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:
and meets the requirements of 10 CFR Part 50, §50.55a and General Design Criterion 2. This conclusion is based upon the following analysis, which shows that position 2 of Regulatory Guide 1.27 is met with respect to ice blockage of essential water intakes. The safety-related pumps from the cooling lake are to be protected from ice blockage by means of traveling screens, stop logs, and trash racks located at the front of the lake screenhouse. In addition, the applicant proposes a warm-up line from the circulating water discharge which will keep the inlet water temperature'40'F during winter opera- tion. An essential cooling water screen bypass pipe is also available. We concur with the applicant that icing or ice flooding should not adversely affect the plant's safety-related facilities. V. IMPLEMENTATION The following is intended to provide guidance to applicants and licensees regarding the NRC staff's plans for using this SRP section. 2.4.7-4 Rev. 2 - July 1981 Except in those cases in which the applicant proposes an acceptable alternative method for complying with specified portions of the Commission's regulations, the method described herein will be used by the staff in its evaluation of conformance with Commission regulations. Implementation schedules for conformance to parts of the method discussed herein are contained in the referenced regulatory guides. VI. REFERENCES 1. 10 CFR Part 50, §50.55a, "Codes and Standards." 2. 10 CFR Part 50, Appendix A, General Design Criterion 2, "Design Bases for Protection Against Natural Phenomena." 3. 10 CFR Part 100, "Reactor Site Criteria." 4. E. Brown and G. C. Clark, "Ice Thrust in Connection with Hydro-Electric Design," Engineering Journal, pp. 18-25, 1932. 5. V. T. Chow (ed.), "Handbook of Applied Hydrology," McGraw-Hill Book Company, New York (1964). 6. 0. Devik, "Freezing Water and Supercooling,"'Jour. of Glaciology, Vol. 1, No. 6, pp. 307-309 (1949). 7. N. E. Dorsey, "Properties of Ordinary Water Substances,"