Document: NUREG-0800
Document ID: 5292500f-1078-455c-aa35-aea15092636c
Document Type: srp
Title: ENGINEERED SAFETY FEATURES SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1602/ML16020A082.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.3
CFR Part: 
CFR Title: 

Content:
plicant’s or licensee’s commitment regarding these design criteria. For computer-based ESFAS, guidance is provided by IEEE Std 7-4.3.2 as endorsed by RG 1.152. These procedures are detailed in SRP Appendix 7.1-B for IEEE Std 279-1971, SRP Appendix 7.1-C for IEEE Std 603-1991, and SRP Appendix 7.1-D for IEEE Std 7-4.3.2. SRP Appendices 7.1-B and 7.1-C discuss the requirements of IEEE Std 279-1971 and IEEE Std 603-1991 and how they are used in the review of the ESFAS. SRP Appendix 7.1-D discusses the criteria of IEEE Std 7-4.3.2 and how they are used in the review of the ESFAS. Although the primary emphasis is on the equipment comprising the ESFAS, the reviewer must consider the overall ESF functions at the system level. The ESFAS design should be compatible with the accident analyses. It is not sufficient to evaluate the adequacy of the ESFAS only on the basis of the design meeting the specific requirements of IEEE Std 279-1971 or IEEE Std 603-1991. The ESFAS review should address the applicable topics identified as applicable in SRP Table 7-1. SRP Appendix 7.1-A describes review methods for each topic. Major design considerations that should be emphasized in the ESFAS review are identified below. A. Design basis - See SRP Appendix 7.1-B, Subsection 3 or SRP Appendix 7.1-C, Subsection 4. B. Single-failure criterion - See SRP Appendix 7.1-B, Subsection 4.2 or SRP Appendix 7.1-C, Subsection 5.1. C. Quality of components and modules-See SRP Appendix 7.1-B, Subsection 4.3 or SRP Appendix 7.1-C, Subsection 5.3. D. Independence - See SRP Appendix 7.1-B, Subsections 4.6 and 4.7 or SRP Appendix 7.1-C, Subsections 5.6 and 6.3. E. Completion of protective action - See SRP Appendix 7.1-B, Subsection 4.16 or SRP Appendix 7.1-C, Subsection 5.2. F. Diversity and defense-in-depth - ESFAS should incorporate multiple means for responding to each event discussed in the SAR Chapter 15, “Transient and Accident Analyses.” At least one pair of these means for each event should