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:
rized 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 possesses. sufficient auxiliary feedwater flow capacity so that a cold shutdown can be achieved. Upon request from ASB, the Reactor Systems Branch (RSB) will verify that the system meets the minimum flow requirements for decay heat removal. 15. The applicant's proposed technical specifications are such as to assure the continued reliability of the AFWS during plant operation; i.e., the limiting conditions for operation and the surveillance testing requirements are specified and are consistent with the Standard Technical Specifications. 16. In conjunction with the Instrumentation and Control Systems Branch (ICSB) the ASB verifies that the system design meets the generic short and long term recommendations identified in NUREGS-0611 and -D635. These recommendations will apply to all PWRs. 17. An AFWS reliability analysis is performed in accordance with Item II.E.l.1 of NUREG-0737 using the methodology defined by Appendix III and Annex 1 of Appendix X in NUREG-0611 and HUREG-0635 to determine the system reliabi- lity and major contributors to AFW system failure under various loss of main feedwater transients. The ICSB will evaluate the design to determine that the requirements and guidance of II.E.1.2 of NUREG-0737 are met. 18. The reviewer verifies that the system design has the capability to permit operation at hot shutdown for at least four hours followed by cooldown to the RHR cut-in temperature from the control room using only safety grade equipment and assuming the worst case single active failure in accordance with Branch Technical Postion RSB 5-1. Coordinated reviews are performed by other branches and the results used by the ASB to complete the overall evaluation of the system. The coordinated reviews are as follows. The RSB identifies any functional interfaces