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:
component discharge lines to detect leakage. An alternative means is to prevent leakage from occurring by operating the system at higher pressure to ensure that leakage is in the preferred direction. d. The system is designed to provide cooling to the reactor coolant pump seals and bearings during normal plant operating conditions, anticipated transientsanticipated operational occurrences, and following postulated 62 accidents. Instrumentation in accordance with IEEE 279 IEEE Std 603 as endorsed by Regulatory Guide 1.153, with alarms in the control room should be 63 provided to detect a loss of cooling water in order to ensure that a period of 20 minutes is available to the operator to initiate manual protection of the plant, if necessary. It has been demonstrated by testing that the reactor coolant pumps could potentially operate with loss of cooling water for 20 minutes without the need for operator action. As an alternative to pump testing, the reviewer verifies that: (1) Instrumentation in accordance with IEEE 279 is provided consistent with the criteria for the protection system to initiate automatic protection of the plant upon loss of water to a pump. For this case, the component cooling water supply to the seal and bearing of the pump may be designed to nonseismic Category I requirements and Quality Group D, or (2) The component cooling water supply to each pump is designed to be capable of withstanding a single active failure or a moderate-energy line crack as defined in Branch Technical Position ASB 3-1 and to seismic DRAFT Rev. 4 - April 1996 9.2.2-14 Category D, Quality Group C, and ASME Section III, Class 3 requirements.64 e. For new PWRs applications, design provisions are made to provide for RCP seal integrity during station blackout. Acceptable provisions 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