Document: NUREG-0800
Document ID: f1629507-6318-4e71-94a6-9d6664ba96a3
Document Type: srp
Title: of the plant safety analysis report (SAR).  Although NRC did not endorse the annexes of
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070660327.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.6
CFR Part: 
CFR Title: 

Content:
IEEE Std 7-4.3.2-2003 in Regulatory Guide 1.152, Revision 2, subsections in this SRP appendix address guidance from some the annexes. The criteria contained in IEEE Std 7-4.3.2-2003, in conjunction with requirements in IEEE Std 603-1991, establish minimum functional and design criteria for computers used as components of a safety system. Although intended for digital safety systems, the criteria of IEEE Std 7-4.3.2-2003 can be applied to any digital I&C system. For non-safety digital I&C systems covered by SAR Sections 7.7 and 7.8, which are systems that have a high degree of importance-to-safety based on risk, graded application of the criteria of IEEE Std 7-4.3.2-2003 could be considered by the reviewer. Data communication systems covered by SAR Section 7.9 are support systems to I&C systems. Hence, the criteria and guidance for the communication systems are the same as those for the principal I&C systems they support. The coordination review needed for each I&C system is discussed in SRP Section 7.0. 3. DEFINITIONS, ABBREVIATIONS, AND REFERENCES This SRP appendix does not provide any additional definitions or abbreviations to those that appear in IEEE Std 7-4.3.2-2003. In addition to the references listed in IEEE Std 7-4.3.2-2003, NRC staff should be familiar with national and international standards, regulatory guides, SRP branch technical positions (BTPs) and other guidance relevant to the topics under review that are identified in the discussion of the review topics below. 4. SAFETY SYSTEM DESIGN BASIS (IEEE Std 7-4.3.2-2003 Clause 4) Clause 4 of IEEE Std 603-1991 requires that the specific bases established for the design of each safety system are reviewed to determine whether they are consistent with the requirements of Clause 4 of IEEE Std 603-1991. Section 4 of SRP Appendix 7.1-C provides review guidance. 5. SAFETY SYSTEM CRITERIA (IEEE Std 7-4.3.2-2003 Clause 5) Clause 5 of IEEE Std 603-1991 requires that safety systems shall, with precision and