Document: NUREG-0800
Document ID: cbcf5b42-aac8-43cf-a267-4f72f2392f37
Document Type: srp
Title: HYDROLOGIC DESCRIPTION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0701/ML070100646.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.1
CFR Part: 
CFR Title: 

Content:
ential for underestimating the severity of such events, based on probabilistic considerations only. This problem can be avoided by using a deterministic approach to assess design basis events. Such an approach will account for the practical physical limitations of natural phenomena to contribute to the severity of a given event. This criterion is relevant to SRP Section 2.4.1 in that it specifies the hydrological phenomena that should be considered in the section. In general terms, it also specifies the level of conservatism that should be used to assess the severity of these phenomena when determining the appropriate design bases for structures, systems, and components important to safety. This is a similar standard as that applied in reviewing ESPs or COLs for hydrologic site characteristics. 2. Sections 100.10(c) and 100.20(c) of 10 CFR Part 100 require that physical characteristics of a site (including seismology, meteorology, geology, and hydrology) be taken into account to determine its acceptability for a nuclear power reactor. In addition, these sections address the hydrologic characteristics of a proposed site that may affect the consequences of an escape of radioactive material from the facility. Special precautions are required if a reactor is to be located on a site where significant quantities of radioactive effluent might accidentally flow into nearby streams or rivers or might find ready access to ground water. To satisfy the hydrologic requirements of 10 CFR Part 100, the applicant’s SAR should contain a description of the surface and subsurface hydrologic characteristics of the site and region. This description should be sufficient to assess the acceptability of the site and the potential for those characteristics to influence the design of the plant SSC that are important to safety. Meeting this requirement provides a level of assurance that the nuclear power plant is designed to withstand appropriately severe hydrologic phenomena. Further, it