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:
th the Geosciences-Branch (GB), the Accident Evaluation Branch (AEB), SEB, ASB, and PSB are undertaken where design criteria are not firmly established. The potential for surges in intake sumps (i.e., seiching in intake structures and surges in intake pipes) that could cause adverse effects are reviewed to assure that the effects have been properly incorporated for the intake design. The potential for adverse hydrodynamic effects of a trip of the intake pumps is evaluated based on potential surges in intake sumps. For multiple purpose (normal operation, normal shutdown, and emergency shutdown) water supply systems, the primary portion of the system is first reviewed to determine that the water supply will be maintained at minimum volume requirements at all times. The secondary portion of the system is then reviewed to determine whether an adequate.emergency water supply can be expected to be available during operating conditions such as the regional drought of record (flows must be adjusted for historical and potential future effects). If not, the applicant is requested to provide a technical specification requiring plant shutdown at the point where an adequate shutdown water supply is still assured. Institutional restraints on water use, such as limitations in water use'and discharge permits, are reviewed to assure the plant will have an adequate' supply and not exceed limitations imposed upon operation. If a conflict is 2.4.11-4 Rev. 2 - July 1981 foreseen, the applicant is requested to either obtain a variance or make a design change to accommodate the limitation.. The potential for blockage of the intakes by littoral drift and sediment is reviewed to assure that the intakes are located and sized to prevent blockage which would preclude use of the safety-related water supply. Applicable literature describing historic sediment accumulations in the site region is reviewed to determine if mitigative measures are required to protect safety- related facilities.