Document: NUREG-0800
Document ID: b5ea3f55-f54e-45cf-b921-3944d12b4ce2
Document Type: srp
Title: REACTOR AUXILIARY COOLING WATER SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350545.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.2.2
CFR Part: 
CFR Title: 

Content:
functional reliability. The effects of loss of cooling water to RCP seals as a result of loss of power will be 9.2.2-7 Rev. 2 - April 1984 reviewed as indicated in Task Action Plan items II.K.2.16 and II.K.3.25 of NUREGs-0718 and 0737. 4. The system design information and drawings are analyzed to ensure that the following features will be incorporated. a. A leakage detection system is provided to detect component or system leakage. An adequate means for implementing this criterion is to provide sumps or drains with adequate capacity and appropriate alarms in the immediate area of the system. b. Components and headers of the system are designed to provide indi- vidual isolation capabilities to ensure system function, control system leakage, and allow system maintenance. c. Design provisions are made to ensure the capability 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