Document: NUREG-0800
Document ID: 5ba2907e-cf47-4a3b-b320-616735faa4cf
Document Type: srp
Title: AUXILIARY FEEDWATER SYSTEM (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052350095.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.4.9
CFR Part: 
CFR Title: 

Content:
ilure of non-essential equipment or components does not affect essential functions of the system. 4. The system is capable of withstanding a single active failure. 5. The system possesses diversity in motive power sources such that system performance requirements may be met with either of the assigned power sources, e.g., a system with an a-c subsystem and a redundant steam/d-c subsystem. 6. The system design precludes the occurrence of fluid flow instabilities, e.g., water hammer, in system inlet piping during normal plant operation or during upset or accident conditions (see SRP Section 10.4.7). 7. Functional capability is assured by suitable protection during abnormally high water levels (adequate flood protection considering the probable maximum flood). This review is performed according to SRP Section 3.4.1. 8. The capability exists to detect, collect, and control system leakage and to isolate portions of the system in case of excessive leakage or component malfunctions. 9. Provisions are made for operational testing. 10. Instrumentation and control features are provided to verify the system is operating in a correct mode. 11. The system is capable of automatically initiating auxiliary feedwater flow upon receipt of a system actuation signal. 12. The system satisfies the recommendations of Regulatory Guide 1.62 with respect to the system capability to manually initiate protective action by the auxiliary feedwater system. 13. The system design possesses the capability to automatically terminate auxiliary feedwater flow to a depressurized steam generator, and to automatically provide feedwater to the intact steam generator. Or as an alternative if it is shown that the intact steam generator will recieve the minimum required flow without isolation of the depressurized steam generator and containment design pressure is not exceeded, then operator action may be relied upon to isolate the depressurized steam generator. 10.4.9-2 Rev. 2- - July 1981 14. The system