Document: NUREG-0800
Document ID: 2925ed14-c49b-459b-8786-e6bffd2c43c4
Document Type: srp
Title: AUXILIARY FEEDWATER SYSTEM (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070603.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.4.9
CFR Part: 
CFR Title: 

Content:
, valves, and piping, with respect to their functional performance as affected by adverse environmental occurrences, abnormal operational requirements, and off-normal conditions, e.g., small breaks in the primary system or the loss of offsite power. The system is reviewed to determine that a single malfunction, a failure of a component, or the loss of a cooling source does not reduce the safety-related functional performance capabilities of the system. The ASBSPLB review assures that: 5 1. System components and piping have sufficient physical separation or shielding to protect the essential portions of the system from the effects of internally and externally generated missiles. This review is performed according to SRP Section 3.5.1.1 for internally generated missiles and Sections 3.5.1.4 and 3.5.2 for externally generated missiles. 2. The system is protected against the effects of pipe whip and jet impingement that may result from high or moderate energy piping breaks or cracks. This review is performed according to SRP Section 3.6.1. 3. The failure 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