Document: NUREG-0800
Document ID: 9ec109d9-dfac-443f-a128-99771d0f5c88
Document Type: srp
Title: FLOODS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0701/ML070100647.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.2
CFR Part: 
CFR Title: 

Content:
due to stream blockage. 8. Effects of Ice Formation in Water Bodies The staff reviews formation of ice sheet on surface of water bodies, frazil and anchor ice, and ice dam formation inasmuch as these phenomena may result in flooding, e.g., from backwater effects resulting from a downstream ice blockage or from a flood wave resulting from collapse of an upstream ice dam. 9. Combined Events Criteria: The staff reviews the worst flooding at a site that may result from a reasonable combination of individual flooding mechanisms. Some or all of these individual mechanisms could be less severe than their worst-case occurrence but the combination may exceed the most severe flooding effects from the worst-case occurrence of any single mechanism. 10. Consideration of Other Site-Related Evaluation Criteria: The staff considers the potential effects of seismic and non-seismic information on the postulated design bases and how they relate to floods in the vicinity of the site and the site region. 11. Additional Information for 10 CFR Part 52 Applications: Additional information will be presented dependent on the type of application. For a COL application, the additional information is dependent on whether the application references an ESP, a DC, both, or neither. Information requirements are prescribed within the “Contents of Application” sections of the applicable Subparts to 10 CFR Part 52. Review Interfaces Other SRP sections interface with this section as follows: 1. Sections 2.4.3 - 2.4.7, and Section 2.4.9 address specific flood-producing phenomena. The types of events considered in these sections and the controlling flooding event are described in this section. 2. Flooding protection measures, including dynamic effects (hydrodynamic forces and impact forces from debris and projectiles), if required for safety-related SSC, are described in Section 2.4.10. 3. The organization responsible for review of issues related to hydrology also reviews, under SRP Section 2.3.6