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:
ns include a diverse injection/cooling system that may be powered from the alternate ac (AAC) source for station blackout and that is independent of non-AAC source-backed injection/cooling systems and associated support systems to the extent practicable. Where a system for RCP seal injection/cooling is required specifically to meet the station blackout duration, the system should conform with position C.3.3.4 of Regulatory Guide 1.155 regarding ability to actuate and control the system from appropriate locations. As an alternative to providing for independent RCP seal cooling, the applicant may provide adequate testing data in support of the proposed RCP seal design, thus demonstrating that seal integrity will be maintained after extended loss of seal injection and cooling.65 f. Design provisions are made for isolation of component cooling water supply and return lines to the RCP by remote manual means only. Design provisions are made to ensure that the control room operator has the necessary information to determine when it is appropriate to isolate the lines by remote manual means and how soon the lines should be isolated if the lines become a release path from the containment during a LOCA. 66 5. The reviewer verifies that the system has been designed so that system functions will be maintained as required in the event of adverse environmental phenomena such as earthquakes, tornadoes, hurricanes, and floods. The reviewer evaluates the system using engineering judgment and the results of failure-modes and -effects analyses to determine the following: a. The failure of portions of the system or of other systems not designed to seismic Category I standards and located close to essential portions of the system or of nonseismic Category I structures that house, support, or are close to essential portions of the CWS, will not preclude essential functions. The review will identify these nonseismic category components or piping and ensure that appropriate criteria are