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:
s of Engineers and others provide a means of assessing icing impact and methods of mitigating adverse effects. For each type of icing condi- tion, preliminary independent estimates of the "worst case" will be made by either conservative statistical or deterministic techniques. If the applicant's estimates of ice effects are comparable to the staff's pre- liminary analysis, the staff will concur with the applicant's estimates. If the preliminary analysis indicates the applicant's estimates of ice effects are not comparable to the staff's estimates, the staff's analysis will be repeated using more realistic techniques. The above reviews are performed only when applicable to the site or site regions. Some items of review may be done on a generic basis. IV. EVALUATION FINDINGS For construction permit (CP) reviews, the findings will summarize the applicant's and staff's estimates of the potential for ice flooding, ice blockage of water intakes, ice forces on structures, and the minimum low water levels (from upstream ice blockage). If the applicant's estimates are within acceptable margins. (described in Acceptance Criteria), staff concurrence with the appli- cant's estimate will be stated. If the applicant's estimates are not within acceptable margins or, if the staff predicts potential blockage of the intake, or. if the proposed plant may be adversely affected, a statement of the staff *Based on the difference between normal water levels and the flood event or low water. 2.4.7-3 Rev. 2 - July 1981 bases will be made. If the icing conditions do not constitute a design basis, the findings will so indicate. For operating license (OL) reviews of plants for which detailed icing reviews were made at the CP stage, the CP conclusions will be referenced. However, a review will be made to assure that the design basis established in the CP review has been implemented properly. In addition, a review of icing records since the CP review will be made. If no CP review was undertaken