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:
of 10 to 10 per demand exclusive of station blackout scenariosbased on an -4 -5 analysis using methods and data presented in NUREG-0611 and NUREG-0635. 48 Compensating factors such as other methods of accomplishing the safety functions of the AFWS or other reliable methods for cooling the reactor core during abnormal conditions may be considered to justify a larger unavailability of the AFWS. 6. General Design Criterion 45, as related to design provisions made to permit periodic inservice inspection of system components and equipment. 7. General Design Criterion 46, as related to design provisions made to permit appropriate functional testing of the system and components to assure structural integrity and leak-tightness, operability and performance of active components, and capability of the integrated system to function as intended during normal, shutdown, and accident conditions. In meeting this criteria the technical specifications should specify that the monthly AFWS pump test shall be performed on a staggered test basis to reduce the likelihood of leaving more than one pump in a test mode following the tests. 8. 10 CFR 50.63, as related to the design provisions for withstanding and recovering from a station blackout, including an acceptable degree of independence from the ac power system and the capability for removal of decay heat at an appropriate rate for an 10.4.9-7 DRAFT Rev. 3 - April 1996 appropriate duration. Acceptance is based upon meeting the applicable positions of Regulatory Guide 1.155 as related to the AFWS design.49 Technical Rationale:50 The technical rationale for application of the above acceptance criteria to the auxiliary feedwater system is discussed in the following paragraphs. 1. GDC 2 requires that structures, systems and components (SSCs) important to safety shall be designed to withstand the effects of earthquakes. Regulatory Guide 1.29 position C.1 identifies those structures, systems and components that should be designed as seismic