Document: NUREG-0800
Document ID: a35b0293-07ff-4bdb-9950-454f3a0e970e
Document Type: srp
Title: ICE EFFECTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070249.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.7
CFR Part: 
CFR Title: 

Content:
es. The phrase "historical low water ice affected" or similar phrases in stream flow records (USGS and State publications) will alert the reviewer to the potential for ice effects. The following 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 portion of low-grade heat to the intake) to assure ensure 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 protected from icing as in item (2), above. If not this cannot be shown, it must be demonstrated that alternate 13 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, consideration of potential impact forces on the safety-related intakes must be a 14 consideration in the design basis. The dynamic loading caused by floating ice must be included in the structural design basis. (5) If ice blockage of the river or estuary is possible, it must be demonstrated that the resulting water level in the vicinity of the site has been considered in establishing the flood and water supply design bases. If this water level would adversely affect the intake