Document: NUREG-0800
Document ID: b9d43224-eb4e-4b19-a212-b3bb8c0ffbb5
Document Type: srp
Title: Diversity and
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070660258.pdf
Revision Date: 2023-06
Chapter: 7
Section ID: 7.9
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tem must be reviewed against the requirements of 10 CFR Part 50, as described in SRP Section 7.1 and the individual SRP sections applicable to the system under review. Certain review topics need to be considered differently for digital systems. These topics are: Appendix 7.0-A-13 Revision 5 - March 2007 • Equipment qualification, including electromagnetic compatibility. • Real-time, deterministic performance. • On-line and periodic test provisions. • Communications independence. • Control of access. Figure 7.0-A-7 of this appendix outlines the review of these topics. Detailed regulatory bases, material to be reviewed, acceptance criteria, and review processes for each of these topics are contained in SRP Sections 7.1 and 7.9, SRP Appendix 7.1-C, and SRP BTPs 7-17 and 7-21. F. Audit of Software Life-Cycle Process Implementation The applicant/licensee's implementation of life-cycle activities should be audited to confirm that the planned process is being implemented. Figure 7.0-A-8 of this appendix provides an overview of the process for auditing the implementation process. Figure 7.0-A-5 of this appendix identifies the software life-cycle process implementation topics that should be considered as candidates for audit. SRP BTP 7-14, subsection B.3.2, describes the acceptance criteria for software life-cycle process implementation. The scope and depth of the inspection should be consistent with the extent and complexity of the proposed digital system and the potential safety impact of system failure. For simple, limited, low-impact retrofits to existing systems, the process audit may be a very limited-scope "desk audit" of selected examples of process documentation. Review of extensive digital I&C systems, such as replacement of the protection and control systems, should involve detailed reviews of a wide range of software process documentation. Ideally, these reviews would occur in process audits of several of the life-cycle phases, as indicated in Figure