Document: NUREG-0800
Document ID: b9958157-a0b8-4321-b294-effbf265eda5
Document Type: srp
Title: ENGINEERED SAFETY FEATURES SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070560004.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.3
CFR Part: 
CFR Title: 

Content:
IEEE Std 603-1991 or IEEE Std 279-1971, depending upon the applicant/licensee’s commitment regarding these design criteria. For computer-based ESFAS, guidance is provided by IEEE Std 7-4.3.2-2003 as endorsed by Regulatory Guide 1.152, Revision 2. 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 7-4.3.2-2003. 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 7-4.3.2-2003 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. 7.3-7 Revision 5 - March 2007 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 responsding to each event discussed in