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:
odels: The application should provide a description of alternate conceptual models of site hydrology. These alternate conceptual models should be sufficiently detailed to reasonably bound hydrological conditions at the site. 6. Consideration of Other Site-Related Evaluation Criteria: The application should demonstrate that the potential effects of site-related proximity and of seismic and non-seismic information as they relate to hydrologic description in the vicinity of the proposed plant site and site regions are appropriately taken into account. Technical Rationale The technical rationale for application of these acceptance criteria to the areas of review addressed by this SRP section is discussed in the following paragraphs: 1. Pursuant to GDC 2, nuclear power plant SSC important to safety be designed to withstand the effects of natural phenomena such as earthquakes, tornadoes, hurricanes, floods, tsunami, and seiches without loss of capability to perform their safety functions. The GDC further specifies that the design bases for these SSC shall reflect the following: A. Appropriate consideration of the most severe of the natural phenomena that have been historically reported and the use of geological and physical data for the site and surrounding area, with sufficient margin for the limited accuracy, quantity, and time period in which the historical data have been accumulated; B. Appropriate combinations of the effects of normal and accident conditions with the effects of the natural phenomena; and 2.4.1-6 Revision 3 - March 2007 C. The importance of the safety functions to be performed. The first specification was adopted in recognition of the relatively short history available for severe natural phenomena on the North American continent and, as a result, the potential 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