Document: NUREG-0800
Document ID: 5657a07e-c0b2-48ce-aaad-64d91609c4b3
Document Type: srp
Title: ICE EFFECTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0701/ML070100648.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.7
CFR Part: 
CFR Title: 

Content:
identified unique conditions. These review procedures are based on identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant's evaluation of how the proposed alternatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. 1. Historical Ice Accumulation: Publications of the National Oceanic and Atmospheric Administration (NOAA), the United States Geologic Survey (USGS), the U.S. Army Corps of Engineers (USACE), USACE Engineer Research and Development Center Cold Regions Research and Engineering Laboratory (CRREL), 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 2.4.7-6 Revision 3 - March 2007 streamflow records (USGS and State publications) will alert the reviewer to the potential for ice effects. Applicable literature describing historical occurrences of icing in the region is reviewed to determine if icing protection should be considered in the design of safety-related facilities. If considered necessary, the most likely types of icing conditions (floating ice, river blockage by ice buildup, frazil ice, etc.) are listed, and the potential impact on plant design of each type is identified. Criteria of the USACE and others provide a means of assessing icing impact and methods of mitigating adverse effects. For each type of icing condition, preliminary independent conservative estimates of the “worst case” will be made by either statistical or deterministic techniques. 2. High and Low Water Levels: The regional ice dam and ice jam formation history (e.g., from the USACE historical ice jam database) should be described to enable an independent determination of the need for including ice effects in the design basis.