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:
or system testing, minimum performance and surveillance developed as a result of the staff's review. Upon request from the primary reviewer, the coordinating review branches will provide input for the areas of review stated in subsection I. The primary reviewer obtains and uses such input as required to assure that this review procedure is complete. For the purpose of this SRP section, a typical system is assumed which has redundant auxiliary feedwater trains, with a 50% capacity motor-driven pump in each train feeding directly to the steam generators, and a 100% capacity steam turbine-driven pump able to supply either of the redundant trains. The pumping capacity should permit the system to hold the plant at hot standby and subse- quently to cool down the reactor at specified cooldown rates. The 50% capacity pump is assumed to have sufficient capacity for decay heat removal following any accident or transient although cooldown to RHR cut in temperature may take longer than design. This requirement should also be met for conditions involving a small break area loss-of-coolant accident (LOCA) or a pipe break outside containment. For cases where there are variations from the-typical arrangement, the reviewer adjusts the review procedures to suit the design. However, the system design is required to meet the acceptance criteria given in subsection II. 10.4.9-5 Rev. 2- - July 1981 1. The SAR is reviewed to determine that the system description and piping and instrumentation diagrams (P&IDs) identify the AFWS equipment and arrangement that is used for normal operation and for safe plant shutdown (essential) operation. The system P&IDs, layout drawings, and component descriptions and characteristics are then reviewed to verify that: a. Minimum performance requirements for the system are sufficient for the various functions of the AFWS. b. Essential portions of the AFWS are isolable from non-essential portions, so that system performance is not impaired in the event of a