Document: NUREG-0800
Document ID: 6d6e43af-f998-40fc-9062-1277b9cebd60
Document Type: srp
Title: REACTOR AUXILIARY COOLING WATER SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350544.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.2
CFR Part: 
CFR Title: 

Content:
y to detect leakage of radioactivity or chemical contamination from one system to another. Radioactivity monitors and conductivity monitors should be located in the system 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, antici- pated transients, and following postulated accidents. Instrumenta- tion in accordance with IEEE 279 with alarms in the control room should be 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 poten- tially 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 consist- ent 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 9.2.2-8 Rev. 3 - June 1986 (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 Category D, Quality Group C, and ASME Section III, Class 3 requirements. 5. The reviewer verifies that the system has been designed so that system functions will be maintained as required in the event of adverse environ- mental phenomena such as earthquakes, tornadoes, hurricanes, and floods. The reviewer evaluates the system