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:
ystem can 58 remove residual heat over the entire range of reactor operation and cool the plant to the decay heat removal system cut-in temperature. This review is performed by RSBSRXB upon request as indicated in subsection I of this SRP section. 59 3. The reviewer verifies that the design has features to meet the generic recommendations of NUREG-0611 and -0635. For additional short term recommendation No. 2 regarding AFW pump endurance tests, a 48 hour test is acceptable rather than the 72 hour test specified in the NUREGS. The ASBSPLB reviewer coordinates with the ICSBHICB 60 61 reviewer to assure that the instrumentation and control system aspects of these recommendations are met by the system design. 4. The reviewer verifies that an AFWS reliability evaluation has been performed in accordance with 10 CFR 50.34(f)(1)(ii) as clarified in item II.E.1.1 of NUREG-0737. 62 The reliability analysis is reviewed to determine the potential for AFW system failure under various loss of main feedwater transients. The AFWS unreliability is determined based on analysis using methods and data presented in NUREG-0611 and NUREG-0635. As an alternative to determining AFWS unreliability using the methods 63 of NUREG-0611 and -0635, AFWS unreliability may be established through probabilistic risk assessment methods accepted by the staff [e.g., NUREG/CR 2300 (Reference 19) and NUREG/CR 2815 (Reference 20)]. The acceptance criteria of 10 to -4 10 per demand (exclusive of station blackout scenarios) must be met regardless of the -5 method selected.64 5. The reviewer coordinates with the EELB to assure that the AFWS has sufficient capability, capacity, and independence from essential and nonessential ac power to provide adequate decay heat removal for withstanding or coping with, as applicable, and recovering from, a station blackout in accordance with 10 CFR 50.63 and Regulatory Guide 1.155, Positions C.3.2.2, C.3.3.2, and C.3.3.4.65 For standard design certification reviews under 10