Document: NUREG-0800
Document ID: eea126bc-3192-4a98-b937-2f09794010cd
Document Type: srp
Title: COOLING WATER SUPPLY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340556.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.11
CFR Part: 
CFR Title: 

Content:
he water will be 11 feet and the pond's embankment will have a freeboard of 5 feet. The submerged intake and discharge pipes will be located at the same end of the pond but separated by a dike running almost the entire length of the pond to prevent short-circuiting between the intake and discharge. The pond must be capable of providing cooling water below the design temperature of 1100 Fahrenheit under normal or emergency conditions. The applicants analyzed the ponds thermal performance assuming a loss-of-coolant accident in one unit, a simulataneous normal shut- down in the other, and meteorological conditions of the severity specified in Regulatory Guide 1.27, "Ultimate Heat Sink for Nuclear Power Plants." The maximum pond temperature calculated was 109.30 Fahrenheit. We independently modeled the thermal performance of the pond and conclude that it is capable of providing cooling water below the design temperature of 1100 Fahrenheit. We conservatively estimated maximum water losses from the pond, assuming meteorological condi- tions of the severity specified in Regulatory Guide 1.27, and conclude that the initial pond inventory will be sufficient to provide at least a 30-day cooling water supply without makeup. We evaluated the potential effects of freezing events on the pond's capability of providing emergency cooling water to the plant. Our analysis showed that the intake and discharge pipes will be below the maximum depth of pond freezing that could occur under meteoro- logical conditions of the severity suggested in Regulatory Guide 1.27. In addition, to prevent freezing around the intake and discharge pipes, the intake pumphouse will be heated and the discharge piping will be buried below the frost line, heat traced or the discharge structure will be heated. We have evaluated the performance of the proposed cooling pond and conclude that, under meteorological conditions of the severity described in Regulatory Guide 1.27, (1) the design will provide suffi-