Document: NUREG-0800
Document ID: ebff6c02-bdd3-4751-9e36-9347caf05c8e
Document Type: srp
Title: and 2.4.6 are applicable to low water estimates due to the various phenomena discussed.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070258.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.5
CFR Part: 
CFR Title: 

Content:
affected, a statement of the staff's position (bases) will be made. A similar finding on the design bases for the ultimate heat sink will be made. If technical specification requirements are needed to assureensure an 65 adequate supply, they will be indicated in the CP, statementESP, or COL safety evaluation report (SER) and required for operation. 66 For operating license (OL) reviews of plants for which detailed low water reviews were done at the CP stage, the CP conclusions will be referenced. For review of a plant proposed for a site that has been granted an early site permit, the early site permit's conclusions regarding low water reviews will be referenced. In addition, the results of a review to reaffirm the low water design 67 bases will be noted. If no changes have been made to the ultimate heat sink design since the CP review, the conclusions of the CP will be referenced. However, for both the low water considerations and the ultimate heat sink, an evaluation will be made during the OL review to assureensure that the design bases have been properly implemented. The availability of 68 long-term water supply will be noted. If no low water and ultimate heat sink review was undertaken at the CP or ESP stage (of the scope described), this fact will be noted also. 69 A sample CP-stage statement follows: The normal water supply for the station will be obtained from Lake A. Emergency cooling water will be furnished by the ultimate heat sink reservoir which is not dependent upon the water level in Lake A for its safety function. 2.4.11-11 DRAFT Rev. 3 - April 1996 The minimum lake elevation needed for operation of the pumps supplying makeup water for the circulating and the service water systems is 169.0 meters (554.6 feet) above 70 International Great Lakes Datum 172.5 meters [(566.1 feet) above mean sea level]. 71 The lowest lake level observed at B City during the 70 years of record was 172.4 meters (565.7 feet) above International Great Lakes Datum 172.9 meters