Document: NUREG-0800
Document ID: 2cb61281-91f4-400a-8eda-41e187e51d77
Document Type: srp
Title: AUXILIARY FEEDWATER SYSTEM (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070570007.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.4.9
CFR Part: 
CFR Title: 

Content:
ic Category I requirements because system operation is necessary to mitigate the consequences of an accident. This design includes an automatic seismic Category I, tornado-protected supply of water to the auxiliary feedwater pump suction. Based on the review of the applicant's proposed design criteria, design bases and safety classification for the auxiliary feedwater system, and system performance requirements during normal, abnormal, and accident conditions, the staff concludes that the design of the auxiliary feedwater system and supporting systems is acceptable and meets the Commission's regulations in 10 CFR 50.62, 10 CFR 50.63, and GDCs 2, 4, 5, 19, 34, 44, 45, and 46. This conclusion is based on the following: 1. The applicant has met the requirements of GDC 2 with respect to protection against the effects of earthquakes. The safety-related portions of the AFWS are designed to seismic Category I requirements in accordance with position C.1 of RG 1.29 and the nonsafety-related portions are designed in accordance with position C.2 of RG 1.29. 2. The applicant has met the requirements of GDC 2 with respect to protection against the effects of tornadoes. The safety-related portions of the AFWS are designed to withstand the effects of a design bases tornado as described in RGs 1.76 and 1.117. 3. The applicant has met the requirements of GDC 2 with respect to protection against the effects of floods. The safety-related sections of the AFWS are designed to withstand the effects of floods as described in RGs 1.59 and 1.102. 4. The applicant has met the requirements of GDC 4 with respect to protection against the effects of pipe breaks and missiles. Acceptance is based on the locations of AFWS 10.4.9-15 Revision 3 - March 2007 pumps and trains in individual cubicles which separate redundant components and are protected against the effects of internal and external missiles. 5. The applicant has met the requirements of GDC 5 with respect to sharing of SSCs. Acceptance