Document: NUREG-0800
Document ID: 2200e046-1749-4aa1-a474-997b369b63b2
Document Type: srp
Title: REACTOR AUXILIARY COOLING WATER SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070513.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.2
CFR Part: 
CFR Title: 

Content:
. System drawings are reviewed to see that they show the means for accomplishing isolation and the SAR description is reviewed to identify minimum performance of the isolation valves. The drawings and description are reviewed to verify that automatically operated isolation valves separate nonessential portions and components from the essential portions. Special consideration is given to the case of redundant interconnected trains to assure ensure operation of at least one safety-related train by proper isolation in 56 the event of an accident or transient anticipated operational occurrences.57 b. Essential portions of the CWS, including the isolation valves separating seismic Category I portions from the nonseismic portions, are Quality Group C and seismic Category I. System design bases and criteria, and the component classification tables are reviewed to verify that the heat exchangers, pumps, valves, and piping of essential portions of the system will be designed to seismic Category I requirements in accordance with the applicable criteria. The review of seismic design is performed by the structural and geotechnical reviewer of DRAFT Rev. 4 - April 1996 9.2.2-12 (EB)ECGB and the review for seismic and quality group classification is 58 performed by the mechanical engineering reviewer of (EB)EMEB as indicated 59 in subsection I of this SRP section. c. The system is designed to provide water makeup as necessary. Cooling water systems that are closed loop systems are reviewed to ensure that the surge tanks have sufficient capacity to accommodate expected leakage from the system for seven days or that a seismic source of makeup can be made available within a time frame consistent with the surge tank capacity (time zero starts at low level alarm). The surge tank and connecting piping are reviewed to ensure that makeup water can be supplied to either header in a split header system. Redundant surge tanks (one to each header) or a divided surge tank design are