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:
monstrated 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 structure, or other safety-related facilities, it must be demonstrated that an alternate safety-related water supply will not also be adversely affected. B. The applicant's estimates of potential ice flooding or low flows are acceptable if the estimates are no more than 5% less conservative than the staff's estimates. If the applicant's estimates are more than 5% less conservative than the staff's, the 1 applicant should fully document and justify its estimates or accept the staff's DRAFT Rev. 3 - April 1996 2.4.7-4 estimates and redesign applicable flood protection. The suggested criteria of Regulatory Guide 1.27 apply when the water supply comprises part of the ultimate heat sink. Technical Rationale15 The technical rationale for application of these acceptance criteria to reviewing ice effects on a nuclear power plant site is discussed in the following paragraphs:16 1. Compliance with GDC 1 requires that structures, systems, and components be designed, fabricated, erected, and tested to quality standards commensurate with the importance of the safety functions to be performed. GDC 1 applies to this SRP section because the reviewer verifies that structures, systems, and components important to safety (e.g., the ultimate heat sink or 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 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 codes and quality standards used to design, fabricate, erect, and test