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:
t of conservatism that must be used to determine the severity of icing phenomena for the purpose of assessing the adequacy of the codes and quality standards used to design, fabricate, erect, and test structures, systems, and components important to safety. Meeting the requirements of GDC 1 provides assurance that plant structures, systems, and components will perform their intended safety functions under the most severe icing conditions likely to occur.17 2. Compliance with GDC 2 requires that nuclear power plant structures, systems, and components important to safety be designed to withstand the effects of natural phenomena such as earthquake, tornado, hurricane, flood, tsunami, and seiche without loss of capability to perform their safety functions. The criterion further specifies that the design bases for these structures, systems, and components shall reflect the following: a. Appropriate consideration of the most severe natural phenomena historically reported for the site and its 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 those of the natural phenomena; and c. The importance of the safety functions to be performed. GDC 2 applies to this SRP section because the reviewer verifies that structures, systems, and components important to safety (e.g., the cooling water intake structure) are not adversely affected by floating ice, ice jams, and ice blockage to the extent that they might be unable to perform their intended safety function. SRP Section 2.4.7 addresses the 2.4.7-5 DRAFT Rev. 3 - April 1996 potential effects of ice on the hydrologic characteristics of the plant site. In general terms, it also specifies the amount of conservatism that must be used to determine the severity of icing phenomena for the purpose of assessing the adequacy of the design bases used for structures,