Document: NUREG-0800
Document ID: b3d7a8f7-62f4-4ace-b8c7-32606edaa8f5
Document Type: srp
Title: CONTROL SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1515/ML15159B161.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.7
CFR Part: 
CFR Title: 

Content:
be developed using a structured process similar to that applied to safety system software. Elements of the review process may be tailored to account for the lower safety significance of control system software. Refer to SRP Appendix 7.0-A and SRP Appendix 7.1-D for guidance on digital system review. • Independence - The independence of safety system functions from the control system should be verified. See SRP Appendix 7.1-B, Subsection 4.6, and SRP Appendix 7.1-C, Subsections 5.6 and 6.3. • Diversity and Defense-in-Depth - Control system elements credited in the diversity and defense-in-depth analysis (see BTP 7-19) should be reviewed using the criteria for diverse I&C systems described in SRP Section 7.8. • Potential for inadvertent actuation - The control systems design should limit the potential for inadvertent actuation and challenges to safety systems. • Control of access - Physical and electronic access to digital computer-based control system software and data should be controlled to prevent changes by unauthorized personnel. Control should address access via network connections and via maintenance equipment. 2. For review of a DC application, the reviewer should follow the above procedures to verify that the design, including requirements and restrictions (e.g., interface requirements and site parameters), set forth in the final safety analysis report (FSAR) meets the 7.7-7 Draft Revision 6 – August 2015 acceptance criteria. DCs have referred to the FSAR as the design control document. The reviewer should also consider the appropriateness of identified COL action items. The reviewer may identify additional COL action items; however, to ensure these COL action items are addressed during a COL application, they should be added to the DC FSAR. For review of a COL application, the scope of the review is dependent on whether the COL applicant references a DC, an early site permit or other NRC approvals (e.g., manufacturing license, site suitability