Document: NUREG-0800
Document ID: 5d71ab44-4cbd-4694-9e2c-eb9b02b902ef
Document Type: srp
Title: ICE EFFECTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340546.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.7
CFR Part: 
CFR Title: 

Content:
ly. To meet the requirements of 10 CFR Part 50, §50.55a, GDC 2, and 10 CFR Part 100 as they relate to ice effects the following specific criteria are used: A. Publications of the National Oceanic and Atmospheric Administration (NOAA), the United States Geologic Survey (USGS), the Corps of Engineers, and other sources are used to identify the history and potential for ice formation in the region. Historical maximum depths of icing should be noted, as well as mass and velocity of any large floating ice bodies. The phrase "historical low water ice affected" or similar phrases in streamflow records (USGS and state publications) will alert the reviewer to the potential for ice effects. The follow- ing items must be considered and evaluated, if found necessary, in the design of protection of safety-related facilities and water supplies. (1) The regional ice and ice jam formation history must be described to enable an independent determination of the need for including ice effects in the design basis. (2) If icing has not been severe, based on regional icing history, design considerations must be presented (e.g., return of a por- tion of low-grade heat to the intake) to assure that icing or ice blockage of intake screens and pumps will not adversely affect safety-related facilities and water supplies. (3) If the potential for icing is severe, based on regional icing history, it must be shown that water supplies capable of meeting safety-related requirements are available from under the ice formations postulated and that safety-related equipment is pro- tected from icing as in item (2), above. If not, it must be demonstrated that alternate sources of water are available, that they are protected from freezing, and that the alternate source is capable of meeting safety-related requirements in such situations. Ice loading must have been included in the structural design basis, if severe icing is possible. - (4) If floating ice is prevalent, based on regional icing history,