f-4d30-9822-097124aa5c05
Document Type: srp
Title: FLOODS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070240.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.2
CFR Part: 
CFR Title: 

Content:
, but generally will be concerned with increased accuracy in stream flow and water level predictions rather than with substantive changes in the flows and levels predicted. Where the OL review reveals that the controlling flood level differs more than 5% less conservatively from the CP evaluation, any supplemental provisions needed in the flood protection design basis should be directed toward early warning measures and procedures for ensuring safe shutdown of the plant or toward minor structural modification to accommodate the design flood level. DRAFT Rev. 4 - April 1996 2.4.2-6 For standard design certification reviews, site-related parameters, including limiting water level due to all sources of flooding, should be identified in the site parameter envelope. The specified value should be representative of credible, bounding characteristics. The reviewer verifies that the flood level specified in the site parameter envelope is consistent with the acceptance criteria given in subsection II of this SRP section. For an application referencing a certified standard design, the reviewer verifies that historical data are consistent with the flood level specified in the site parameter envelope for the certified design. Requirements and procedures governing issuance of early site permits for approval of proposed sites for nuclear power facilities are specified in 10 CFR Part 52. Information required for such a permit includes a description of the site's flood-related hydrologic characteristics. For this type of permit, the scope and level of detail for reviewing hydrologic data parallel those used for CP reviews as outlined above.12 For SAR Section 2.4.2.1 (Flood History): The staff will review publications of the U.S. Geological Survey (USGS), National Oceanic and Atmospheric Administration (NOAA), Soil Conservation Service (SCS), Corps of Engineers, applicable State and river basin agencies, and others to ensure that historical maximum events and the flood response